TM8000 3DK Hardware Developer’s Kit Application Manual TM8000/TM8100 TM8200 Developers Manual/TM8100 TM8100

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TM8100 mobiles
TM8200 mobiles

3DK Hardware Developer’s Kit
Application Manual

MMA-00011-01
Issue 1
March 2006

Contact Information

Intellectual Property Rights

Tait Radio Communications
Corporate Head Office
Tait Electronics Ltd
P.O. Box 1645
Christchurch
New Zealand
For the address and telephone number of regional
offices, refer to the TaitWorld website:
Website: http://www.taitworld.com

This product may be protected by one or more patents
of Tait Electronics Limited together with their
international equivalents, pending patent applications
and registered trade marks: NZ338097, NZ508054,
NZ508340, NZ508806, NZ508807, NZ509242,
NZ509640, NZ509959, NZ510496, NZ511155,
NZ511421, NZ516280/519742, NZ519118,
NZ519344, NZ520650/537902, NZ521450,
NZ524509, NZ524537, NZ524630, NZ530819,
NZ534475, NZ534692, NZ535471, NZ536945,
NZ537434, NZ534369, NZ522236, NZ524378,
AU2003281447, AU2002235062, AU2004216984,
CA2439018, EU03784706.8, EU02701829.0,
EU04714053.8, GB23865476, GB2386010,
GB0516094.0, GB0516092.4, US09/847322, US60/
613748, US60/539617, US10/520827, US10/468740,
US5,745,840, US10/520827.

Technical Support
For assistance with specific technical issues, contact
Technical Support:
E-mail: support@taitworld.com
Website: http://support.taitworld.com

Copyright and Trademarks
All information contained in this manual is the property
of Tait Electronics Limited. All rights reserved.
This manual may not, in whole or in part, be copied,
photocopied, reproduced, translated, stored, or reduced
to any electronic medium or machine-readable form,
without prior written permission from Tait Electronics
Limited.
The word TAIT and the TAIT logo are trademarks of
Tait Electronics Limited.
All trade names referenced are the service mark,
trademark or registered trademark of the respective
manufacturers.

To Our European Customers
Tait Electronics Limited is an
environmentally responsible company
which supports waste minimization
and material recovery. The European
Union’s Waste Electrical and Electronic
Equipment Directive requires that this
product be disposed of separately from the general waste
stream when its service life is over. Please be
environmentally responsible and dispose through the
original supplier, your local municipal waste “separate
collection” service, or contact Tait Electronics Limited.

Disclaimer
There are no warranties extended or granted by this
manual. Tait Electronics Limited accepts no
responsibility for damage arising from use of the
information contained in the manual or of the
equipment and software it describes. It is the
responsibility of the user to ensure that use of such
information, equipment and software complies with the
laws, rules and regulations of the applicable
jurisdictions.

Enquiries and Comments
If you have any enquiries regarding this manual, or any
comments, suggestions and notifications of errors,
please contact Technical Support.

Updates of Manual and Equipment
In the interests of improving the performance, reliability
or servicing of the equipment, Tait Electronics Limited
reserves the right to update the equipment or this
manual or both without prior notice.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Associated Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Publication Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Alert Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.2 Serial Ports - Notice to all System Integrators . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2.1 Serial Line Polarity in Tait Radios . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2.2 Line Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2.3 RS232 Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2.4 RS232 Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Description of the Radio Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1 RF Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2 Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.3 Auxiliary Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.4 Internal Options Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2.5 Provision for External Options Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.6 Provision for Additional Connector (SMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2.7 Control Head Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.8 Microphone Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.9 Blank Control Head Programming Connector . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.10 RJ45 Control Head Programming Connector . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Programmable I/O Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.1 Digital Input Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.1.1 Toggle Stand-by Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.1.2 Power Sense (Ignition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.1.3 Enter Emergency Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.1.4 Send Channel Preset Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.1.5 Send Network Preset Call 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.1.6 External Call (ECR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.1.7 External PTT 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.1.8 Inhibit PTT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.1.9 Toggle Tx RF Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3.1.10 Decrement Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.1.11 Increment Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3.1.12 Home Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
3.1.13 BCD Pin 0 to 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

3.1.14
3.1.15
3.1.16
3.1.17
3.1.18
3.1.19
3.1.20
3.1.21
3.1.22
3.1.23
3.1.24
3.1.25
3.1.26

Preset Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mute External Audio Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mute Audio Output Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unmute Audio Output Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Send Mic Audio to Spkr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Force Audio PA On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Force Audio PA Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Simulate F1 to F4 Key. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Toggle F1 to F4 Key LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Toggle Alarm Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Activate THSD Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RTS Control (DCE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lock Radio UI (PIN to unlock) . . . . . . . . . . . . . . . . . . . . . . . . . . . .

60
61
62
63
63
64
65
66
67
67
68
68
69

3.2 Digital Output Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 Busy Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 Radio Has Service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3 Radio Transmission Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4 Channel Locked Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5 Reflected PTT Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.6 External Alert 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.7 Public Address Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.8 Reflected PTT Inhibit Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.9 Reflect THSD Modem Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.10 Signalling Audio Mute Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.11 Radio On Traffic Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.12 On Data Traffic Channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.13 Monitor Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.14 Hookswitch Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.15 Call Setup Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.16 Radio Idle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.17 Control Status Rx (Line 1 to 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.18 SIBT Received . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.19 Radio Stunned . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.20 F1 to F4 Key Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.21 FFSK Data Received Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.22 CTS Control (DCE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.23 Ready For NPD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.24 Serial Data Tx In Progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.25 Radio Ready . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

70
77
77
78
79
79
80
81
81
82
82
83
83
83
83
84
84
85
86
86
87
88
89
89
89
90

3.3 Audio Tap In and Tap Out Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
4

Creating Your Own Options Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4.1 Internal Options Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4.1.1 Mechanical Envelope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
4.1.2 TM8000 Internal Options Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
4.1.3 Common Practices for Internal Options Board Design . . . . . . . . . . . 102
4.1.4 Guidelines for EMC Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
4.2 Blank Control Head Options Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Connecting Third-Party Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
5.1 External Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.1.1 External Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
5.1.2 Audio Headset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
5.1.3 USB Adaptor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
5.2 Internal Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
5.2.1 Encryption Module (Scrambler) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
5.2.2 ANI Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Connecting an External Alert Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
6.1 Fitting Power MOSFET Q707 and Removing Resistor R768 . . . . . . . . . . . . . 130
6.2 Radio Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
6.3 Connecting the External Alert Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Computer-Controlled Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
7.1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
7.1.2 Benefits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
7.1.3 Configurable Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
7.1.4 Potential Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
7.2 Programmable Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
7.2.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
7.3 Command Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
7.4 Command Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
7.4.1 Message Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
7.4.2 Calculating [CHECKSUM] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
7.5 CCR Mode Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
7.5.1 Entering CCR Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
7.5.2 CCR/CCDI Mode Independence . . . . . . . . . . . . . . . . . . . . . . . . . . 137
7.5.3 CCR Mode Activated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
7.5.4 CCR Mode Busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
7.5.5 Blocked Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
7.5.6 CCR Persistence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
7.5.7 CCR Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
7.6 CCR Positive Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
7.7 CCR Negative Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
7.7.1 Invalid CCR Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
7.7.2 Validation Checksum Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
7.7.3 Invalid Validation Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
7.7.4 Validation Parameter Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
7.7.5 Radio Busy Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
7.7.6 Command Not Accepted Message . . . . . . . . . . . . . . . . . . . . . . . . . . 140
7.8 CCR Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
7.8.1 Summary and Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
7.8.2 Go to Receive Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
7.8.3 Load Transmit Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
7.8.4 Set Volume Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
7.8.5 Receive CTCSS Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

7.8.6
7.8.7
7.8.8
7.8.9
7.8.10
7.8.11
7.8.12
7.8.13
7.8.14
7.8.15
7.8.16

Transmit CTCSS Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receive DCS Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit DCS Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Encode Selcall Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set Selcall Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set ANI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmitter Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Query Radio Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exit CCR Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

144
145
145
146
146
148
148
149
150
150
151

7.9 Unsolicited Messages from the Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.9.1 Summary and Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.9.2 PTT exceeds max transmit limit. . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.9.3 Selcall Decode Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.9.4 Notify Buffer Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

152
152
152
153
153

Tait General Software Licence Agreement . . . . . . . . . . . . . . . . . . . . . . . . . . . .155

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Preface
Scope of Manual
This manual contains a description of the radio interfaces and information
on how to integrate third-party products and create internal and control
head options boards for TM8100 and TM8200 radios.
Purchase of the 3DK Hardware Developer’s Kit entitles you to telephone
support from your regional Tait service organisation (for telephone numbers
refer to the TaitWorld website). Tait also offers the ability to log questions via
the internet using the Tait FOCUS call management system. Please contact
your local Tait service organisation for login details. The Tait FOCUS system
allows you to raise technical enquiries directly on Tait via the Internet and
view the progress of that issue through to resolution. This application allows
you to contribute to the issue resolution and also to upload and download any
required files to speed up the problem resolution process.

Disclaimer
Important

Modifications to radio-frequency transmitting equipment
can void the user's authority to operate the equipment.
By distributing the TM8000 3DK Hardware Developer’s
Kit, Tait Electronics Limited. does not accept liability for
any non-compliance or infringement of intellectual
property rights resulting from the application or use of this
kit or information. Any person modifying Tait radiofrequency transmitting equipment is responsible for
ensuring that the modified equipment meets all legal and
regulatory requirements in the country of use or supply.

Associated Documentation
The following associated documentation is available for this product:
■ MMA-00002-xx TM8100 User’s Guide
■ MMA-00003-xx TM8200 User’s Guide
■ MMA-00028-xx TM8100/TM8200 Installation Guide
■ MMA-00005-xx TM8100/TM8200 Service Manual
■ MMA-00013-xx TMAA30-02 TM8000 3DK Application Board
Service Manual
■ MMA-00014-xx TMAA30-02 TM8000 3DK Application Board
Software Manual

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

MMA-00038-xx TM8100/TM8200 Computer-Controlled Data
Interface (CCDI) Protocol Manual

■

The characters xx represent the issue number of the documentation.
Technical Note TN-1075-AN MAP27 Implementation Form
Technical Note TN-1110 USB to Serial Adaptors
Tecnical Note TN-1140 TM8000 Horn Alert Setup

■
■
■

Technical notes are published from time to time to describe applications for
Tait products, to provide technical details not included in manuals, and to
offer solutions for any problems that arise.1

Publication Record
Issue

Publication Date

March 2006

Description
1st release

Alert Notices
Within this manual, four types of alerts are given to the reader: warning,
caution, important, and note. The following paragraphs illustrate each type
of alert and its associated symbol.
Warning!! This alert is used when there is a potential risk of death
or serious injury.
Caution

This alert is used when there is the risk of minor or moderate
injury to people.

Important

Note

This alert is used to warn about the risk of equipment
damage or malfunction.

This alert is used to highlight information that is required to ensure
that procedures are performed correctly.

1. Technical notes are available in PDF format from the Tait support website.
Consult your nearest Tait Dealer or Customer Service Organization for
more information.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Abbreviations
Abbreviation

Description

3DK

Third-Party Developer’s Kit

AGND

Analog Ground

ALC

Automatic Level Control

ANI

Automatic Number Identification

AUD

Audio

AUX

Auxiliary

BCD

Binary-Coded Decimal

BIN

Binary

BNC

Bayonet Neill Concelman (RF connector)

CCDI

Computer-Controlled Data Interface

Control Head

CMOS

Complementary Metal Oxide Semiconductor

COM

Communication (Port)

CTS

Clear to Send

DGND

Digital Ground

DSP

Digital Signal Processor

DTE

Data Terminal Equipment

EMC

Electromagnetic Compatibility

ESD

Electrostatic Discharge

ESR

Equivalent Series Resistance

FFSK

Fast Frequency Shift Keying

GND

Ground

GPIO

General Purpose Input/Output

GPS

Global Positioning System

I/O

Input/Output

IOP

Internal Options Port

IPN

Internal Part Number

LED

Light-Emitting Diode

LK1…LK4

Hardware Link 1…4

LSB

Least Significant Bit

Medium Band

MIC

Microphone

N/A

Not Applicable

Narrow Band

NMEA

National Marine Electronics Association

OTAR

Over-the-Air Rekeying

Power Amplifier

PCB

Printed Circuit Board

PRG

Program

PSU

Power Supply Unit

PTT

Press To Talk

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Abbreviation
RF

Description
Radio Frequency

RSD

Rated System Deviation

RSSI

Received Signal Strength Indicator

RTS

Request to Send

Receive

RXD

Receive Data

S/N

Signal/Noise

SCADA

Supervisory Control and Data Acquisition

SDM

Short Data Message

SMD

Surface-Mounted Device

SPK

Speaker

THSD

Tait High Speed Data

TTL

Transistor-Transistor Logic

Transmit

TXD

Transmit Data

UART

Universal Asynchronous Receiver/Transmitter

USB

Universal Serial Bus

Wide Band

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Introduction

1.1

Overview
This manual provides you with the information required to:
■

■

interface to the radio and configure the programmable I/O lines:
■

“Description of the Radio Interfaces” on page 13

■

“Programmable I/O Lines” on page 39

build your own options boards:
■

■

interface application devices:
■

“Description of the Radio Interfaces” on page 13

■

“Programmable I/O Lines” on page 39

■

“Connecting Third-Party Products” on page 109

connect an external alarm to the radio:
■

■

“Creating Your Own Options Board” on page 97

“Connecting an External Alert Device” on page 129

use Computer-Controlled Radio (CCR) commands to control a radio
unit from Data Terminal Equipment:
■

“Computer-Controlled Radio” on page 133

Refer to the technical support website for the latest information on the
integration of application devices (refer to “Tait Radio Communications
Corporate Head Office” on page 2).

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Introduction

1.2

Serial Ports - Notice to all System Integrators

1.2.1

Serial Line Polarity in Tait Radios
The serial lines in all Tait radios are negative logic.
This means that a logic high is 0V and a logic low is 3V3, which is the same
polarity as RS232, and is opposite to TTL/CMOS. No negative voltage is
provided on these lines.

1.2.2

Line Lengths
The voltage levels in Tait radios are low and have been designed to drive
limited cable lengths.
It is not recommended that a radio drive any line longer than 3.0m.

1.2.3

RS232 Compatibility
Although the serial port TXD line only changes from 0V to +3V3, it will
drive most modern RS232 receivers satisfactorily, providing the cable length
used is within the limit specified above.
The RXD input is capable of accepting signals up to the full RS232 levels.

1.2.4

RS232 Drivers
If full RS232 drive levels are required, or longer cable lengths are used, the
TMAA01-05 Options-Extender Board should be fitted to the radio.

Introduction

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces
This chapter describes the characteristics of the mechanical and electrical
interfaces of the radio body and the various control heads that are suitable
for the connection of TM8100/TM8200 or application accessories and
equipment.
Figure 2.1 provides an overview of the radio interfaces:

Figure 2.1

Radio interfaces (with TM8115 control head)

Control Head

Radio Body

Control-Head
Board

Main Board

Volume
Control

Microphone
Connector

RF Connector

Keys

ControlHead
Loom

Power
Connector

Control-Head
Connector

LCD

LEDs

Speaker

Auxiliary
Connector
Iinternal
Options
Connector

Speaker
Connector

Speaker
Leads

Debug
Connector
(Factory Only)

Internal
Options
Loom
Internal
Options
Board

External
Options
Connector

Figure 2.2 shows the connectors of the radio body.
Figure 2.3 shows the connectors of the TM8115 two-digit display control
head. (The TM8110 one-digit display control head is the same as this,
except that the LED display is only one digit wide.)
Figure 2.4 shows the connectors of the TM8105 blank control head.
Figure 2.5 shows the connectors of the TM8255 graphical-display control
head.
Figure 2.6 shows the connectors of the TM8252 RJ45 control head.
For more block and circuit diagrams refer to the PCB information for your
radio.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Figure 2.2

Connectors of the radio body

front view

control head
connector
provision for
external options
connector

auxiliary
connector

provision for
additional
connector

power
connector

RF
connector

rear view

internal options
connector

top view

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Figure 2.3

Connectors of the TM8115 two-digit display control head

front view

microphone
connector

to control head
connector

rear view

Figure 2.4

Connectors of the TM8105 blank control head

front view

programming
connector
to control head
connector

rear view

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Figure 2.5

Connectors of the TM8200 graphical-display control head

front view

microphone
connector

to control head
connector

rear view

Figure 2.6

Connectors of the TM8252 RJ45 control head

programming
connector

LED

front view

to control head
connector

rear view

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

2.1

RF Connector
The RF connector is the primary RF interface to the antenna. The RF
connector is either a standard BNC, or mini-UHF, or TNC socket with an
impedance of 50Ω.
Important

Table 2.1

The maximum RF input level is +27dBm. Higher levels
may damage the radio.

RF connector - pins and signals

Pinout

Signal Name

Signal Type

RF analog

GND

RF ground

rear view

2.2

Power Connector
The power connector is the interface for the primary 13.8V power source
and the external speaker. The primary power source can be the vehicle
battery or a mains-fed DC power supply. The power connector provides
connection for an external speaker.

Table 2.2

Power connector - pins and signals

Pinout

Signal name
AGND

Earth return for radio body
power source.

Ground

SPK–

External speaker output.
Balanced load configuration.

Analog

SPK+

External speaker output.
Balanced load configuration.

Analog

13V8_BATT

DC power input for radio body
and control head.

Power

25W
1

Signal type

50W/40W

external view

Description

external view

Warning!!

Danger of Fire! The protection mechanisms in
Table 2.3 rely on the correct fuses in both the
negative and positive power supply leads being
present. Failure to fit the correct fuses may
result in fire or damage to the radio.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Table 2.3

Power connector - power supply input characteristics
Standard

Parameter

Test method and conditions
min.

Radio operating range12

typ.

max.

9.7

17.2

10.2

16.8

After supply voltage excursion
outside the radio operating
range

Safe input range23

–0.5

No hardware damage.

Reverse polarity
protection

Crowbar diode with in-line
fuse

Cranking earth current
protection

In-line fuse with negative lead

Auto-recovery limits

Comments

units

Refer to the Service Manual
for details on replacing
fuses.

1. While the transceiver will operate over this range RF performance to specification applies over 10.8 to 16.0V.
2. Outside the radio operating range the radio will shutdown. Auto recovery will occur if the supply voltage returns
to within the auto recovery limits specified. Depending on the power sense option selected, auto recovery may not
occur if supply voltage drops below 4V prior to returning to within the auto recovery limits.
3. Application of steady state voltage higher than 30V will cause the crowbar diode (D600) to fail short circuit and
in-line fuse to blow. The radio will survive transients above 30V within the 95/54/EC standard.

Important

Table 2.4

The speaker load configuration is balanced; the speaker
output lines must not be connected to ground. Connecting
a speaker output line to ground will cause audio power
amplifier shutdown

Power connector - speaker output characteristics
Standard

Parameter

Test method and conditions
min.

Load configuration

Balanced

Load

3.2

Maximum power

Rated duty cycle
Rated audio power

typ.

max.

Ω

33
3

Comments

units

Into 4Ω.

1min at maximum power:
2min Rx standby

Into 16Ω via external speaker
This is ‘rated audio power’ for
the purposes of all external
port.
Internal speaker is disconnected. standards.

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

2.3

Auxiliary Connector
The auxiliary connector is the standard interface for external devices that are
typically connected to a radio. The auxiliary connector is a 15-way standarddensity D-range socket. The auxiliary connector provides a serial port, three
programmable input lines, four programmable digital I/O lines and audio
I/O.
Note

The space for a mating plug is limited to 41mm in width and
18mm in height. Although most plugs will fit this space, it is recommended to test the plug to be used before manufacturing a
cable. The internal options kit (described on page 101) includes a
suitable plug (Tait IPN 240-00020-55).

If the auxiliary cable is longer than 1 metre it is recommended that the cable
and connector backshell be shielded. Figure 2.7 shows the recommended
shielding arrangement. The earth braid wire (bare copper) and aluminium
foil should only be earthed at the radio end of the cable.
Figure 2.7

Recommended auxiliary cable and connector shielding

metal D-range shroud in
contact with backshell
metal backshell
signal earth wire
cable insulation

aluminium foil
metal cable clamp
earth braid wire
analogue ground pin

The I/O lines can be programmed for a variety of functions, logic levels, and
in some cases, direction (refer to “Programmable I/O Lines” on page 39).
Audio lines can also be programmed to tap into, or out of, different points in
the audio processing chain (refer to “Audio Tap In and Tap Out Lines” on
page 91).

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Table 2.5

Auxiliary connector - pins and signals

Pinout

B
C
D
E
F
G
H
I

J
1)
1!
1@
1#
1$
1%

rear view

Signal name

Description

Signal type

AUX_GPI1

General purpose digital input.
Programmable function.

Digital, 3V3 CMOS

AUX_GPI2

General purpose digital input.
Programmable function.
With LK3 fitted, GPI2 is an
emergency power sense input.1

Digital, 3V3 CMOS

AUX_GPI3

General purpose digital input.
Programmable function.
With LK2 fitted, GPI3 is a power
sense input.1

Digital, 3V3 CMOS

AUX_GPIO4

AUX_GPIO5

AUX_GPIO6

Programmable function and
direction.
Pads available to fit a higher power
driver transistor on GPIO4 line.2

Digital, 3V3 CMOS
input; open collector
output with pullup

AUX_GPIO7

AUX_TXD

Asynchronous serial port Transmit data

Digital, 3V3 CMOS

AUX_RXD

Asynchronous serial port Receive data

Digital, 3V3 CMOS

AUD_TAP_IN

Programmable tap point into the Rx
or Tx audio chain. DC-coupled.

Analog

AUD_TAP_OUT

Programmable tap point out of the
Rx or Tx audio chain. DC-coupled.

Analog

AUX_MIC_AUD Auxiliary microphone input.
Electret microphone biasing
provided. Dynamic microphones are
not supported.

Analog

RSSI

Analog RSSI output.

Analog

+13V8_SW3

Switched 13.8V supply. Supply is
switched off when radio body is
switched off.

Power

AGND

Analog ground

Ground

1. For more information on hardware links refer to the Service Manual.
2. For more information on high power drive refer to “Special Purpose Outputs” on page 73.
3. Can be switched or unswitched. For more information refer to the Service Manual.

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Table 2.6

Auxiliary connector - DC characteristics
Standard

Parameter

Test method and conditions
min.

typ.

max.

Comments

units

Digital signals
Input low level:
All inputs
AUX_GPI2

0.7
Vs–4

V
V

No hardware links fitted1.
LK3 fitted.

Includes AUX_GPI3 with LK1/2 fitted.
Configured as emergency power sense
input.

Input high level:
All inputs
AUX_GPI2

1.7
Vs–1.5

V
V

No hardware links fitted1.
LK3 fitted.

AUX_GPI3

2.6

LK1 and/or 2 fitted.

µA
mA
µA
mA

No links fitted1. Default pullups3. Default pullup resistance is 33kΩ.
LK3 fitted. Vs=13.8V
Configured as emerg. power sense input.
Configured as power sense input.
LK1 and 2 fitted.
–8V input.

1
10
100

mA
µA
µA

No links fitted1. Default pullups3. Default pullup resistance is 33kΩ.
+8V input.
3.3V input.
5V input.

50
600
200

mV
mV
mV

100µA sink current.
10mA sink current.
100µA sink current.

V
V

No load. Default pullups3.
3kΩ load.

Input low current:
All other inputs
AUX_GPI2
AUX_GPI3
AUX_RXD

–100 –120
–132
–500
–1

Input high current:
AUX_RXD
All other inputs
Output low level:
AUX_GPIO4-7
AUX_TXD

Configured as emergency power sense
input.
Configured as power sense input.

Current limit occurs at 20mA typ.

Output high level:
AUX_GPIO4-7
AUX_TXD

3.1
2.4

Safe DC input limits:
AUX_GPI1-3
AUX_GPIO4-7
AUX_RXD
AUX_TXD4

–0.5
–0.5
–25V
–10

Vs+0.5
Vs+0.5
Vs+0.5
Vs+0.5

V
V
V
V

DC output range:
RSSI
13V8_SW

0
9.7

3
17.2

V
V

See Table 2.9 on page 23.
Follows Vs.

DC bias:
AUD_TAP_IN
AUD_TAP_OUT
AUX_MIC_AUD

1.4
2.1
2.9

1.5
2.3
3.0

1.6
2.5
3.1

V
V
V

No load. Zero Rx frequency error.
Via 2.2kΩ.
Bias for electret microphone.

Input impedance:
AUD_TAP_IN
AUX_MIC_AUD

50
2.1

100
2.2

150
2.3

kΩ
kΩ

DC to 10kHz

Output impedance:
AUD_TAP_OUT
RSSI

590
950

600 650
1000 1050

Ω
Ω

DC to 10kHz

Safe DC input limits:
AUD_TAP_IN
AUD_TAP_OUT4
AUX_MIC_AUD
RSSI4

–17
–0.5
–17
–17

Input current must not exceed ± 50mA.
This is the rating of the clamping
diodes.

Analog signals

Output load:
13V8_SW (switched)
13V8_SW (switched)
13V8_SW (unswitched)
13V8_SW (unswitched)

+17
+17
+17
+17

V
V
V
V

1
2
1
2

A
A
A
A

Output switches off outside this range.

Short circuit-safe. Input current <±20mA

Continuous load
Peak for <1sec
Continuous load
Peak for <1sec

Specification must be derated by the
load amount drawn from the control
head and internal options interfaces

1. For more information on hardware links refer to the service manual.
2. It is recommended that this input is driven by a mechanical switch or an open collector/drain output.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

3. For more information on pullups refer to “Digital Input Lines” on page 39.
4. These outputs are protected against accidental input to the limits specified.

Table 2.7

Auxiliary connector - AC characteristics
Standard

Parameter
min.

typ.

max.

units

Test method and
conditions

Comments

AUD_TAP_IN (refer to note 4)
Nominal input level:
Tap T3, T4, T5, T8, T9, T12
Tap T13
Tap R7, R10

0.62
0.78
0.62

Full scale input level
Frequency response:
All tap-points

0.69
0.87
0.69

0.76
0.96
0.76

2.0

Vp-p
Vp-p
Vp-p

Level for 60% RSD@1kHz.
Level for 3kHz dev.@1kHz.
Refer to note 3.

Equivalent to –10dBm into
600Ω.

Vp-p

Refer to the plots in
Table 2.10 and Table 2.11.

Group delay - absolute:
Tap T13
Tap T12
Tap T9
Tap T8
Tap T5
Tap T4
Tap T3

1.8
1.8
6.6
9.6
11.6
11.7
11.7

Group delay - distortion:
Tap T12 and Tap T13

Refer to the plots in
Table 2.12.

At 1kHz. Refer to note 2.
ms
ms
ms
ms
ms
ms
ms

Refer to note 1.
Refer to note 1.

AUD_TAP_OUT
Nominal output level:
All Rx tap-points except R1
Tap R1
Tap T3

0.62
0.54
0.62

Full scale output level
Frequency response:
All tap-points

0.69
0.60
0.69

0.76
0.66
0.76

2.0

Vp-p
Vp-p
Vp-p

Rload=600Ω.
Level at 60% RSD@1kHz.
Level at 3kHz dev.@1kHz
Refer to “Microphone
sensitivity”of AUX_MIC_AUD.

Vp-p

Rload=600Ω.

Equivalent to –10dBm into
600Ω.

Refer to the plots in
Table 2.10 and Table 2.11.

Group delay - absolute:
Tap R1
Tap R2
Tap R4
Tap R5
Tap R7
Tap R10

1.8
1.8
6.6
6.7
8.5
8.7

Group delay - distortion:
Tap R1 and Tap R2

Refer to the plots in
Table 2.12.

At 1kHz. Refer to note 2.
ms
ms
ms
ms
ms
ms

Refer to note 1.

AUX_MIC_AUD
Rated System Deviation
NB
MB
WB

–2.5
–4.0
–5.0

Modulation frequency
response

Refer to the plot in
Table 2.13.

Microphone sensitivity

6.0

EIA-603B
+2.5
+4.0
+5.0

7.5

9.0

Description of the Radio Interfaces

kHz
kHz
kHz

Units are peak frequency
deviation from nominal
carrier frequency in kHz.
EIA-603B

mV
rms

EIA-603B

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Table 2.7 Notes:
1. Optional processing blocks are bypassed in the above specification.
2. For AUD_TAP_IN and AUD_TAP_OUT specifications the following signal paths apply:
Case

Input

Tap into Rx chain

Output

AUD_TAP_IN

RX_AUD

Tap out of Rx chain

Modulation at antenna

AUD_TAP_OUT

Tap into Tx chain

AUD_TAP_IN

Modulation at antenna

Tap out of Tx chain

AUX_MIC_AUD

AUD_TAP_OUT

3. For tap into the Rx path, nominal level refers to the level required to give output at RX_AUD that is same as the
60% dev level from the receiver. The level specified applies at 1kHz only.
4. AUD_TAP_IN uses a DC-coupled analog-to-digital converter and the bias voltage specified in Table 2.6 should be
used to maximise dynamic range. The DC bias is removed internally by a digital high-pass filter so the Tx carrier
frequency will not be affected by any bias error. it is recommended to use external AC-coupling for applications
which do not require modulation to very low frequencies.

Table 2.8

Auxiliary connector - data characteristics
Standard

Parameter

Test method and conditions
min.

typ.

max.

Comments

units

Serial port
Baud rate:

1200, 2400, 4800,
9600, 14400, 19200,
28800

Data bits:

Start bit:

Stop bit:

Parity:

None

Protocol:

CCDI3

Flow control:
Software

XON/XOFF

bit/s

All UART parameters are fixed
and common to all UARTs
except for the baud rate
which is configurable and
different for different modes/
applications

GPIO
Delays:
I/O mirror to IOP
UI key delay

Table 2.9

500
50

µs
ms

RSSI voltage vs. signal strength

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Table 2.10 Rx path tap frequency response plots
Tap out R1

Tap out R2

0
-3

Narrow band
Medium band
Wide band

-6
-9

dB (ref 1kHz, 60% dev)

-3

-12
-15
-18
-21
-24
-27

Narrow band
Medium band
Wide band

-6
-9
-12
-15
-18
-21
-24
-27

-30

-30
1

100

1000

Frequency (Hz)

10000

100

-3

dB (ref 1kHz, 60% dev)

-6
-9
-12
-15
-18
-21
-24
-27

CTCSS off
CTCSS on

-6
-9
-12
-15
-18
-21
-24
-27

-30

-30
1

100

1000

Frequency (Hz)

10000

100

3
CTCSS off
CTCSS on

0
-3

Frequency (Hz)

1000

10000

1000

10000

1000

10000

Tap out R10

dB (ref 1kHz, 60% dev)

Tap out R7

-6
-9
-12
-15

-18

3
CTCSS off
CTCSS on

0
-3
-6
-9
-12
-15

-18

-21

-24

-21

-24

-27

-30

-30
10

100

Frequency (Hz)

1000

10000

100

Tap in R7

Frequency (Hz)

Tap in R10

-3

-6

-9

dB (ref 1kHz)

10000

Tap out R5

Tap out R4
3

-12
-15
-18
-21

-9
-12
-15
-18
-21

-24

-27

-30

-30
10

100

Frequency (Hz)

Note

1000

Frequency (Hz)

1000

10000

100

Frequency (Hz)

Audio response output is based on testing at 60% deviation.

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Table 2.11 Tx path tap frequency response plots
Tap in T13

Tap in T12
3

-3

dB (ref 1kHz, 60% dev)

-6
-9
-12
-15
-18
-21
-24
-27

-30

-30
1

100

1000

Frequency (Hz)

10000

100

Frequency (Hz)

T9
Tap in T8
0

-3

dB (ref 1kHz, 60% dev)

1000

10000

-6
-9
-12
-15
-18
-21
-24
-27

-30

-30
1

100

1000

Frequency (Hz)

10000

Tap in T5 (sub-limiting)

100

Frequency (Hz)

Tap in T5 (limiting)

dB (ref 1kHz, 120% dev)

dB (ref 1kHz, 30% dev)

10000

Tap in T8

3
0
-3
-6
-9
-12
-15

-18
-21

-24

-3
-6
-9
-12
-15
-18
-21
-24
-27

-27

-30

-30
10

100

Frequency (Hz)

1000

10000

Tap in T4 (sub-limiting)

100

Frequency (Hz)

1000

10000

Tap in T4 (limiting)

dB (ref 1kHz, 120% dev)

dB (ref 1kHz, 30% dev)

1000

3
0
-3
-6
-9
-12
-15

-18
-21

-24

-3
-6
-9
-12
-15
-18
-21
-24
-27

-27

-30

-30
10

100

Frequency (Hz)

1000

10000

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

100

Frequency (Hz)

1000

Description of the Radio Interfaces

10000

Table 2.11 Tx path tap frequency response plots (Continued)
Tap in T3 (sub-limiting)

Tap in T3 (limiting)

dB (ref 1kHz, 120% dev)

dB (ref 1kHz, 30% dev)

6
3
0
-3
-6
-9
-12
-15

-18
-21

-24

-3
-6
-9
-12
-15
-18
-21
-24
-27

-27

-30

-30
10

100

1000

Frequency (Hz)

10000

100

Tap out T3

1000

10000

1000

10000

Tap out T4

-3

-6

dB (ref 1kHz)

Frequency (Hz)

-9
-12
-15
-18
-21

-24

-27

-30

-30
10

100

1000

Frequency (Hz)

10000

100

Frequency (Hz)

Table 2.12 Group delay distortion frequency response plots
Tap in T12 or T13

Tap in R1 or R2
80

500
450
400
350
300
250
200
150
100
50
0
-50
-100
-150
-200
-250
-300
-350
-400
-450
-500

Group delay distortion (µs)

100
Narrow band
Medium band
Wide band

60
40
20
0
-20
-40
-60
-80

-100
1

100

Frequency (Hz)

1000

10000

100

Frequency (Hz)

1000

10000

Table 2.13 AUX_MIC_AUD frequency response plot
AUX_MIC_AUD

dB (ref 1kHz, 60% dev)

12
9
6
3
0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
10

No CTCSS

100

Frequency (Hz)

1000

Description of the Radio Interfaces

10000

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

2.4

Internal Options Connector
When installing an internal options board, the internal options connector is
the electrical interface to the main board of the radio body.
The internal options connector provides similar I/O to the auxiliary
connector. The digital signals and the serial port are independent of the
auxiliary connector signals, but the AUD_TAP_IN, AUD_TAP_OUT,
AUX_MIC_AUD, and RSSI signals are shared with the auxiliary connector.
The internal options connector is an 18-pin 0.1in pitch Micro-MaTch
connector.
Examples of internal options boards:
■

TMAA30-02 3DK Application Board.
Refer to the TM8000 3DK Application Board Service Manual.

■

TMAA01-01 Line-Interface Board.
Refer to the TM8100/TM8200 Service Manual.

■

TMAA01-05 Options Extender Board.
Refer to the TM8100/TM8200 Service Manual.

For information on how to create your own internal options board, refer to
“Internal Options Board” on page 97.
Table 2.14 Internal options connector - pins and signals

Pinout

Signal

Description

Signal type

13V8_SW1

Switched 13V8 supply. Supply is switched Power
off when the Radio Body is switched off.

CB
ED
GF
IH
1)J
1@1!
1$1#
1^1%
1*1&

AUD_TAP_OUT

Programmable tap point out of the Rx or
Tx audio chain. DC-coupled.

Analog

AGND

Analog ground.

Ground

AUX_MIC_AUD Auxiliary microphone input.
Electret microphone biasing provided.
Dynamic microphones are not supported.

Analog

top view

RX_BEEP_IN

Receive sidetone input. AC-coupled.

Analog

AUD_TAP_IN

Programmable tap point into the Rx or Tx Analog
audio chain. DC-coupled.

RX_AUD

Receive audio output. Post volume
control. AC-coupled.

Analog

RSSI

Analog RSSI output.

Analog

Programmable function and direction.
With LK4 fitted, GPIO7 is a power sense
input2.

Digital.
3V3 CMOS

9…15 IOP_GPIO1…7

DGND

Digital ground.

Ground

IOP_RXD

Asynchronous serial port - Receive data.

Digital.
3V3 CMOS

IOP_TXD

Asynchronous serial port - Transmit data.

Digital.
3V3 CMOS

1. Can be switched or unswitched. For more information refer to the service manual.
2. For more information on hardware links refer to the service manual.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Important

The digital I/O signals are intended to interface directly
with compatible logic signals only. Do not connect these
signals to external devices without appropriate signal conditioning and ESD protection.

Table 2.15 Internal options connector - DC characteristics
Standard
Parameter

Test method and conditions
min.

typ.

max.

Comments

units

Digital signals
Input low level:
All inputs

No hardware links fitted1.

V
V

No hardware links fitted.
LK4 fitted1.

–120

µA

No hardware links fitted1.

IOP_GPIO7

10
1500
250

µA
µA
µA

3.3V input.
5V input.
3.3V input. LK4 fitted1.

Configured as power sense input.

Output low level:
All outputs

120

100µA sink current.

1kΩ series R on all outputs.

100µA source current.

1kΩ series R on all outputs.

Input high level:
All inputs
IOP_GPIO7

0.7

1.7
2.8

Input low current:
All inputs

–100

Input high current:
All inputs

Output high level:
All outputs

3.1

Safe DC input limits:
All inputs/outputs

–0.5

+5.5

Also applies to IOP_GPIO7 with
LK4 fitted.

Configured as power sense input.
Also applies to IOP_GPIO7 with
LK4 fitted.

Input current must not exceed
±10mA.

Analog signals (for signals not listed here refer to the auxiliary connector specification)
Safe DC input limits:
RX_AUD
RX_BEEP_IN

–17
–17

Output load:
13V8_SW (switched)
13V8_SW (switched)
13V8_SW (unswitched)
13V8_SW (unswitched)

+7
+17

V
V

1
2
1
2

A
A
A
A

Continuous load
Peak for <1sec
Continuous load
Peak for <1sec

Specification must be derated by
the load amount drawn from the
control head and auxiliary
interfaces. See Service Manual.

1. For more information on hardware links refer to the service manual.

Table 2.16 Internal options connector - AC characteristics
Standard
Parameter

Test method and conditions
min.

typ.

max.

Comments

units

RX_BEEP_IN
Nominal input level

0.76

Full scale input level

2.5

Frequency response

0.3 to 3kHz

Input impedance

Vp-p

For 6.2Vp-p at speaker @1kHz.

Vp-p

For onset of clipping at 13.8V.

Level for 10dB below rated
power.

–3dB with respect to level at 1kHz.
kΩ

DC–10kHz

Vp-p

At 1kHz, 60% dev. Full volume

RX_AUD
Nominal output level

1.0

Full scale output level:

2.0

Vp-p

At 1kHz, 120% dev. Full volume

Output impedance:

100

Ω

At 1kHz.

Frequency response:

Refer to plot in Table 2.18.

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Table 2.17 Internal options connector - data characteristics
Standard
Parameter

Test method and conditions
min.

typ.

max.

Comments

units

Serial port
Baud rate:

1200, 2400, 4800,
9600, 14400, 19200,
28800

Data bits:

Start bit:

Stop bit:

Parity:

None

Protocol:

CCDI3

Flow control:
Software

XON/XOFF

bit/s

All UART parameters are
fixed and common to all
UARTs except for the baud
rate which is configurable
and different for different
modes/applications

GPIO
Delays:
I/O mirror to AUX
UI key delay

500
50

µs
ms

Table 2.18 RX_AUD frequency response plot
RX_AUD
9
6

dB (ref 1kHz, 60% dev)

3
CTCSS off
CTCSS on

0
-3
-6
-9
-12
-15
-18
-21
-24
-27
-30
10

100

Frequency (Hz)

1000

10000

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

2.5

Provision for External Options Connector
The radio has a mechanical interface for the external connector of an
internal options board. This external options connector can be a 9-way
standard-density or 15-way high-density D-range connector. If no internal
options board is installed (standard configuration), the hole for the external
options connector is sealed by a bung.
Examples of internal options boards:
■

TMAA30-02 3DK Application Board.
Refer to the TM8000 3DK Application Board Service Manual.

■

TMAA01-01 Line-Interface Board.
Refer to the TM8100/TM8200 Service Manual.

■

TMAA01-05 Options Extender Board.
Refer to the TM8100/TM8200 Service Manual.

For information on how to create your own internal options board, refer to
“Internal Options Board” on page 97.

2.6

Provision for Additional Connector (SMA)
The radio has a provision to fit an additional round connector or cable exit
next to the external options connector on the rear of the radio. The position
is indicated in Figure 2.2 on page 14. The maximum hole diameter is
7.5mm, suitable for an SMA connector or a cable grommet.
Important

When fitting an additional connector, it is the integrator’s
sole responsibility to provide adequate sealing.

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

2.7

Control Head Connector
The control head connector is the standard interface between the radio body
and the TM8100 and TM8200 control heads.
You can integrate your own options board into the cavity between the radio
body and the TM8105 blank control head. For information on how to
create your own blank control head options board, refer to “Blank Control
Head Options Board” on page 107.
The one-digit, two-digit, RJ45, and graphical-display control heads use all
18 signals of the control head connector, whilst the programming connector
of the blank control head only uses the signals 1 to 9.

Table 2.19 Control head connector - pins and signals

Pinout

CEGI1)1@1$1^1*
BDFHJ1!1#1%1&

Signal

RX_AUD

Receive audio output. Post volume
control. AC-coupled.

Analog

+13V81

Power supply output from radio body
power source.

Power

CH_TXD

Asynchronous serial port Transmit data.

Digital. 3V3 CMOS.

CH_PTT

PTT input from microphone. Also carries Digital
the hookswitch signal.

CH_MIC_AUD Fist microphone audio input.

Analog

AGND

Analog ground.

Ground

CH_RXD

Asynchronous serial port - Receive data. Digital. 3V3 CMOS.

DGND

Digital ground.

CH_ON_OFF

Hardware power on/software-controlled Digital
power off input. Active low.

VOL_WIP_DC

DC signal from volume pot wiper.

Analog

CH_SPI_DO

Data output signal to control head.

Digital. 3V3 CMOS.

CH_LE

Latch enable output to control head.

Digital. 3V3 CMOS.

CH_GPIO1

General purpose digital input/output.

Digital. 3V3 CMOS
input. Open collector
output with pullup.

+3V3

Power supply to control head digital
circuits.

Power

CH_SPI_DI

Data input from control head.

Digital. 3V3 CMOS.

CH_SPI_CLK

Clock output to control head.

Digital. 3V3 CMOS.

SPK–

Speaker audio output for non-remote
control head. Balanced load
configuration.

Analog

SPK+

Speaker audio output for non-remote
control head. Balanced load
configuration.

Analog

front view

Description

Signal type

Ground

1. Can be switched or unswitched. For more information refer to the service manual.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Table 2.20 Control head connector - DC characteristics
Standard
Parameter
min.

typ.

max.

units

Test method and
conditions

Comments

Digital signals
Input low level:
CH_SPI_DI
CH_RXD
CH_GPIO1
CH_PTT
CH_ON_OFF
Input high level:
CH_SPI_DI
CH_RXD
CH_GPIO1
CH_PTT
CH_ON_OFF

0.7
0.7
0.7
0.7
Vs–4

V
V
V
V
V
V
V
V
V
V

1.7
1.7
1.7
1.7
Vs–1.5

Input low current:
CH_SPI_DI
CH_RXD
CH_GPIO1
CH_PTT
CH_ON_OFF

10
–1
–120
–800
–13

µA
mA
µA
µA
mA

Vs=13.8V

Input high current:
CH_SPI_DI
CH_RXD
CH_GPIO1
CH_PTT
CH_ON_OFF

10
1
10
10
10

µA
mA
µA
µA
µA

Vin=3.3V
Vin=8V
Vin=3.3V
Vin=3.3V
Vin=Vs

Output low level:
All outputs except
CH_GPIO1
CH_GPIO1

200
50
600

mV
mV
mV

100µA sink current
100µA sink current
10mA sink current

Current limit occurs at 20mA typ.

100µA source current
3kΩ load
No load

33kΩ pullup to 3.3V.

Output high level:
All outputs except
CH_TXD
CH_GPIO1

3.1
2.4
3.1

Vin=–8V

Hookswitch resistance:
CH_PTT
5.6

13.2

kΩ

Microphone on hook resistance.

Safe DC input limits:
CH_SPI_X
CH_LE
CH_TXD
CH_RXD
CH_GPIO1
CH_PTT
CH_ON_OFF

+4.1
+4.1
Vs+0.5
Vs+0.5
Vs+0.5
+17
Vs+0.5

V
V
V
V
V
V
V

Iin must not exceed ±10mA.
Iin must not exceed ±10mA.
Iin must not exceed +50/–10mA.
Iin must not exceed +50mA.
Iin must not exceed ±50mA.

–0.5
–0.5
–10
–25
–0.5
–17
–0.5

Description of the Radio Interfaces

Iin must not exceed ±50mA.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Table 2.20 Control head connector - DC characteristics (Continued)
Standard
Parameter
min.

typ.

max.

units

Test method and
conditions

Comments

Analog signals (for signals not listed here refer to the Auxiliary interface specification)
DC input range:
VOL_WIP_DC

0
0

DC bias:
SPK+/–
CH_MIC_AUD

2.9

Input resistance:
CH_MIC_AUD

2.1

V
kΩ

Voltage/resistance for min/
max volume respectively.

This line is used for control head
detection. An open-circuit input
is considered as no head fitted.

3.1

V
V

Audio PA on.
Via 2.2kΩ

Bias for electret microphone.

2.3

kΩ

0.5Vs

Output resistance:
SPK+/–

2.2

Ω

Audio PA on.

100
1
2
1
2

mA
A
A
A
A

Continuous load
Peak for <1sec
Continuous load
Peak for <1sec

+17
+17
+17
+17

V
V
V
V

0.5

Output load:
+3V3
+13V8 (switched)
+13V8 (switched)
+13V8 (unswitched)
+13V8 (unswitched)
Safe DC input limits:
VOL_WIP_DC
RX_AUD
SPK+/–
CH_MIC_AUD

1.2
10

–17
–10
0
–0.5

Specification must be derated by
load amount from internal
options and auxiliary interfaces.
See Service Manual.1

Short circuit-safe.
With TM811x head connected,
max input via mic interface is
Vs+0.5V.

1. The TM8255 graphical-display control head can draw 1A continuous load.

Table 2.21 Control head connector - AC characteristics
Standard
Parameter

Test method and conditions
min.

typ.

max.

Comments

units

RX_AUD

refer to Table 2.16

CH_MIC_AUD

refer to AUX_MIC_AUD in
Table 2.7

SPK+/–

refer to Table 2.22

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

Table 2.22 Control head connector - speaker output characteristics
Standard
Parameter

Test method and conditions
min.

typ.

max.

Comments

units

Mute ratio

Receive audio
frequency response

Refer to plot in Table 2.24.

With respect to maximum
Signal path muted. Audio PA
output power. Noise measured in on.
0.3-3kHz bandwidth.
EIA-603B

Internal speaker output:
Load configuration

Balanced

Load

12.8

Maximum power

Rated duty cycle

Ω

At 1kHz.

Into 16Ω.

100

At maximum power.

1min at maximum power
2min Rx standby

19.2

Concurrent speaker
output:
Rated duty cycle

The internal and external
speaker loads are connected
in parallel (not switched).

Table 2.23 Control head connector - data characteristics
Standard
Parameter

Test method and conditions
min.

typ.

max.

Comments

units

Serial port
Baud rate:

1200, 2400, 4800,
9600, 14400,
19200,28800

Data bits:

Start bit:

Stop bit:

Parity:

None

Protocol:

RPI
CCDI3

Flow control:
Software

bit/s

All UART parameters are fixed
and common to all UARTs
except for the baud rate
which is configurable and
different for different modes/
applications

XON/XOFF

GPIO
Delays:
I/O mirror to IOP
UI key delay

500
50

µs
ms

Table 2.24 Speaker frequency response plot

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

The radios detect the presence or absence of a control head and
automatically configure the default receive audio volume accordingly. If a
control head with a user interface is connected, either in local or remote
configuration, then the volume potentiometer setting will determine
receive audio level. If a blank control head is connected, or no control head
is used at all, then the receive audio level will default to the programmed
Minimum Volume Level

Detection of
Control Head

For operation with the TM8105 blank control head or TM8252 RJ45
control head, the radio must be programmed always to power up when
power is applied and the ignition-sense hardware link LK1 must be fitted.
For more information on hardware links refer to the service manual.

2.8

Microphone Connector
The microphone connector of the control heads with user interface is an
RJ-45 socket.
When one of these control heads is connected to the control head connector
of the radio body using the loom provided, the microphone connector uses
the following eight control head connector signals:

Table 2.25 Microphone connector - pins and signals

Pinout

Signal name

Description

Signal type

MIC_RX_AUD

Receive audio output.

Analog

+13V81

Power supply output. Switched off
when radio body is switched off.

Power

MIC_TXD

Asynchronous serial port Transmit data.

3.3V CMOS

MIC_PTT

PTT input from microphone.
Also carries hookswitch signal.

Digital

MIC_AUD

Fist microphone audio input.

Analog

AGND

Analog ground.

Analog ground

MIC_RXD

Asynchronous serial port Receive data.

3.3V CMOS

MIC_GPIO1

General purpose digital input/
output.

Open collector out
3.3V CMOS in

front view

1. Can be switched or unswitched. For more information refer to the service manual.

For characteristics refer to the corresponding signals of the control head
connector.
Note

THSD cannot be used with the Microphone port on TM8200
radios. The microphone port is not available when sending or
receiving THSD. If you intend to send and receive high speed
data (the Wideband Modem Enabled check box is selected), select
either Aux or Internal Options in this field.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Description of the Radio Interfaces

2.9

Blank Control Head Programming Connector
The programming connector of the blank control head is a 9-way standarddensity D-range plug.
This connector can also be used to connect application products, and for
other purposes, as required.
When the blank control head is connected to the radio body, the
programming connector uses the signals shown in Table 2.26:

Table 2.26 TM8105 Programming connector - pins and signals

Pinout

front view

Signal name

Description

Signal type

PRG_RX_AUD

Receive audio output.

Analog

PRG_TXD

Asynchronous serial port Transmit data.

3.3V CMOS

PRG_MIC_AUD

Fist microphone audio input.

Analog

PRG_RXD

Asynchronous serial port Receive data.

3.3V CMOS

PRG_ON_OFF

Hardware power on/software-power Digital
off input. Active low.

+13V81

Power supply output. Switched off
when radio body is switched off.

Power

PRG_PTT

PTT input from microphone.
Also carries hookswitch signal.

Digital

AGND

Analog ground

Ground

DGND

Digital ground

Ground

1. Can be switched or unswitched. For more information refer to the Service Manual.

For characteristics refer to the corresponding signals of the control head
connector.

Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

2.10

RJ45 Control Head Programming Connector
The RJ45 control head has an RJ45 socket for programming (or other
purposes, as required), and a power on/off LED.
Note

The pins of the programming connector is connected in parallel,
so care needs to be taken when connecting external devices to this
connector.

Table 2.27 RJ45 Programming connector - pins and signals

Pinout

Signal name

Signal type

RX_AUD

Receive audio output (after volume
control

Analog

+13.8V

Unswitched 13.8 V power supply

Power

TXD

Asynchronous serial port - transmit
data

3.3V CMOS

PTT

PTT input

Digital

MIC_AUD

Microphone audio input

Analog

AGND

Analog ground

Ground

RXD

Asynchronous serial port - receive
data

3.3V CMOS

ON/OFF

Hardware power on/software power Digital
off

front view

Description

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Description of the Radio Interfaces

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines
This chapter describes the programmable
■

digital input lines

■

digital output lines

■

audio tap out lines

■

audio tap in lines

These input and output lines can be configured using the Programmable
I/O form of the programming application. When configuring an input line,
the Mirrored To column can be used to reflect an input to an output line.
For more information refer to the online help of the programming
application.
The connectors and electrical characteristics of the programmable I/O lines
are described in “Description of the Radio Interfaces” on page 13.

3.1

Digital Input Lines
This section describes the general design principles for use of the
programmable I/O lines configured as inputs, and the input signals that can
be set for them.

Available Input
Lines

The following lines are available to be used as inputs:
Table 3.1

Digital input lines

Signals

Connector

Direction

AUX_GPI1…3

auxiliary connector

input only

AUX_GPIO4…7

auxiliary connector

input or output

IOP_GPIO1…7

internal options connector input or output

CH_GPIO1
MIC_GPIO11
PRG_GPIO11

control head connector
microphone connector
programming connector

input or output

1. CH_GPIO1 of the control head connector is the same signal as MIC_GPIO1 of the
microphone connector (control heads with user interface) and PRG_GPIO1 of the programming connector (blank control head).

For details on the connector pin-outs and electrical characteristics of these
lines refer to “Description of the Radio Interfaces” on page 13.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
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Programmable I/O Lines

Compatibility and
Tolerance

Table 3.2 describes the compatibility of the input lines with common
industry logic standards:
Table 3.2

Digital input lines - compatibility and tolerance

Logic standard input compatibility and tolerance
Input line
3.3V CMOS

5V CMOS

5V TTL

RS-232

AUX_GPI1

Yes

No1

AUX_GPI22

Yes

No1

AUX_GPI33

Yes

No1

AUX_GPIO4…7

Yes

No1

AUX_RXD

Yes

IOP_GPIO1…7

Yes

No1

IOP_RXD

Yes

No1

CH_RXD
MIC_RXD
PRG_RXD

Yes

CH_GPIO1
MIC_GPIO1

Yes

No1

1. Level compatible but not tolerant. Inputs can be made RS-232-tolerant by using
3.3kΩ series resistance inserted at the radio end.
2. Hardware link LK3 not fitted.
3. Hardware link LK2 not fitted.

Input Philosophy

The digital inputs are designed to simplify the interfacing to a wide range of
signal sources, broadly encompassing directly wired switches, open-collector
transistors, opto-isolators, digital logic, and direct microprocessor drive.
In many cases, the amount of interfacing circuitry can be kept to a
minimum, thus reducing design effort and keeping down both cost and
circuit board area.

Input Circuitry

Figure 3.1 shows a simplified circuit diagram of the digital input lines
(ESD protection not shown). For full circuit diagrams, refer to the PCB
Information chapter of the service manual for your radio, or to the technical
support website.
The input lines of the auxiliary connector and the control head connector
are protected against both over-voltage and under-voltage drive via the
clipping diodes and 47kΩ current-limiting resistor. The input lines of the
internal options connector are only protected against minor over-voltage
conditions (refer to “Internal Options Connector” on page 27).

Programmable I/O Lines

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Figure 3.1

Digital input lines - simplified circuit diagrams
+3.3V

+3.3V_CL

33k

AUX_GPI1 to 3
CH_GPIO1

External signals

47k

+3.3V +5V +13.8V

+3.3V_CL

33k

AUX_GPIO4 to 7
47k

+3.3V_CL

+3.3V
33k

IOP_GPIO1 to 7
1k

* not fitted

Pullup Resistors

Pullup resistors are provided on all digital input lines. For the input lines of
the internal options connector and the auxiliary connector this is 33kΩ to
3.3V. For the auxiliary input/output lines, several pullup options are
available for the hardware (refer to “Pullup Resistors” on page 72).

Driving the Inputs

Figure 3.2 shows some possible input drive circuits and illustrates the relative
simplicity of connection to the radio.
Figure 3.2

Digital input lines - input drive circuits

switches, pushbuttons,
relay contacts (n.c. or n.o.)

open collector transistor

to radio

digital logic,
micro-controller ports etc.

opto-isolator
to radio

to radio

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Programmable I/O Lines

Signal Conditioning

Although the radio can apply some debouncing to inputs, excessively noisy
signals may require pre-conditioning to eliminate the worst of the noise.
A simple low-pass filter and hysteresis switch (Schmitt trigger) as shown in
Figure 3.3 will usually be adequate.
Figure 3.3

Digital input lines - signal conditioning

low-pass
filter

Schmitt
trigger
to radio

Debouncing

Physical switches with bounce or jitter make it necessary to introduce a
delay before the input is recognised, in order to prevent multiple activation.
We recommend that you measure this jitter and program the input line
accordingly. If the jitter cannot be measured, we recommend that you set
the debounce time to between 50 and 100ms. If the radio exhibits erratic
behaviour upon closing or opening a switch, try increasing the debounce
time further. Signals from logic circuits or microprocessors generally do not
require debouncing. The input signal must be applied for at least the
duration of the debouncing programmed. Figure 3.4 shows the debouncing
characteristics.
Figure 3.4

Digital input lines - debouncing

change of
input signal

Active Logic Level

radio initiates
input action

The active and inactive logic levels can be programmed to high or low in
the Programmable I/O form of the programming application
Important

programmed
debouncing

Programmable I/O Lines

Because of the pullups, setting the active state to High will
cause the action to commence if the connector is removed
or dislodged while the radio is on. To prevent this happening, set the active state to Low.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Special Purpose
Inputs

AUX_GPI2, AUX_GPI3, and IOP_GPIO7 can be used as general purpose
inputs but can also be configured for the following dedicated purposes:
■

AUX_GPI2 can be set to power the radio up into emergency mode
(refer to “Enter Emergency Mode” on page 48).

■

AUX_GPI3 can be set to control radio power-up/power-down via an
ignition sense signal or similar (refer to “Power Sense (Ignition)” on
page 47).

■

IOP_GPIO7 can be set to control radio power-up/power-down via a
logic signal (refer to “Power Sense (Ignition)” on page 47).

The use of these inputs for power sensing requires that certain hardware links
be placed on the main board assembly. For more information refer to the
service manual.
Note

Input Signals

Conversely, if these inputs are used for other purposes it is important to check that the hardware links are removed. If the hardware
links are not removed the radio may power up or down unexpectedly. Note that some of these links may have been fitted in the factory.

Table 3.3 gives a brief description of the input signals available for programming
of the digital input lines, and indicates whether the input signals are valid for
conventional radio systems, trunked radio systems, or both.

Note

The Mode column refers to the Mode field on the Programmable
I/O form.

Following the table are more detailed notes on each input signal.
Table 3.3

Digital input signals

Input action Mode

Description

“Activate
THSD
Modem” on
page 68

Conventional

Activates the radio’s high speed data (THSD)
modem, ready to send or receive high speed data.
This action is only valid if a license has been obtained
and entered, and the Modem Enabled check box is
selected. When the line is deactivated, the radio will
exit THSD transparent mode.

“BCD Pin 0
to 4” on
page 57

Conventional

A combination of up to 5 BCD lines selects a channel
(Zone and Channel fields) or status (Status field) as
entered on the BCD tab. Set whether the user can
use the radio to access channels using the Front
Panel Channel Selection Lockout check box.

“Decrement Conventional
Channel” on
page 54

The radio goes to the previous channel. Hidden
channels will not be selected.

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© Tait Electronics Limited March 2006

Programmable I/O Lines

Table 3.3

Digital input signals (Continued)

Input action Mode

Description

“Enter
Emergency
Mode” on
page 48

All /
When the line is activated, the radio will enter
Conventional / emergency mode. The radio can optionally enter
Trunked
emergency mode from a powered-off state, by
assigning the action to AUX_GPI2, setting Active to
Low, and fitting hardware link LK3. You can also add
this action to a line on the Internal Options interface
(pins beginning with IOP), but the radio will not
enter emergency mode from a powered-off state. If
LK3 is not fitted, then AUX_GPI2 can be used for
other actions. If activated while in conventional
mode, select whether the radio enters a stealth or a
non-stealth emergency in the Action
Parameters > Emergency Mode field.

“External
Call (ECR)”
on page 50

Trunked

When the line is activated, the radio will set up a call
to the ECR Call String. The call will end when the
line is deactivated (if the ECR Call Clear check box is
selected).

“External
All /
A nominated digital input line acts as an external
PTT 1 and 2” Conventional / PTT (EPTT). When the line is activated, the behaviour
on page 51 Trunked
of the radio will follow the settings on the
Global > PTT form > External PTT (1) or External PTT
(2) tabs. Up to two external PTT input lines may be
assigned using the Auxiliary and the Internal Options
interfaces. All PTT lines can be active at any one
time. The PTT with the highest priority (PTT Priority)
will control the audio path.
“Force Audio All /
Forces the audio power amplifier (PA) off. Received
PA Off” on
Conventional / audio will be processed as normal up to the PA,
page 65
Trunked
allowing that audio to be routed to another source
(such as a handset). When the line is deactivated,
the radio will resume control of the PA and speaker.
“Force Audio All /
Forces the audio power amplifier (PA) on. This allows
PA On” on
Conventional / the speaker to be accessed for other purposes (such
page 64
Trunked
as a beep from an application device). When the line
is deactivated, the radio will resume control of the
PA and speaker.

“Home
Conventional
Channel” on
page 56

The radio goes to a home channel. The home
channel is used with Decrement Channel and
Increment Channel, so the radio can select a new
channel from a known point. Select the home
channel in the Action Parameters > Home Zone and
Home Channel fields. When the line is deactivated,
the radio will remain on the home channel.

“Increment Conventional
Channel” on
page 55

The radio goes to the next channel. Hidden channels
will not be selected.

Programmable I/O Lines

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Table 3.3

Digital input signals (Continued)

Input action Mode

Description

“Inhibit PTT” Conventional
on page 52

Returns the radio to receive mode, and enables or
disables total PTT operation (including monitor
activation, call setup, and voice or data
transmission). This applies to any PTT type with the
Inhibit PTT When External PTT Inhibit Active check
box selected.

“Lock Radio
UI (PIN to
unlock)” on
page 69

All /
Locks the radio. The radio user must press the
Conventional / Security PIN sequence to return the radio to a
Trunked
normal state. This option is only valid if the Security
Lock on Power Up check box is selected.

“Mute
Audio
Output
Path” on
page 62

All /
Closes the mute of selected audio paths so audio
Conventional / will not be received. Select Speaker Audio Path,
Trunked
Auxiliary Audio Path, or All Audio Paths in the
Action Parameters group box.

“Mute
All /
External
Conventional /
Audio Input” Trunked
on page 61

Opens or closes the mute of selected audio paths so
audio will or will not be transmitted. Select Audio
Tap In, Mic Inputs or All Inputs from the Action
Parameters group box.

“Power
Sense
(Ignition)”
on page 47

The radio will attempt to power up when the line is
activated, according to the Power On Mode setting.
When the line is deactivated, the radio will power
down. This action is only valid for the pins
AUX_GPI3 or IOP_GPIO7. If this action is assigned to
AUX_GPI3, the hardware link LK2 must be fitted. If
added to IOP_GPIO7, LK4 must be fitted. To use
these pins for other actions, the respective links
must be removed.

All

“Preset
All /
If in conventional mode, the radio goes to a
Channel” on Conventional / temporary preset channel. When the line is
page 60
Trunked
deactivated, the radio will revert to the channel the
radio was on when the line was activated. While
activated, certain user functions related to the preset
channel are not available, such as preset calls. If in
trunked mode, the radio changes to conventional
mode, and goes to a permanent preset channel. The
radio will remain on that channel, even after the line
is deactivated. Select the preset channel in the
Action Parameters > Preset Zone and Preset Channel
fields.
“RTS Control Conventional
(DCE)” on
page 68

Sets the input line on the radio for hardware flow
control (handshaking). DCE stands for data
communication equipment, and refers to the radio.
The data terminal equipment (DTE) activates this line
to indicate that it is ready to receive serial data from
the radio. Compare with the output CTS Control
(DCE). If this action is assigned to a pin, the RTS field
(Data form) will be automatically updated.

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© Tait Electronics Limited March 2006

Programmable I/O Lines

Table 3.3

Digital input signals (Continued)

Input action Mode

Description

“Send
Channel
Preset Call”
on page 49

Conventional

Sends one of the first four preset calls for the current
channel. If the currently selected channel is assigned
to a Selcall network, this action will send a call on
the Channels form > Selcall Preset Calls tab. If the
currently selected channel is assigned to a DTMF
network, this action will send a sequence on the
Channels form > DTMF Preset Calls tab. Select
preset ID 1, 2, 3, or 4 in the Action
Parameters > Channel Preset Call field.

“Send Mic
Audio to
Spkr” on
page 63

All /
Sends microphone audio to the radio’s speaker. This
Conventional / action, when assigned to CH_GPIO1, can be used
Trunked
with a DTMF microphone to generate DTMF side
tones. When a key is pressed on the microphone,
DMTF tones being transmitted are fed to the radio’s
speaker, at a reduced volume. This gives the radio
user confidence that the tones are being
transmitted.

“Send
Network
Preset Call
1” on page
50

Conventional

Sends one of the first four preset calls for the
network assigned to the current channel. If the
currently selected channel is assigned to a Selcall
network, this action will send a preset call on the
Network Preset Calls tab (Selcall > Free Format
Bursts form). If the currently selected channel is
assigned to a DTMF network, this action will send a
sequence on the Network Preset Calls tab
(DTMF > DTMF Signalling form). Select preset ID 1,
2, 3, or 4 in the Action Parameters > Network Preset
Call field.

“Simulate F1 All /
Initiates the action assigned to a function key,
to F4 Key”
Conventional / creating an external function key. Short and long
on page 66 Trunked
presses of the input line will reflect short and long
presses of the function key. If there is no action
assigned to the function key, then no action will
result.

“Toggle
Alarm
Mode” on
page 67

Conventional

“Toggle
F1 to F4 Key
LED” on
page 67

All /
Results in one of the function key LEDs displaying.
Conventional / This action can be used when the F1 or F4 key has
Trunked
activated an output line (F1 to F4 Key Status), to
indicate the status of an application device.

“Toggle
Stand-by
Mode” on
page 47

All /
When the line is activated, the radio exits stand-by
Conventional / mode into a powered-on state. When the line is
Trunked
deactivated, the radio enters stand-by mode where
the radio appears off. If this action is assigned to
CH_GPIO1, then the line can only be active low (the
Active field must not be set to High).

Programmable I/O Lines

Begins or ends GPS alarm mode. When the line is
activated, the radio will switch to the GPS channel (if
the Poll Response Channel Type is Dedicated), and
begin sending the radio’s current GPS location data
every Callout Interval. Alarm mode will end when
the Maximum Number of Callouts is reached, or this
line is deactivated.

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© Tait Electronics Limited March 2006

Table 3.3

3.1.1

Digital input signals (Continued)

Input action Mode

Description

“Toggle Tx
RF Inhibit”
on page 53

Conventional

Toggles the ability of the radio’s transmitter to
generate radio frequency (RF) power. If the radio is
restricted from generating RF, it will still enter and
exit the transmit state, indicate transmit to the user,
count down any Tx Timer Duration, and send
signalling through the transmit audio path. The state
of this line will not restrict the radio’s ability to
transmit in emergency mode.

“Unmute
Audio
Output
Path” on
page 63

All /
Opens the mute of selected audio paths so audio
Conventional / will be received. Select Speaker Audio Path. Auxiliary
Trunked
Audio Path or All Audio Paths in the Action
Parameters group box.

Toggle Stand-by Mode

Application

This input signal is used to toggle between a powered-on state, and a standby state where the radio appears off. The radio will draw approximately 28mA
when in stand-by mode.

Configuration

Configure an input line and associate it with this action. Set the active state
to high and the debounce time (0 to 100ms).
Note

If using the CH_GPIO port however, this function can only work
when the active state is set to low.

Timing

The input line must be activated for at least 5s.

Description

When the input line is activated, the radio exits stand-by mode.
When the input line is deactivated, the radio enters stand-by mode.

Related Actions

3.1.2

The ‘Power Sense (Ignition)’ input signal can be used to power the radio
down to a consumption of <1mA.

Power Sense (Ignition)

Application

If AUX_GPI3 is configured for ‘auxiliary power sense’ or IOP_GPIO7 is
programmed for ‘internal options power sense’, these input lines can no
longer be used as general inputs. In order to prevent any other action to be
accidentally programmed for one of these input lines, these input lines
should be set to ‘Power Sense (Ignition)’. This setting itself has no function.
For more information refer to the service manual.

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Programmable I/O Lines

3.1.3

Enter Emergency Mode

Application

This input signal is used to enter the emergency mode. For more
information on emergency mode refer to the online help of the
programming application.
Use this action with the AUX_GPI2 line to configure the ‘emergency
power sense’ option to power up the radio into emergency mode. The
‘emergency power sense’ is completely independent of any other power
sense option configured in the radio. For more information refer to the
service manual.
Note

Configuration

The ‘Enter Emergency Mode’ action can be programmed on
AUX_GPI2 or IOP_GPIO1…7, but only AUX_GPI2 provides
the ability to also power up the radio.

If required, configure the ‘emergency power sense’ option as
described in the service manual.

Configure the additional parameters required for the emergency
mode (stealth, emergency call settings etc.).

Configure an input line (AUX_GPI2 with emergency power sense)
and associate it with this action. Set the active state to low.
As the emergency input driver is usually a mechanical switch, to
prevent accidental activation, set the debounce time to 100ms.

Timing

The input line must be activated for at least 2s.

Description

If ‘emergency power sense’ is configured and the radio is off, activation of
AUX_GPI2 for >2s will power up the radio and enter it into emergency
mode immediately. If ‘emergency power sense’ is not configured and the
radio is off, activation of the programmed input line will have no effect.
If ‘emergency power sense’ is not configured and the radio is on, activation
of the programmed input line will enter it into emergency mode
immediately.
The radio will ignore further assertions of this input line until emergency
mode has been exited at which point another assertion of this line would
cause emergency mode to be initiated again.
If this input is active when the radio is powered on, the radio will enter
emergency mode immediately.

Related Actions

None.

Programmable I/O Lines

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3.1.4

Send Channel Preset Call

Application

When activated, this action sends a fixed-format Selcall call, or DTMF call,
for the current channel.
Note

Configuration

Only channel preset call 1 can be sent for TM8200.

Configure channel preset call sequences associated with each network/channel.

Configure the additional parameters required to make a preset call.

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

Timing

Call duration depends on the programmed signalling scheme timing.

Description

When the input line is activated, the leading edge triggers the attempt to
transmit an outgoing call using the signalling scheme associated on this
channel.
The radio will ignore state changes on this input line until the transmission
has completed. Once the transmission has completed, assertion of this input
line will be acted upon as normal.
This input line is of a momentary type and therefore no action is performed
on its deactivation.

Related Actions

The PTT can be programmed to initiate a call on PTT press.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

3.1.5

Send Network Preset Call 1

Application

When the nominated input line is activated, the radio transmits a predefined
free-format sequence over the air.
For both Selcall and DTMF calls, four free format preset sequences can be
specified per network. This input signal is used to send the free format preset
1 sequence over the air. For more information on free format preset
sequences refer to the online help of the programming application.
Note

Configuration

Only free-format preset 1 can be sent with this input signal.

Configure the parameters required to send the free format preset 1
sequence.

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

Timing

Call duration depends on the programmed signalling scheme timing.

Description

When the input line is activated, the radio determines the current channel
and network and sends free format preset 1 sequence.
Tip

Use the input signals for channel selection (e.g. ‘Home Channel’)
to select the channel with the desired network before activating
this signal.

The radio will ignore state changes on this input line until the transmission
has completed. Once the transmission has completed, assertion of this input
line will be acted upon as normal.
This input line is of a momentary type and therefore no action is performed
on its deactivation.
Related Actions

3.1.6

To send other configured free format preset calls, program them to any of
the function keys and use the ‘Simulate F1 to F4 Key’ action to simulate the
key press (refer to “Simulate F1 to F4 Key” on page 66).

External Call (ECR)

Application

When the line is activated, the radio will set up a call to the ECR Call
String. The call will end when the line is deactivated (if the ECR Call Clear
check box is selected). Refer to the programming application online help
for more details.

Configuration

Configure the Fleet Parameters to enable ‘External Call Required’.

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

Programmable I/O Lines

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© Tait Electronics Limited March 2006

Timing

Call duration depends on the programmed signalling scheme timing.

Description

Related Actions

3.1.7

This is the MPT trunked equivalent of “Send Network Preset Call 1” on
page 50.

External PTT 1 and 2

Application

This input signal is used to configure an input line as an external PTT. Up
to two external PTT input lines can be assigned using the auxiliary and the
internal options connectors. All PTT lines may be active at any time, and
the PTT line with the highest priority controls the audio path. For more
information on PTT refer to the online help of the programming
application.

Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time.

Timing

The response time is less than 8ms to 90% of full power plus debounce time.

Description

When the input line is activated, the radio executes the PTT operation.
If the 'Toggle Tx RF Inhibit' or ‘Inhibit PTT’ actions are active, no action
will result. If ‘Toggle Tx RF Inhibit’ or ‘Inhibit PTT’ action is activated
within 300µs following an activation of Activate External PTT action, the
external PTT action will not be initiated.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.

Related Actions

The ‘Reflected PTT Status’ reports the PTT status by generating a logic
OR of all PTT sources programmed to reflect their status.

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Programmable I/O Lines

3.1.8

Inhibit PTT

Application

This input signal is used to stop any current PTT transmissions, return to
receive state and inhibit any further PTT transmission requests. This allows
external applications to interrupt user-initiated transmissions, and prevents
users from interrupting e.g. a data transmission.

Configuration

In the PTT form, configure the ‘Inhibit PTT When External PTT
Inhibit Active’ check box for each PTT type.

In the Programmable I/O form, configure an input line and associate
it with this action. Set the active state (high or low) and the debounce
time (0 to 100ms).

Timing

If this line is activated within 300 µs following an activation of any one of the
PTT sources, the PTT action will not be initiated.

Description

When this input line is activated, the radio stops any current PTT
transmissions and inhibits any further PTT requests.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.
Note

Non-PTT transmission such as calls programmed on a function
key will be carried out, even when this signal is active.

Emergency Mode
Transmission

If an emergency mode transmission is requested, the ‘Inhibit PTT’ action
will be ignored. Once the emergency mode transmission is complete, the
‘Inhibit PTT’ action will be restored if the input line is still active.

Related Actions

The ‘Toggle Tx RF Inhibit’ input signal allows the radio to be in transmit
mode but inhibits transmitting.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
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3.1.9

Toggle Tx RF Inhibit

Application

This input signal is used to prevent the RF carrier from being radiated while
in transmit mode. This can be used e.g. for precise timing of data
transmissions such as GPS.
Figure 3.5

Toggle Tx RF Inhibit
Mute External
Audio Input

Toggle Tx RF Inhibit
Tx audio path

MIC_AUD
AUX_MIC_AUD mux

mute

TX processing chain

modulator

mute
audio tap points
(mapped from AUD_TAP_IN)

Activation of one or more ‘Toggle Tx RF Inhibit’ input lines will inhibit
the radios transmitter PA from generating RF power. The radio is otherwise
unaffected by this input (i.e. the radio will still enter and exit transmit state,
indicate transmit to the user, time transmit duration, send signalling through
the transmit audio path and in all other respects act as per normal).
Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time. This action can be programmed to
both the auxiliary and the internal options connector at the same time
(logical OR).

Timing

The input line has a response time of less than 2.5ms.
If this line is activated within 300µs following an activation of any one of the
PTT sources, the PTT action will not be initiated.

Description

When any ‘Toggle Tx RF Inhibit’ input line is activated and the radio is in
transmit mode (on any channel and independent of the type of
transmission), the radio will ramp down the RF power to <–10dBm
(100µW), but it will remain in the transmit state.
Note

If the transmitting radio is RF inhibited, there is no inhibit beep.

If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.
When all ‘Toggle Tx RF Inhibit’ input lines are deactivated and the radio
is in transmit mode, the radio will ramp up the RF power to its previous
setting.
If the radio starts transmission while one or more ‘Toggle Tx RF Inhibit’
input lines are active, the radio will enter transmit state as normal, but will
not ramp up the RF power.

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Programmable I/O Lines

The radio is able to leave the transmit state (e.g. to return to receive state)
irrespective of the state of the ‘Toggle Tx RF Inhibit’ input lines.
Emergency Mode
Transmission

If an emergency mode transmission is requested, the ‘Toggle Tx RF Inhibit’
input line will be ignored. Once the emergency mode transmission is
complete, the ‘Toggle Tx RF Inhibit’ action will be restored if the input line
is still active.

Related Actions

The ‘Inhibit PTT’ input signal stops any current PTT transmissions, returns
to receive state and inhibits any further PTT transmission requests.

3.1.10

Decrement Channel

Application

This input signal is used to select the next lowest channel. This action uses
the same restrictions for channel wrap around as programmed.

Configuration

Configure a list of channels.

Enable or disable the front panel lockout as desired (BCD tab).

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

Select a defined channel, if desired, using the ‘Home Channel’
actions.

Timing

The time between pulses should be at least 20ms. The minimum pulse
width is the debounce time plus 2ms.

Description

When this input line is activated, the radio decrements the current channel.
If the radio is at the start of the channel list and wrap around is disabled, the
radio ignores the channel change request.
Note

The one-digit control head restricts user mode selection of fixed
channels or a group to those channels in the range 0 to 9. If a
channel that is not permitted for the one-digit control head is
requested, then the radio shall select the first/last permitted channel (wrap around).

This input line is of a momentary type and therefore no action is performed
on its deactivation.
Related Actions

The ‘Increment Channel’ input signal performs the corresponding action of
incrementing the channel.
The ‘BCD Pin 0 to 4’ input signal is used to change to a specified channel
number.
The ‘Home Channel’ input signal is used to change to a specified reference
channel, which can be used to increment or decrement from.

Programmable I/O Lines

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3.1.11

Increment Channel

Application

This input signal is used to select the next highest channel. This action uses
the same restrictions for channel wrap around as programmed.

Configuration

Configure a list of channels.

Enable or disable the front panel lockout as desired (BCD tab).

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

Select a defined reference channel, if desired, using the ‘Home
Channel’ action.

Timing

The time between pulses should be at least 20ms. The minimum pulse
width is the debounce time plus 2ms.

Description

When this input line is activated, the radio increments the current channel.
If the radio is at the end of the channel list and wrap around is disabled, the
radio ignores the channel change request.
Note

This input line is of a momentary type and therefore no action is performed
on its deactivation.
Related Actions

The ‘Decrement Channel’ input signal performs the corresponding action
of decrementing the channel.
The ‘BCD Pin 0 to 4’ input signal is used to change to a specified channel
number.
The ‘Home Channel’ input signal is used to change to a specified reference
channel, which can be used to increment or decrement from.

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Programmable I/O Lines

3.1.12

Home Channel

Application

This input signal is used to change to a specified reference channel, which
can then be used to increment or decrement from.

Configuration

Configure a list of channels.

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

On the same form, select the home channel.

Timing

Allow 10ms before applying another channel change action.

Description

When this input line is activated, the radio changes to the home channel.
This input line is of a momentary type and therefore no action is performed
on its deactivation.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.
Note

Related Actions

The one-digit control head restricts user mode selection of fixed
channels or a group to those channels in the range 0 to 9. If a
channel that is not permitted for the one-digit control head is
requested, then the request shall be ignored and the radio shall
remain on the original channel.

The ‘Preset Channel’ input signal is used to temporarily select a preprogrammed channel
The ‘BCD Pin 0 to 4’ input signal is used to change to a specified channel
number.
The ‘Increment Channel’ and ‘Decrement Channel’ input signals are used
to increment or decrement the current channel by one.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
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3.1.13

BCD Pin 0 to 4

Application

These signals are used by TM8100 and TM8200 radios to select a discrete
channel using a bit pattern on up to five input lines. With TM8200 radios
they can also be used to select Selcall status.

TM8100 BCD/BIN
Operation

The bit pattern can be decoded in BCD or binary (BIN) operation.
In BCD operation, the bit pattern is divided into a block of four signals (pin
0 to 3) to provide the decimal numbers 0 to 9 (0000 to 1001), and a most
significant bit (pin 4) to indicate 0 or 1. This allows five lines to represent
the decimal channel numbers 0 to 19. Invalid BCD bit patterns are ignored.
In BIN operation, the bit pattern represents the decimal channel numbers
0 to 31.
Table 3.4 shows a list of BCD pin signals and their equivalent BCD and BIN
channel numbers for TM8100 radios.
When any of these input lines changes, the corresponding channel will be
selected.
Table 3.4

TM8100 BCD pin signals and BCD/binary channels

BCD Pin

Channel

BCD

BIN

…

9
1

…

…
1

…

25
1

…

Prev1

1. ‘Prev’ means that the input is ignored (invalid BCD) and that the previously selected channel remains selected.

TM8200 BCD/BIN
Operation

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
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Programmable I/O Lines

significant bit (pin 4) to indicate 0 or 1. This allows five lines to represent
the decimal channel numbers 1 to 19. Invalid BCD bit patterns are ignored.
In BIN operation, the bit pattern represents the decimal channel numbers
1 to 31.
When channel 0 is selected in either BCD or BIN mode, no channel change
occurs.
Table 3.5 shows a list of BCD pin signals and their equivalent BCD and BIN
channel numbers for TM8200 radios.
When any of these input lines changes, the corresponding channel will be
selected.
Table 3.5

TM8200 BCD pin signals and BCD/binary channels

BCD Pin

Channel

BCD

BIN

No change

…

9
1

Prev1

…

…
1

…

25
1

26
…

1. ‘Prev’ means that the input is ignored (invalid BCD) and that the previously selected channel remains selected.

Configuration

Configure up to 5 input lines and associate them with this action.
Set the active state (high or low) and the debounce time (preset to
10ms). Lines must be assigned in order, starting with pin 0 (LSB).
Unassigned signals are assumed to be logic 0.

Select BCD or BIN operation (BCD tab).

Enable or disable the front panel lockout as desired (BCD tab).

Configure a list of channels corresponding to the BCD or binary
values.

Programmable I/O Lines

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Timing

A fixed debounce time of 4ms is applied to all BCD inputs to ensure that all
lines have settled to their new state before being read. This is adequate for
logic-driven inputs but additional debounce time needs to be programmed
if a BCD switch or similar is used.

Description

When the current state of the BCD input lines is changed, the radio
determines the new channel according to Table 3.4 and selects it for use.
When the radio is turned on, the BCD input lines are read. If the BCD
input lines are not set to zero, the radio will select the corresponding
channel. If they are set to zero, the radio will select the last saved channel.
If the bit pattern in BCD operation does not represent a valid BCD number
(from 01010 to 01111, and from 11010 to 11111), the radio will remain on
the current channel.
When the current state of the BCD input lines is changed while the radio
is in transmit mode, the channel change will be carried out as soon as the
radio returns to receive mode.
Note

Related Actions

The one-digit control head restricts user mode selection of fixed
channels or a group to those channels in the range 0 to 9. If a
channel that is not permitted for the one-digit control head is
requested, then the request shall be ignored and the radio shall
remain on the original channel.

The ‘Increment Channel’ and ‘Decrement Channel’ input signals are used
to increment or decrement the current channel by one.
The ‘Home Channel’ input signal is used to change to a specified reference
channel, which can be used to increment or decrement from.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
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Programmable I/O Lines

3.1.14

Preset Channel

Application

This input signal is used to temporarily select a pre-programmed channel.
When this input line is deactivated, the radio returns to the channel it was
on at the time the input line was activated. This allows temporary channel
change for purposes such as transmitting GPS data on a data channel instead
of the voice channel.
Note

Configuration

On MPT trunked systems, this input signal selects the channel
permanently. It will not change back on deactivation. Refer to the
programming application online help for more details.

Configure a list of channels.

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

On the same form, select the preset channel. Hidden channels are also
available for selection. Scan group IDs are not available.

Timing

Allow debounce time plus 2ms plus time for channel change (typically
10ms) for the preset channel to be selected or to return to the previous
channel. If timing is critical in your application, then this will need to be
measured with the frequency step you intend to use.

Description

When the input line is activated, the currently selected channel ID is stored
for future use and the radio changes to the preset channel.
When the input line is deactivated, the radio returns to last selected channel.
While the input line is activated, the channel selection keys on the control
head are not functional.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.
If a preset channel is selected, and the radio powers down and up again, then
the last selected channel will be selected, not the preset channel.
Note

Related Actions

The one-digit control head restricts user mode selection of fixed
channels or a group to those channels in the range 0 to 9. If a
channel that is not permitted for the one-digit control head is
requested, then the request shall be ignored and the radio shall
remain on the original channel.

The ‘BCD Pin 0 to 4’ input signal is used to change to a specified channel
number.
The ‘Home Channel’ input signal is used to permanently change to a
specified reference channel, which can be used to increment or decrement
from.

Programmable I/O Lines

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3.1.15

Mute External Audio Input

Application

This input signal is used to open or close the mute of selected audio inputs
to allow or prevent transmission of unwanted audio. This can be useful in
cases where a controller wants to send information and does not want to be
interrupted by incoming audio.
Figure 3.6

Mute External Audio Input
Mute External
Audio Input
Tx audio path

MIC_AUD
AUX_MIC_AUD mux

Toggle Tx RF Inhibit

mute

TX processing chain

modulator

mute
audio tap points
(mapped from AUD_TAP_IN)

Configuration

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

On the same form, configure an option to mute the audio from the
microphone inputs, the audio tap inputs, or all audio inputs.

Timing

The response time for both activation and deactivation is approximately 2ms
plus debounce time.

Description

When the input line is activated, the radio mutes the audio input(s) selected.
If a higher priority unmute condition exists, activation of this line will have
no effect.
When the input line is deactivated, the audio input path reverts to its
previous state. If a higher priority mute condition exists, deactivation of this
line will have no effect.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.

Related Actions

None.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

3.1.16

Mute Audio Output Path

Application

This input signal is used to close the mute of selected audio paths to prevent
audio from being output. This allows an external device to turn off audio to
the speaker (e.g. for a data channel) or other audio equipment.
Figure 3.7

Mute/Unmute Audio Path
RX_BEEP_IN
beep audio path
Mute/Unmute
Audio Output Path
Rx audio path

RX processing chain
audio tap points
(on AUD_TAP_OUT)

Configuration

vol

mute

speaker

audio PA

RX_AUD

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

On the same form, configure an option to mute the audio output of
the speaker output path, the auxiliary output path, or all output paths.

Timing

The response time for both activation and deactivation is approximately 2ms
plus debounce time.

Description

When this input line is activated, the radio mutes the configured audio
output path(s). If a higher priority unmute condition exists, activation of this
line will have no effect.
When this input line is deactivated, the audio output path(s) reverts to its
(their) previous state. If higher priority mute condition exists, deactivation
of this line will have no effect.
If the input line is active when the radio is powered up, it must be re-applied
for the action to be carried out.

Related Actions

The ‘Unmute Audio Output Path’ input signal activates the Rx audio path
only.
The ‘Force Audio PA Off’ input signal deactivates the audio PA.
The ‘Force Audio PA On’ input signal activates the audio PA.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
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3.1.17

Unmute Audio Output Path

Application

This input signal is used to open the mute of selected audio paths to allow
audio to be received. This allows the signal to go through to the speaker (e.g.
for beeps of an external device, a public address system, or an external voice
recorder). Please refer also to Figure 3.7 on page 62.

Configuration

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

On the same form, configure an option to unmute the audio output
of the speaker output path, the auxiliary output path, or all output
paths.

Timing

The response time for both activation and deactivation is approximately 2ms
plus debounce time.

Description

When this input line is activated, the radio unmutes the configured audio
output path(s). If a higher priority mute condition exists, activation of this
line will have no effect.
When this input line is deactivated, the audio output paths revert to their
previous state. If higher priority unmute condition exists, deactivation of
this line will have no effect.

Related Actions

The ‘Mute Audio Output Path’ input signal deactivates the Rx audio path
only.
The ‘Force Audio PA Off’ input signal deactivates the audio PA.
The ‘Force Audio PA On’ input signal activates the audio PA.

3.1.18

Send Mic Audio to Spkr

Application

Sends microphone audio to the radio’s speaker.

Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time.

Timing

The response time for both activation and deactivation is approximately 2ms
plus debounce time.

Description

When this input line is activated, the radio routes the microphone audio
path to the speaker.
When this input line is deactivated, the microphone path to the speaker is
removed.
If this input line is active at power-up, the configured action on activation
has to be executed after startup, on transition to user mode.

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Programmable I/O Lines

This action, when assigned to CH_GPIO1, can be used with a TM8100 or
TM8200 DTMF microphone to generate DTMF side tones. When a key is
pressed on the microphone, DTMF tones being transmitted are fed to the
radio’s speaker, at a reduced volume. This gives the radio user confidence
that the tones are being transmitted.
Related Actions

The ‘Mute Audio Output Path’ input signal activates the Rx audio path
only.
The ‘Unmute Audio Output Path’ input signal deactivates the Rx audio
path only

3.1.19

Force Audio PA On

Application

This input signal is used to activate the audio PA. This action is required to
allow any audio on the RX_BEEP_IN line of the internal options
connector to be heard from the speaker when no other audio unmute
conditions exist.
Figure 3.8

Force Audio PA on/off
RX_BEEP_IN
beep audio path
Force Audio PA
on/off
Rx audio path

RX processing chain
audio tap points
(on AUD_TAP_OUT)

vol

mute

audio PA

speaker

RX_AUD

Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time.

Timing

When this input line is activated and the audio PA is off, there will be a delay
of 50ms before audio PA output is unmuted. This delay prevents undesired
transient noise (audible ‘pop’) caused by the audio PA powering up. If the
audio PA is already on or there has been speaker audio within 100ms prior
to activation there is no significant unmute delay.

Description

When this input line is activated, the radio unmutes the audio PA. If the
audio PA is already unmuted, no action occurs. If a higher priority mute
condition exists, activation of this line will have no effect.
When this input line is deactivated, the audio PA reverts to its previous state.
If a higher priority unmute condition exists, deactivation of this line will
have no effect.

Programmable I/O Lines

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© Tait Electronics Limited March 2006

If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.
Related Actions

A related ‘Force Audio PA Off’ input signal exists, for which another input
line can be assigned. Separate input lines are needed because deactivation of
each line should release the corresponding action rather than forcing the
audio PA into the opposite state.
The ‘Mute Audio Output Path’ input signal activates the Rx audio path
only.
The ‘Unmute Audio Output Path’ input signal deactivates the Rx audio
path only.

3.1.20

Force Audio PA Off

Application

This input signal is used to deactivate the audio PA. This action is required,
for example, to allow the use of a telephone handset for which - when it is
taken off hook - the audio PA should be deactivated to prevent the audio
from coming out of the internal or remote speaker. Please refer also to
Figure 3.8 on page 64.

Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time.

Timing

When this input line is activated and the audio PA is on, there will be no
significant delay before the speaker audio is muted. After 100ms the audio
PA will be fully powered down and current consumption will reduce by
50mA.

Description

When this input line is activated, the radio mutes the audio PA. If the audio
PA is already muted, no action occurs.
When this input line is deactivated, the audio PA reverts to its previous state.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.
Activation of ‘Force Audio PA Off’ input line takes precedence over the
‘Force Audio PA On’ input line. When both inputs are active at the same
time, the speaker is disabled but any audio signal present is still output
through RX_AUD.

Related Actions

A related ‘Force Audio PA On’ input signal exists, for which another input
line can be assigned. Separate input lines are needed because deactivation of
each line should release the corresponding action rather than forcing the
audio PA into the opposite state.
The ‘Mute Audio Output Path’ input signal activates the Rx audio path
only. The ‘Unmute Audio Output Path’ input signal deactivates the Rx
audio path only.

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Programmable I/O Lines

3.1.21

Simulate F1 to F4 Key

Application

These input signals are used to simulate the press of function keys on the
control head. Both short and long key presses can be simulated.
These input lines do not perform any pre-defined actions, but only simulate
the press of specific function keys. This means that when the associated
function key is re-programmed to carry out a different function, activation
of this line will also carry out the new function.

Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time.

Timing

When a function key has only one function assigned, the key press will be
actioned as soon as it is sensed.
When a function key is assigned different functions for short and long key
press:
■

The short key press function will be actioned as soon as the signal is
released, if the signal has been active for between 100 and 750ms.

■

The long key press function will be actioned as soon as the signal has
been active for 750 ms.

Description

When any of these input lines is activated, the function associated with the
corresponding function key is carried out. Short/long activations of this
input line will have the same effect as short/long function key presses.

Related Actions

The ‘Toggle F1 to F4 Key LED’ input signals are used to turn the LEDs of
the control head on and off for display purposes, e.g. for key functions that
have no LED assigned.
The ‘F1 to F4 Key Status’ output signals are used to reflect the press of
function keys on the control head.

Programmable I/O Lines

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3.1.22

Toggle F1 to F4 Key LED

Application

These input signals are used to turn the LEDs of the control head on and off
for display purposes, e.g. for key functions that have no LED assigned. When
any of these lines are active, no other source will be able to control the
associated LED.
Note

The graphical-display control head only has two LEDs, for the F1
and F4 key.

Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time.

Timing

The display is updated every 50ms. The response time of the LED can
therefore be between 2 and 52ms plus debounce time.

Description

When this input line is activated, the associated LED lights up.
When this input line is deactivated, the associated LED goes out.
If the input line is active while the radio is powered up, it must be re-applied
for the action to be carried out.

Related Actions

The ‘Simulate F1 to F4 Key’ input signals are used to simulate the press of
function keys on the control head. Both short and long key presses can be
simulated.
The ‘F1 to F4 Key Status’ output signals are used to reflect the press of
function keys on the control head.

3.1.23

Toggle Alarm Mode

Application

Begins or ends GPS alarm mode.
When the line is active, the radio will switch to the channel indicated by the
Channel Type, and begin sending the radio’s current GPS location data
every Callout Interval.
Alarm mode will end when the Maximum Number of Callouts is reached,
or the line is deactivated.

Configuration

Timing

Configure the Emergency Mode and Channel Type parameters
required, as well as the SDM Enabled and GPS Alarm Mode parameters.

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

The response time for both activation and deactivation is approximately 2ms
plus debounce time.

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Programmable I/O Lines

The input line is activated by a third party device.

Description

The radio immediately begins the Alarm Mode operation according to the
characteristics defined for the network and channel.
The radio will cancel Alarm Mode operation once this input is deactivated.
If this input is active at power-up, the Alarm Mode is entered immediately
at startup.
Related Actions

3.1.24

None

Activate THSD Modem

Application

Activates the radio’s high speed data (THSD) modem, ready to send or
receive high speed data.

Configuration

Configure an input line and associate it with this action. Set the active state
(high or low) and the debounce time.

Timing

The response time for both activation and deactivation is approximately 2ms
plus debounce time.

Description

When the nominated input line is activated, the radio will activate the
THSD modem. This will select the protocol according to the database
settings for THSD protocol and FEC.
This action is only valid if a Software Feature Enabler (SFE) license has been
obtained, and entered, and the Modem Enabled check box has been
selected. When the line is deactivated, the radio will exit THSD transparent
mode.
Note

Related Actions

3.1.25

Powerup State “THSD Transparent Mode”.

RTS Control (DCE)

Application

If the radio is configured to startup in THSD transparent mode,
then deactivation of the input ‘Activate THSD Mode’ will not
exit THSD transparent mode after the radio is powered up.

Programmable I/O Lines

If this action is assigned to a pin, the RTS field will be automatically updated.

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Important

Configuration

Inputs selected for this purpose will need to have a 3K3
resistor placed in series with the input, to make them
RS232 level compatible.

Configure Serial Communications - Flow Control in Command
Mode and/or Transparent Mode for “Hardware”.

Select Hardware Flow Control I/O Pins for both CTS (DCE) and
RTS (DCE).

Configure Active Low/High for RTS and CTS.

Configure Debounce time for RTS and CTS.

The input response time for both activation and deactivation of RTS (DCE)
is less than 1ms.

Timing

Note

Debounce time for RTS (DCE) should be set to ‘0’.

Description

The external third party device (DTE) activates this RTS control line to
indicate to the radio that it is ready to receive serial data from the associated
TXD line of the radio.

Related Actions

‘CTS Control (DCE)’ sets the output line on the radio for hardware flow
control.

3.1.26

Lock Radio UI (PIN to unlock)

Application

Locks the radio. The radio user must press the Security PIN sequence to
return the radio to a normal state. This option is only valid if the Security
Lock on Power Up check box is selected.

Configuration

Configure the security PIN.

Configure an input line and associate it with this action. Set the active
state (high or low) and the debounce time.

Timing

Allow debounce time plus 2 ms.

Description

When the input line is activated, the radio UI goes into secure mode.

Related Actions

None.

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Programmable I/O Lines

3.2

Digital Output Lines
This section describes the general design principles for use of the
programmable I/O lines configured as outputs, and the output signals that
can be set for them.

Available Output
Lines

The following lines are available to be used as outputs:
Table 3.6

Digital output lines

Signals

Connector

Direction

AUX_GPIO4…7

auxiliary connector

input or output

IOP_GPIO1…7

internal options connector input or output

CH_GPIO1
MIC_GPIO11
PRG_GPIO11

control head connector
microphone connector
programming connector

input or output

For details on the connector pin-outs and electrical characteristics of these
lines refer to “Description of the Radio Interfaces” on page 13.
Compatibility

Table 3.2 describes the compatibility of the output lines with common
industry logic standards:
Table 3.7

Digital output lines - compatibility

Logic standard output compatibility
Output line
3.3V CMOS

5V CMOS

5V TTL

RS-2321

AUX_GPIO4…7

Yes

Yes2

Yes

AUX_TXD

Yes

IOP_GPIO1…7

Yes

No3

Yes

IOP_TXD

Yes

No3

Yes

CH_TXD
MIC_TXD
PRG_TXD

Yes

CH_GPIO1
MIC_GPIO1

Yes

No3

Yes

1. While the output levels do not comply with the RS-232 standard, almost all modern
RS-232 level conversion devices are 3.3V/5V CMOS or TTL level-compatible. Therefore, it usually possible to drive modern external RS-232 devices directly without level
conversion if the length of the connection cable is <3m.
2. Yes, provided internal pullups to 5V are selected.
3. These outputs can be made 5V CMOS-compatible using a 3.3kΩ pullup resistor to
5V that is provided by the device being driven.

Programmable I/O Lines

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Output Circuitry

The digital outputs are designed to interface to application circuitry in a
straightforward manner. Figure 3.9 shows a simplified diagram of the digital
output lines (ESD protection not shown). For full details of the interface,
refer to the PCB information or to the technical support website.
Figure 3.9

Digital output lines - simplified circuit diagrams

+13.8V +5V +3.3V
+3.3V

33k*
AUX_GPIO4…7a
CH_GPIO1

100k
4.7k
4.7k
+3.3V

a. With AUX_GPIO4…7, the
33kΩ resistor can be
moved to change the logic
high output voltage to +5V
or +13.8V.

33k
IOP_GPIO1…7

The internal logic circuitry of the radio operates at 3.3V. Unless application
circuitry is able to operate at this voltage level, some form of level conversion
will normally be required. With the AUX and CH output lines, conversion
to 5V or 13.8V can be selected by moving the pullup resistor as indicated
in Figure 3.9.
Note

These resistors only provide a weak pullup and hence the output
is only able to source a very small current. In the logic low state,
the outputs can sink a higher current. For more information refer
to “Description of the Radio Interfaces” on page 13.

The IOP output lines always operate at 3.3V logic levels and any level
conversion is the responsibility of the application circuit designer.

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Programmable I/O Lines

Pullup Resistors

For the output lines AUX_GPIO4 to AUX_GPIO7 the output
configuration is open collector with pullup. The hardware provides several
pullup options.
Placeholder pullup resistors to 3.3V, 5V or 13.8V are provided. Table 3.8
gives an overview of the output lines and their placeholder pullup resistors.
Table 3.8

Placeholder pullup resistors

Output line

3.3V pullup

5V pullup

13.8V pullup

AUX_GPIO4

R7691

R778

R782

AUX_GPIO5

R7701

R779

R783

AUX_GPIO6

R7711

R780

R784

AUX_GPIO7

R7721

R781

R785

1. Factory default.

At power up and power off, the voltage of the output lines will be
determined by the fitting of the pullup resistors.
Figure 3.10 shows the positions of these placeholders on the main board
assembly.
Follow the instructions of the service manual for your radio on removing
and fitting the radio lid, the main board assembly, and SMD components.
For any I/O line, exactly one pullup resistor must be fitted. To change the
pullup option it is recommended to move the factory-fitted pullup resistor
to the desired location.
If you require a different pullup resistance value, remove the factory-fitted
resistor and fit your own in the desired location. The current through the
pullup resistor must not exceed 5mA when the output is low. For example,
the value of a pullup resistor to 5V must be >1kΩ.
Figure 3.10

Positions of placeholder pullup resistors on main board assembly

top side

Programmable I/O Lines

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Special Purpose
Outputs

AUX_GPIO4 can be used as a general purpose output with normal drive
levels, or it can be configured as a high current sink output capable of
directly driving external devices. To configure high current sink, a high
power transistor must be soldered to the main board assembly. For more
information refer to “Connecting an External Alert Device” on page 129.

Momentary or
Latching

Output signals are latching or momentary, depending on their function.
Examples: ‘Control Status Rx (Line 1 to 3)’ is always latching. Most of the
other output signals are momentary. ‘F1 to F4 Key Status’ can be either
latching or momentary.
Figure 3.11

Momentary and latching output signals

input
t
output
(momentary)
t
output
(latching)
t

Power-Up
Considerations

During power-up of the radio, any I/O lines configured as outputs are in an
uncontrolled and high-impedance state. The pullup resistors have a
dominant effect and thus all outputs will appear as if they are indicating logic
high during this period.
The radio will not actively control these lines for up to 1 to 2 seconds after
power is first applied, or the radio has been switched on. It is therefore
important to consider how this will affect application circuitry interfaced to
the radio, and to take measures to manage what happens during this
transition.
Defining the active state of the outputs as logic low may provide suitable
protection, as outputs will appear inactive during radio power-up. In other
cases it may be necessary to buffer the outputs with suitable circuitry to
isolate application circuits from the radio signals during this transition.

Output Signals

Table 3.9 gives a brief description of the output signals available for
programming of the digital output lines, and indicates whether the output
signals are valid for conventional radio systems, trunked radio systems, or
both.
Note

The Mode column refers to the Mode field on the Programmable
I/O form.

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Programmable I/O Lines

Following the table are more detailed notes on each output signal.
Table 3.9

Digital output signals

Output
action

Mode

Description

“Busy Status” Conventional
on page 77

Activates the output line when the radio detects a
carrier signal (the busy detect LED indicator is on).
When the carrier ends, the line will deactivate.

“Call Setup
Status” on
page 84

Conventional

Activates the output line when a call is set-up
(monitor opens due to a sequence sent or received).
When monitor closes, the line will deactivate.

“Channel
Locked
Status” on
page 79

All /
Activates the output line when the radio displays
Conventional / OL (the synthesiser is out-of-lock). This means the
Trunked
radio cannot transmit due to being out of band,
and can indicate hardware failure. When the radio
is able to transmit on a channel, the line will
deactivate.

“Control
Status Rx
(Line 1 to 3)”
on page 85

Conventional

Activates the output line when a Selcall sequence is
received that contains a control status set to
Activate Digital Line (after the Digital Line Control
Status Delay). The line will deactivate when a
control status is received set to Deactivate Digital
Line.

“CTS Control Conventional
(DCE)” on
page 89

Sets the output line on the radio for hardware flow
control (handshaking) while in conventional mode.
DCE stands for data communication equipment,
and refers to the radio. The radio activates this line
to indicate that it is ready to receive serial data from
the Data Terminal Equipment (DTE). Compare with
the input RTS Control (DCE). If this action is
assigned to a pin, the CTS field (Data form) will be
automatically updated.

“External
Alert 1 and
2” on page
80

All /
Activates one or both output lines (in a
Conventional / programmed pattern and after a programmed
Trunked
delay) when certain call types are received. In
conventional mode, this applies to Selcall or twotone calls received with External Alert 1 or External
Alert 2 programmed. In trunked mode, this applies
to call types that are selected on the MPT Alerts
form > External Alerts tab. The line will deactivate
and stay deactivated when the call is answered, or
the programmed duration expires.

“F1 to F4 Key All /
Activates the output line when the function key is
Status” on
Conventional / pressed. Select the Signal State as Momentary or
page 87
Trunked
Latching, and assign the Action Digital Output Line
option to the function key on the Key Settings
form. The line will deactivate when the key is
released (momentary), or pressed a second time
(latching).

Programmable I/O Lines

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Table 3.9

Digital output signals (Continued)

Output
action

Mode

Description

“FFSK Data
Received
Status” on
page 88

Conventional

Activates the output line at the beginning of a valid
fast frequency shift keying (FFSK) data reception.
The line will deactivate when the data is no longer
valid (for example, the signal has ended).

“Hookswitch
Status” on
page 83

All /
Activates the output line when the microphone is
Conventional / removed from the hookswitch. When the
Trunked
microphone is placed back on the hook, the line
will deactivate.

“Monitor
Status” on
page 83

Conventional

No Action

All /
The radio will not activate the output line, unless
Conventional / the output is selected for an input pin’s Mirrored To
Trunked
field.

“On Data
Traffic
Channel” on
page 83

Trunked

Activates the output line when the radio is on a
traffic channel and ready to send or receive data.
The line will deactivate when the call ends.

“Public
Address
Status” on
page 81

Conventional

Activates the output line when the radio is in public
address mode and a PTT is active (pressed). The line
will deactivate when the PTT is no longer active
(released). If using the Tait Public Address options
board, this action must be assigned to IOP_GPIO2,
and Active set to high.

“Radio Has
Service” on
page 77

Trunked

Activates the output line when a the radio has
service and is able to communicate with the
network. The line will deactivate if the radio loses
service (the service symbol is flashing).

“Radio Idle”
on page 84

Trunked

Activates the output line when the radio is idle and
ready to accept an incoming or outgoing call
request. The line will deactivate when the radio is
no longer idle (for example, is involved in a call).

“Radio On
Traffic
Channel” on
page 83

Trunked

Activates the output line when the radio is on a
voice or data traffic channel. The line will deactivate
after the call ends.

“Radio
Ready” on
page 90

All /
Activates the output line when the radio is powered
Conventional / up and fully initialised in either conventional mode
Trunked
or trunked mode. The line will deactivate when the
radio powers down, or during a change of mode.

Activates the output line when monitor is open,
due to a call setup, a function key press, the menu,
or a PTT press. When monitor closes, the line will
deactivate. If monitor opens when the microphone
is removed from the hook (Hookswitch Monitor),
the line will not be asserted.

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Programmable I/O Lines

Table 3.9

Digital output signals (Continued)

Output
action

Mode

Description

“Radio
Stunned” on
page 86

All /
Activates the output line when the radio is stunned,
Conventional / and deactivates the line when the radio is revived.
Trunked
In conventional mode, the radio is stunned when a
Selcall call is received that contains a control status
set to Full Stun or Tx Stun, and is revived when a
control status is received that is set to Revive. Stun
and revive is not valid in trunked mode for this
release.

“Radio
Transmission
Status” on
page 78

All /
Activates the output line when the radio is
Conventional / transmitting. The line will deactivate when the radio
Trunked
ends RF transmission.

“Ready For
NPD” on
page 89

Trunked

Activates the output line when the radio is able to
set up a data call, or is on a data traffic channel.
The line will deactivate when the radio is unable to
transmit data over-the-air from the terminal
equipment (for example, during a hunting or a call
setup procedure).

“Reflected
PTT Inhibit
Status” on
page 81

Conventional

Activates the output line when the current PTT is
inhibited (according to the settings on the PTT
form). The line will deactivate when the PTT is no
longer inhibited.

“Reflected
PTT Status”
on page 79

All /
Activates the output line when a PTT is active. This
Conventional / applies to any PTT with the PTT State is Reflected
Trunked
check box selected. When the PTT is released, the
line will deactivate.

“Reflect THSD Conventional
Modem
Status” on
page 82

Activates the output line whenever the THSD
modem has been activated, and the radio is in
THSD transparent mode. The radio can enter THSD
transparent mode via the programmable input
Activate THSD Modem, the Powerup State, or a
CCDI command. The line will deactivate when the
radio exits THSD transparent mode.

“Serial Data
Tx In
Progress” on
page 89

Conventional

Activates the output line whenever the radio is
transmitting serial data. This does not apply to GPS
data sent via the GPS Port. This option can be used
with the Line Interface board to provide RS 485
support. The line will deactivate when the radio
stops transmitting data via the TXD line.

“SIBT
Received” on
page 86

Conventional

Activates the output line when a single in-band
tone is detected as valid on a channel. The line will
deactivate as soon as the carrier ends.

“Signalling
Audio Mute
Status” on
page 82

Conventional

Activates the output line when valid traffic is
detected. If there is no subaudible or selective
signalling on a channel, then activity detected is
always valid and the line asserted. The line will
deactivate when the audio mute closes.

Programmable I/O Lines

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3.2.1

Busy Status

Application

This output signal is used to reflect the busy status, i.e. whether or not the
receiver detects an RF carrier (busy detect LED is on). The detection of the
RF carrier can be based on either signal strength (RSSI) or noise level.
This allows the radio to wake up a receiving modem or start voice recording
(for example).
Note

The detection method can be set in the Squelch Detect Type field
of the Networks / Basic Settings form (Basic Networks Settings
tab) of the programming application. For more information refer
to the online help of the programming application

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Timing

The response time of this output line is <5ms for signal strength (RSSI), and
<20ms for noise level.

Description

When the radio detects a change in the state of the busy-detect circuitry, the
radio sets the state of this output line to reflect the busy detect state. When
‘busy’, the output line is active. When ‘not busy’, the output line is inactive.

Related Actions

An indication of received signal strength is available from the RSSI output.
The ‘Signalling Audio Mute Status’ output signal indicates that a signal is
being received which also has valid signalling.

3.2.2

Radio Has Service

Application

Activates the output line when a the radio has service and is able to
communicate with the network. The line will deactivate if the radio loses
service (the service symbol is flashing).

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Related Actions

This is the MPT equivalent of “Busy Status” on page 77.

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Programmable I/O Lines

3.2.3

Radio Transmission Status

Application

This output signal indicates whether the radio is in transmission mode.
This can be used
■

with external modems as a gate for the start of data transmission

■

with external applications, instead of looking at the PTT status, in order
not to interrupt a transmission by the user

■

to switch scramblers from receive to transmit

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Timing

Rx to Tx: The GPIO output changes state 4.0+/-0.5msec before radio
reaches 90% Tx power output.
Tx to Rx: The GPIO output changes state 7.5+/-0.5msec after Tx power
output falls to -10dBm.

Description

When the radio starts an RF transmission, this output line is activated.
When the radio stops the RF transmission, this output is deactivated.
While the ‘Toggle TX RF Inhibit’ input line is active, the RF output will
be inhibited, but the radio stays in transmit mode (refer to “Toggle Tx RF
Inhibit” on page 53). The ‘Radio Transmission Status’ input line is not
affected by the ‘Toggle TX RF Inhibit’ input line.

Related Actions

The ‘Reflected PTT Inhibit Status’ output signal reports transmission
requests via any of the PTT input signals.

Programmable I/O Lines

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3.2.4

Channel Locked Status

Application

This output signal is used to indicate the frequency lock status of the
synthesizer and is constantly activated during normal operation. The output
is deactivated if the radio synthesizer is unable to “lock” to the current
channel frequency, which can be caused by a hardware fault.
The deactivation of this output always coincides with the “OL” (out of
lock) control head display.
Note

During channel change, although the synthesizer has to re-synchronise with the new channel frequency, this output will not be
temporarily deactivated.

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Timing

The maximum time out of lock before this action is activated (e.g. during
channel change) is 50ms.

Description

When the radio detects a change of the synthesizer lock detect state, the
radio sets the state of this output line to reflect the lock detect state. When
the synthesizer is locked, the output line is active. When the synthesizer is
not locked, the output line is inactive.

Related Actions

None.

3.2.5

Reflected PTT Status

Application

This action is used to report the PTT status by generating a logic OR of all
PTT sources programmed to reflect their status. The priority does not affect
the logic OR.

Configuration

In the PTT form, configure the ‘PTT State is Reflected’ check box
for each PTT type.

In the Programmable I/O form, configure an output line and
associate it with this action. Set the active state to be high or low (as
required).

Timing

The response time of this output line is less than 2ms.

Description

When the radio detects a change in PTT state, it sets the state of this output
line to reflect the PTT state. When any PTT state changes to active, the
output line is active. When all PTT states change to inactive, the output line
is inactive.

Related Actions

The external PTTs can be monitored directly by the external application.

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Programmable I/O Lines

3.2.6

External Alert 1 and 2

Application

These two output signals are used to indicate the reception of a call to an
externally connected device. The alert can be programmed to occur for
specific call types.
The AUX_GPIO4 line of the auxiliary connector can be fitted with a power
MOSFET in order to connect signal indicators directly to the radio
(e.g. flashing light, buzzer, horn relay). With the other GPIO lines, if no
power MOSFET is fitted to the AUX_GPIO4 line, the signal characteristics
specified in “Description of the Radio Interfaces” apply.
Two different external alert types (external alert 1 and 2) can be specified,
and either none, external alert 1, external alert 2 or both can be activated.
For more information on external alerts refer to the online help of the
programming software.

Configuration

If you want to connect to an external alert device such as horn or
lights relay, follow the instructions in “Connecting an External Alert
Device” on page 129.

Configure AUX_GPIO4 (when connection to an external alert
device) or any other output line and associate it with this action.
Set the active state to be high or low (as required).

On the Alerts form, configure external alert 1 and/or 2 (delay,
duration, mode).

Note

When programming this output line for TM8200 radios, the
‘Mode’ field can be used to define different ring patterns and
assign priorities for each call type.

Timing

The timing of the external alert signal activation and deactivation is
determined by the settings in the programming application.

Description

When the radio receives a call (individual call 1 or 2, priority call, group call
or emergency call), which goes unanswered for the specified amount of
time, the radio indicates the incoming call to the external device via the
output line according to the currently programmed settings for the call alert
function.
When the call is answered (i.e. external PTT activated or PTT pressed), the
radio will stop indicating the incoming call to the external device.
Note

Related Actions

Once the external alert function has been configured, it has to be
manually activated by the user (via function key or radio menu),
or the line will not activate when a call is received. If the radio is
powered off then on again, the user has to activate the external
alert function again.

None.

Programmable I/O Lines

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3.2.7

Public Address Status

Application

Activates the output line when the radio is in public address mode and a
PTT is active (pressed).
The line will deactivate when the line is no longer active (released).

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).
Note

If using the Tait Public Address Board, this action must be assigned
to IOP_GPIO2, and Active set to high.

Timing

The response time for both activation and deactivation is approximately 2ms
plus debounce time.

Description

When the radio is in Public Address mode, the radio PTT state changes from
off to on (caused by highest priority PTT), and the nominated output line
is activated.
When the radio exits Public Address mode, or when the radio PTT state
changes back to off, the output line is deactivated.

Related Actions

3.2.8

None

Reflected PTT Inhibit Status

Application

This output signal is used to report the current PTT inhibit status by
generating a logic OR of all PTT sources programmed to reflect their status.
The priority does not affect the logic OR.

Configuration

In the PTT form, configure the ‘PTT Inhibit State is Reflected’
check box for each PTT type.

In the Programmable I/O form, configure an output line and
associate it with this action. Set the active state to be high or low (as
required).

Timing

The response time of this output line is less than 2ms.

Description

When the PTT inhibit status changes from on to off, or from off to on, this
status is reflected on the output line.

Related Actions

The ‘Inhibit PTT’ input signal is used to stop any current PTT
transmissions, return to receive state and inhibit any further PTT
transmission requests.

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Programmable I/O Lines

3.2.9

Reflect THSD Modem Status

Application

Asserts the output line whenever the THSD modem has been activated, and
the radio is in THSD transparent mode. The radio can enter the THSD
transparent mode via the programmable input ‘Activate THSD Modem’,
the Powerup State, or a CCDI command. The line will deactivate when the
radio exits THSD transparent mode.

Configuration

In the Programmable IO form select the Digital tab.

Select a GPIO pin which is to reflect the state of THSD activity

Set the Direction field to Output.

Set the Action field to Reflect THSD Modem Status.

Set the Active output state to either High or Low.

Timing

The output is asserted within 1ms of entering THSD transparent mode.

Description

When configured to Reflect THSD Modem Status, the output line will go
to the selected Active state when THSD transparent mode is entered. The
output line will go back to its inactive state when THSD transparent mode
is exited.

Related Actions

None

3.2.10

Signalling Audio Mute Status

Application

This output signal is used to indicate valid traffic on a channel (e.g. to
quieten a car stereo).

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Timing

The response time of this output line is less than 2ms.

Description

If the radio receives a carrier and either signalling is valid or the monitor is
active, this output line becomes active.
If the radio receives a carrier, and the channel is not programmed to have
signalling, this output line becomes active.
Any condition that would cause audio mute to close will cause deactivation
of this signal.

Related Actions

The ‘Busy Status’ output signal also detects the carrier but ignores signalling.

Programmable I/O Lines

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3.2.11

Radio On Traffic Channel

Application

Activates the output line when the radio is on a voice or data traffic channel.
The line will deactivate after the call ends.

Related Actions

This is the MPT trunked equivalent of “Signalling Audio Mute Status” on
page 82.

3.2.12

On Data Traffic Channel

Application

Activates the output line when the radio is on a traffic channel and ready to
send or receive data. The line will deactivate when the call ends.

Related Actions

“Radio On Traffic Channel” on page 83

3.2.13

Monitor Status

Application

This output signal is used to indicated the state of the monitor function.
This allows an external application to determine whether the user has
activated the monitor.
Note

This output line only indicates the monitor function and not the
hookswitch monitor function.

For more information on the monitor function refer to the user guide and
the online help of the programming application.
Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Timing

The response time of this output line is less than 2ms.

Description

When the radio detects a change in state of the monitor function, the radio
sets the state of this output line to reflect the state of the monitor function.
When monitor is active, the output line is active. When monitor is inactive
the output line is inactive.

Related Actions

The ‘Hookswitch Status’ output signal indicates the state of the hookswitch.

3.2.14

Hookswitch Status

Application

This output signal is used to indicate the state of the hookswitch.

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

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Programmable I/O Lines

Timing

The response time of this output line is less than 2ms.

Description

When the radio detects a change in state of the hookswitch, the radio sets
the state of this output line to reflect the state of the hookswitch. When the
hookswitch is off the hook, the output line is active. When the hookswitch
is on the hook, the output line is inactive.

Related Actions

None.

3.2.15

Call Setup Status

Application

This output signal is activated when the radio is busy in a voice call.
It remains active as long as the call is in progress, and may be used to trigger
an application such as a voice recorder, or to quieten external audio
equipment during the call.

Configuration

Configure an output line and associate it with this action. Set the
active state to be high or low (as required).

Configure the Monitor function to activate on both call reception
and call initiation. Set the Monitor Auto-Quiet timer to minimise the
chance of turning the Monitor off in the middle of a call.

Timing

The call setup status signal will respond within 2ms of monitor activation
during call setup or reception.

Description

This output signal is activated when the monitor function is activated by
either a call setup or call reception.
The signal will be deactivated when the call is finished i.e. when the monitor
is deactivated again due to auto-quiet tomato or reset signalling.
Note

Related Actions

3.2.16

The monitor function does not get activated if the call is determined to be non-voice e.g. contains a control status.

None.

Radio Idle

Application

Activates the output line when the radio is idle and ready to accept an
incoming or outgoing call request. The line will deactivate when the radio
is no longer idle (for example, is involved in a call).

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Related Actions

This is the MPT equivalent of “Call Setup Status” on page 84.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

3.2.17

Control Status Rx (Line 1 to 3)

Application

These three output signals indicate that a call has been received which
contains a pre-defined status code, causing the signal to either activate or
deactivate. Up to three separate signals may be defined, each having unique
activation and deactivation status control codes.
These outputs may be used in Simple Telecommand type systems to
remotely control application devices by radio command. Example
applications might include remote activation or deactivation of outstation
equipment (beacons, pumps, generators etc.) from a central control point.

Configuration

Set up the radio to operate with Selcall on the intended operating
channel.

Set an alert and/or a delay (in Detailed tab of the Selcall / Selcall
Identity form).

Define the required control status values to activate and deactivate the
desired control status signal (in the Selcall / Control Status form). For
TM8200, define alpha labels in the Status Labels form.

Configure an output line and associate it with this action. Set the
active state to be high or low (as required).

Note

The signal state of this signal can be set to latching only.

Timing

The control status signal will respond within 2ms of receiving the last digit
of the call sequence. If an alert and/or delay is configured, 500 ms for the
alert and/or the programmed delay will be added to the response time.

Description

The output signal is activated upon reception of a valid Selcall sequence
containing the pre-defined control activation status value.
The signal remains active until another valid Selcall sequence is received
which contains the pre-defined control deactivation status value.

Related Actions

None.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

3.2.18

SIBT Received

Application

This output signal indicates reception of a defined audio band (single inband) tone.
This signal might be used to alert an application device to the presence of a
pilot tone prior to other traffic being received.

Configuration

Set up the radio to operate with single in-band tone signalling on the
intended operating channel.

Configure the single in-band tone parameters: tone frequency,
minimum duration, and tone hold time

Configure an output line and associate it with this action. Set the
active state to be high or low (as required).

The output signal response time is dominated by the settings of minimum
tone duration and tone hold time.

Timing

Note

The detection response time may lengthen if the S/N of the
incoming signal is poor.

This output signal is activated once the presence of the pre-defined in-band
tone has been detected for the configured minimum duration.

Description

The signal will remain active until the tone has not been detected for the
duration of the configured tone hold time.
Related Actions

3.2.19

None.

Radio Stunned

Application

This output signal is used to indicate whether the radio has been stunned by
receiving a Selcall containing a control status set to full stun or Tx stun. This
can be used to indicate to external applications that the radio is unusable, or
it can be used to control an external device to disable other equipment.

Configuration

Configure an output line and associate it with this action. Set the active state
to be high or low (as required).

Timing

The response time of all output lines is less than 2ms after the last tone in
the sequence was received.

Description

When the radio becomes stunned, this output line becomes active.
When the radio is revived, this output line becomes inactive.

Related Actions

None.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

3.2.20

F1 to F4 Key Status

Application

These output signals are used to reflect the press of function keys on the
control head. The actions can be programmed to be either:
■

momentary – reflects the state of the function key (active when the
function key is pressed, inactive when the function key is released)

■

latching – one short press of the function key activates the output line,
which then stays active until next short press of function key

These signals allow user interaction with an application device.
Configuration

Note

Program any function to the function key (including ‘None’).
The function key LED will reflect the function key state.
If the function key is programmed to ‘None’ and an output line
has been configured to reflect the function key state, the LED
associated with this function key will not be affected.

It is recommended that the key be configured to Action Digital
Output Line (Key Settings form), in order for the corresponding LED
to reflect the key status.

Configure an output line and associate it with this action. Set the
active state to be high or low (as required).

Configure the signal state to be either momentary or latching.

Timing

The response time of this output lines is less than 50ms.

Description

When the relevant function key is pressed, the output line becomes active.
Depending on the programmed mode, the output line remains active until
the function key is released (momentary) or until the next key press
(latching).

Related Actions

The ‘Simulate F1 to F4 Key’ input signals are used to simulate the press of
function keys on the control head. Both short and long key presses can be
simulated.
The ‘Toggle F1 to F4 Key LED’ input signals are used to turn the LEDs of
the control head on and off for display purposes, e.g. for key functions that
have no LED assigned.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

3.2.21

FFSK Data Received Status

Application

This output signal indicates that the internal 1200 baud modem is detecting
valid FFSK signalling i.e. indicating data reception.
This signal might be used to alert application devices to the presence of data.

Configuration

Timing

Configure the radio to expect FFSK data. On the Data form, check
either the CCDI Options/Transparent Mode Enabled checkbox or
the SDM Options/SDM Enabled check box.

Configure an output line and associate it with this action. Set the
active state to be high or low (as required).

The output will indicate the presence of FFSK data within 2ms of the
preamble/sync sequence being successfully decoded. Note that the
preamble/sync sequence is 32 bit periods long (approximately 27ms
duration).
The output will indicate the absence of FFSK once the channel is no longer
busy.

Description

The output is activated when the radio successfully decodes an FFSK
preamble/sync sequence.
Important

Related Actions

The output will remain active as long as the channel
remains busy (even if FFSK signalling disappears) and will
become inactive once the incoming transmission ceases.

None.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

3.2.22

CTS Control (DCE)

Application

Sets the output line on the radio for hardware flow control (handshaking).
DCE stands for data communication equipment, and refers to the radio. The
data terminal equipment (DTE) activates this line to indicate that it is ready
to send serial data from the radio.
Note

Configuration

If this action is assigned to a pin, the CTS field will be automatically updated.

Configure Serial Communications - Flow Control in Command
Mode and/or Transparent Mode for “Hardware”.

Select Hardware Flow Control I/O Pins for both CTS (DCE) and
RTS (DCE).

Configure Active Low/High for RTS and CTS.

Configure Debounce Time for RTS and CTS.

Timing

Not applicable

Description

The radio activates the CTS control line (DCE) to indicate the third party
device (DTE) that it is ready to receive serial data on the associated RXD
line of the radio.

Related Actions

‘RTS Control (DCE)’ sets the input line on the radio for hardware flow
control.

3.2.23

Ready For NPD

Application

Activates the output line when the radio is able to set up a data call, or is on
a data traffic channel. The line will deactivate when the radio is unable to
transmit data over-the-air from the terminal equipment (for example,
during a hunting or a call setup procedure).

Related Actions

This is the MPT trunked equivalent of “CTS Control (DCE)” on page 89.

3.2.24

Serial Data Tx In Progress

Application

Sets the output line active when sending data out of the serial port. This can
be used to control simplex RS485 and RS422 drivers.

Configuration

Configure an output line and associate it with this action.

Timing

The output line will become active 2ms before the data is sent.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

Description

Sets the output line active for data to transmit over serial port. Becomes
inactive when data is no longer available to send.

Related Actions

Used for CCDI/CCR control in two-wire simplex mode.
Note

3.2.25

Simplex control may miss data due to nature of action.

Radio Ready

Application

Activates the output line when the radio is powered up and fully initialised
in either conventional mode or trunked mode.

Configuration

Configure an output line and associate it with this action.

Timing

The output line will become active when the radio is fully initialised.
The line will deactivate when the radio powers down, or during a change
of mode.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

3.3

Audio Tap In and Tap Out Lines
This section describes the general design principles for use of the
programmable audio tap in and tap out lines.

Audio Tap Point
Philosophy

The radio provides the ability to input and output audio at various tap points
in the transmit and receive audio paths. This removes the need of tapping
wires into the circuitry of the radio. The tap points and the type of tap are
programmed into the radio and cannot be modified by the radio user.

Available Audio
Tap In and Tap Out
Lines

The following lines are available to tap into and tap out of the audio paths:
Table 3.10 Audio tap in and tap out lines

Signals

Connector

Direction

AUD_TAP_IN

auxiliary connector
input only
internal options connector

AUD_TAP_OUT

auxiliary connector
output only
internal options connector

For details on the connector pin-outs and electrical characteristics of these
lines refer to “Description of the Radio Interfaces” on page 13.
Input/Output
Circuitry

Figure 3.12

Figure 3.12 shows a simplified circuit diagram of the audio tap in and tap
out lines. Protection circuits are not shown.
Audio tap input and output - simplified circuit diagram
Full-scale output level
(no load)
4.3V

DSP
audio
path

digital-toanalog
converter

12kHz
LPF

600
AUD_TAP_OUT

buffer

0.3V

3.3V

Full-scale input level
2.5V

220k
DSP
audio
path

analogto-digital
converter

22kHz
LPF

3.7Hz
HPF

2.3V

AUD_TAP_IN
180k

1.5V
0.5V

The signal source for the audio tap out line comes from the DSP audio path
(refer to Figure 3.14 for details) and is fed to a digital to analog converter at
48000 samples per second. The converter output is low pass filtered at
12kHz to remove alias components and fed to a buffer amplifier. The buffer
amplifier output is DC coupled to the AUD_TAP_OUT line and has a DC
offset of nominally 2.3V. The DC offset is affected by Rx carrier frequency
error for taps R1, R2 and R4. Full scale output level is nominally 4Vp-p
with no load (for more information refer to “Auxiliary Connector” on

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

page 19). The buffer amplifier has an output impedance of nominally 600Ω
that is constant across frequency.
The audio tap in line is also DC-coupled. A DC bias network provides a bias
of nominally 1.5V. The valid DC input signal range is 0.5 to 2.5V nominally
regardless of bias voltage. Therefore, to avoid asymmetrical clipping and
reduced dynamic range, it is important that the input bias voltage is
preserved when driving the input. This can be achieved by simply ACcoupling the drive signal. For data applications, DC-coupling may be
desirable so, in this case, the driver must provide a DC bias signal as close as
possible to 1.5V. After input biasing, the AUD_TAP_IN signal is fed to a
switched capacitor high-pass filter with a cut frequency of 3.7Hz.
This prevents the DC bias affecting the transmitter carrier frequency.
The high-pass-filtered signal is then low-pass-filtered to prevent aliasing,
and sampled by an analog-to-digital converter at 48kHz. The analog-todigital converter output is then fed to the DSP audio path (refer to
Figure 3.14 for details)
For some applications, such as a crossband link or fitting an encryption
module, it is necessary to connect the audio tap out line to the audio tap in
line. The two are not directly compatible but can be made so using a simple
external coupling network as shown in Figure 3.13.
Figure 3.13

Connecting audio tap out and audio tap in

radio

external
coupling
network

radio
3.3V

220k
600
buffer

AUD_TAP_OUT

600

AUD_TAP_IN

3.7Hz
HPF
180k

The 600Ω shunt resistor reduces the maximum level of audio tap out to
nominally 2Vp-p to match the maximum input level of audio tap in.
The coupling capacitor removes the DC offset. For voice applications,
CC should be at least 100nF. If high-speed baseband data modulation
throughput is required, CC of at least 4.7µF is recommended. The CC
capacitor should be a non-polarised type.

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Figure 3.14 shows a simplified block diagram of the receive and transmit
audio paths, the locations of the tap points available, and the tap types.

Audio Paths

Figure 3.14

Receive and transmit audio paths - simplified block diagram

audible
indicators

receive audio path
R1
receiver
demodulator
output

3kHz
LPF

deviation
normaliser

300Hz
HPF

R10

deemphasis

future
processing
option

audio to
volume
control
and speaker

transmit audio path
T13
audio to
transmitter
modulator

T12
dev.
scaler

3kHz
LPF

limiter

300 Hz
preemphasis
HPF

future
processing
option

T3
future
processing
option

ALC
mic
audio

Key:
tap point (tap in or tap out)

tap types:
type A
Bypass In

LPFlow-pass filter
HPFhigh-pass filter

type B
Combine

type C
type D
Bypass Out Split

type E
Splice

ALCauto level controlled

Audio
Configuration

Audio Source

The audio configuration consists of the following elements:
■

audio source associated with each PTT (CH_MIC_AUD,
AUX_MIC_AUD, AUD_TAP_IN)

■

Rx/PTT type (Rx, Mic PTT, EPTT1, EPTT2)

■

tap out point (R1, R2, R4, R5, R7, R10, T3, T4)

■

tap out type (C-Bypass Out, D-Split, E-Splice)

■

tap out unmute condition

■

tap in point (T3, T4, T5, T8, T9, T12, T13, R7, R10)

■

tap in type (A-Bypass In, B-Combine, E-Splice, H-Combine 0dB)

■

tap in unmute condition

For each PTT (Mic PTT, EPTT1 and EPTT2) a different audio source can
be selected. These audio sources are CH_MIC_AUD, AUX_MIC_AUD
and AUD_TAP_IN.
Note

You can allocate an audio tap input at the same time as a microphone input by setting the audio source for a PTT to
CH_MIC_AUD or AUX_MIC_AUD, and defining a tap in and
out point for the same PTT. However, audio samples from the
audio tap input will overwrite those from the microphone input,
unless the tap in type and tap out type are set to ‘Combine’.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

Rx/PTT Type

The radio can be programmed to tap into and out of the respective audio
path when the radio is receiving or transmitting (initiated by one of the
PTTs).

Tap Out and Tap In
Points and Types

Table 3.11 lists the available tap points and the tap types available for them.
The tap points and tap types are illustrated in Figure 3.14.
Select a tap out point to feed audio to an application device, and a tap in
point to feed audio from an application device.
Important

Do not use ‘Bypass Out’ on R1, R2 and R4 with subaudible or inband signalling schemes, as this may prevent correct
operation of the signalling decoder.

The same tap point can be selected for both tap in and tap out. This is
referred to as a ‘Splice’ tap type as it allows an audio processing device to be
inserted into the radio’s audio path. This tap type is primarily used for
encryption applications (refer to “Encryption Module (Scrambler)” on
page 119).
The ‘Combine’ tap type is intended for the injection of sidetone beeps into
the Rx path.
Important

Programmable I/O Lines

Modifications to radio-frequency transmitting equipment
can void the user's authority to operate the equipment.
By distributing the TM8000 3DK Hardware Developer’s
Kit, Tait Electronics Limited. does not accept liability for
any non-compliance or infringement of intellectual property rights resulting from the application or use of this kit
or information. Any person modifying Tait radio-frequency transmitting equipment is responsible for ensuring
that the modified equipment meets all legal and regulatory
requirements in the country of use or supply.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Table 3.11 Tap out points and tap out types

Rx/PTT type
Rx

Tap in
points

Tap In and Tap Out
Unmute

Tap out
points

Tap out
types

E - Splice

C - Bypass Out
D - Split

R10

A - Bypass In
B - Combine

C - Bypass Out
D - Split

C - Bypass Out
D - Split
E - Splice

R10

C - Bypass Out
D - Split

A - Bypass In

C - Bypass Out
D - Split

E - Splice

A - Bypass In

R10

C - Bypass Out
D - Split

A - Bypass In

T12

A - Bypass In

T13

A - Bypass In

R10

A - Bypass In
B - Combine

PTT, EPTT1, EPTT2 T3

Note

Tap in
types

If a tap type is set to ‘Splice’, then the corresponding tap in or tap
out type must also be set to ‘Splice’. Both tap points and both
unmute conditions must also be identical.

For the Rx path, the settings for unmuting the tap in and the tap out points
are:
■

Busy Detect

■

Busy Detect and Subaudible

■

Rx Mute Open

■

Except on PTT (not available for tap type E - Splice)

For all PTT types, the only setting for unmuting the tap in and the tap out
points is On PTT
Applications

For application examples refer to:
■

“External Modem” on page 110

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Programmable I/O Lines

■

“Encryption Module (Scrambler)” on page 119

■

“ANI Module” on page 125

Programmable I/O Lines

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Creating Your Own Options Board
TM8100 and TM8200 radios provide space for the following options
boards:
■

an internal options board inside the radio body using the internal options
connector and (optional) the hole provided for the external options
connector

■

a blank control head options board (TM8105 only) between the radio
body and the blank control head using the control head connector

This chapter describes the mechanical envelopes of these options boards,
common design practices and EMC guidelines and the Internal Options Kit
available from Tait.
Important

4.1

Modifications to radio-frequency transmitting equipment
can void the user's authority to operate the equipment.
By distributing the TM8000 3DK Hardware Developer’s
Kit, Tait Electronics Limited. does not accept liability for
any non-compliance or infringement of intellectual property rights resulting from the application or use of this kit
or information. Any person modifying Tait radio-frequency transmitting equipment is responsible for ensuring
that the modified equipment meets all legal and regulatory
requirements in the country of use or supply.

Internal Options Board
TM8100 and TM8200 radios provide space inside the radio body to
accommodate an internal options board.
The internal options board is connected to the internal options connector
and can also use the hole provided for the external options connector.
The internal options connector is described on page 27.
The provision for the external options connector is described on page 30.
Examples of internal options boards available from Tait:
■

TMAA30-02 3DK Application Board.
Refer to the TM8000 3DK Application Board Service Manual.

■

TMAA01-01 Line-Interface Board.
Refer to the TM8100/TM8200 Service Manual.

■

TMAA01-05 Options Extender Board.
Refer to the TM8100/TM8200 Service Manual.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Creating Your Own Options Board

4.1.1

Mechanical Envelope
Figure 4.1 and Figure 4.2 show the mechanical envelope available for
internal options boards. Nine screw points are provided on the inside of the
lid of the radio body.
Internal options boards can be sized and shaped as required and can use any
combination of fixing parts to suit. Figure 4.3 shows an installation example.
Note

Figure 4.1

Unless stated otherwise, all dimensions are given in millimetres.

Internal options board - maximum dimensions
139
61
54
42.07
26.665 centre of connector
12 centre of connector

Ø 3.5 (9x)
pin 1

87.5
99

15
29.5 centre of connector
46
55.5

1.5
5.5

0.4

11.26
4

10.2

R7
R2

top side
4
10.62
12
62
108
132
143

Creating Your Own Options Board

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Figure 4.2

Internal options board - component height restrictions
max. comp. height 10.7mm
66.5

unshaded areas (12x) = no routes
no components

10.18

6.17

44.57

70.26

18.4

70.26

.5
R6

15.4

16.09

10.79

Ø 10 (5x)

15.43
32.26
44.57

9.02

1.98

15.45

9.52

max. comp. height 9.5mm
max. comp. height 6.7mm

9.02

42.29
31.24

11.93

1.05

11.4

.16
R5

1.6

1.6
8.42
9.14

8.42
max. comp. height 7.7mm 9.16

max. comp. height 8.2mm
44.88

max. comp.
height 7.7mm

53.23

44.88

top side

126.01
110.52

unshaded
areas (9x)
= no routes
throughhole
components
allowed on
top side
max. leg length
2mm from
bottom side

14.5

46.5

86.6

Ø 7.8 (12x)

no through-hole components
on top side

maximise ground plane over bottom side
no components on bottom side

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

60.5

bottom side

Creating Your Own Options Board

Figure 4.3

Internal options board - installation example

Important

Assemble and tighten the two hexlocks (tightening torque
0.9N·m=8lbf·in) before screwing the internal options board to
the lid.

b
c

F
G
G

H
I
Note

The labelled parts are available with the TM8000 internal options kit
described on page 101.

D-range hexlok-style fastener 4–40 (2x)
(tightening torque 0.9N·m=8lbf·in)

c
d
E

screw 4-40x3/16 (2x)

100

protective rubber cap

f
G
H
I

screw M3x10, self-tapping (9x)
loom with 18-way Micro-MaTch plugs
15-way high-density D-range socket, PCB-mount
18-way Micro-MaTch socket, SMD, PCB-mount

foam seal for D-range connector

Creating Your Own Options Board

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

4.1.2

TM8000 Internal Options Kit
The TM8000 internal options kit (product code TMAA30-06) includes all
special connectors, a loom, seals and screws required to connect to the
internal options connector, the external options connector and the screw
points inside the radio body.
The components of the TM8000 internal options kit, that are fitted to the
radio, are illustrated in Figure 4.3.

Table 4.1

TM8000 internal options kit - bill of material

Tait IPN

Qty.

Description

Pos. in Figure 4.3

b
c
d
E
f
G
H
I

354-01043-00

Fsnr Scrw Lok 1pr 4-40

347-00011-00

Scrw 4-40*3/16 Unc P/P Blk

362-01108-00

Seal Drng Cvr 9way TMA

362-01111-00

Seal Drng 9way TMA

349-02062-00

Scrw M3*8 T/T P/T Conti Rmnc

219-00329-00

Loom TMA Int Opt

240-00011-67

Skt 15w Drng Ra Slim Dsub 7912 (footprint see Figure 4.4)

240-10000-11

Conn SMD 18w Skt M/Match (footprint see Figure 4.5)

240-00010-80

Plg 15w Drng Hi-D

not illustrated

240-06010-29

Conn 9w Hood/Cvr Lets

not illustrated

Figure 4.4

Footprint of 15-way D-range socket, PCB-mount
0.13
2.5
1.5

1.8
2.0

Ø0.8

Ø2.1

6 11 2 8 13 4 1015
1 7 12 3 9 14 5

0.762
1.524
10.67
16.0
24.99

Ø3.18
7.03

Figure 4.5

Ø1.8
7.29

Footprint of 18-way Micro-MaTch socket, SMD, PCB-mount
26.2
21.6
3

2.8

4.6
5.1

1.3

height: 8.2mm (incl. mating connector)

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Creating Your Own Options Board

101

4.1.3

Common Practices for Internal Options Board Design

Thermal
Considerations

Select components which withstand the temperatures inside the radio body,
in particular during high duty cycles and high ambient temperatures.
Tait recommends the use of industrial-grade components (<85°C).
Heat dissipation added by an internal options board can reduce the radio’s
operating temperature range or duty cycle. Keep heat dissipation to a
minimum.

Sealing

The IP54 protection class no longer applies when the external options
connector or an additional connector are used. When fitting one of these
connectors, it is the integrator’s sole responsibility to provide adequate
sealing.

Electromagnetic
Compatibility

It is important that the internal options board is electro-magnetically
compatible (EMC) with the radio itself and the external environment.
This means that the internal options board is not affected by and does not
interfere with the radio or the external environment. An EMC problem has
three components: a source, a coupling mechanism and a receiver.
The coupling mechanism can be conducted and/or radiated.
Key things to consider are as follows:

Susceptibility to
Interference

If the internal options board has connections via the external options
connector and the radio’s antenna is located close to the options cable,
significant RF pick up on to the cable may occur.
If the internal options board contains sensitive analog circuits (particularly
microphone circuits), digital ground noise may be a problem if the internal
options board is not earthed correctly.
Electrostatic discharge (ESD) onto the options cable may cause damage to
the internal options board or malfunction if proper protection is not
provided.

Emissions from the
Internal Options
Board

The radio's receiver is extremely sensitive and radiation from the internal
options board on the desired channel frequency may cause interference.
If the internal options board has connections via the external options
connector and the radio’s antenna is located close to the cable, radiation
from the cable may be picked by the antenna as interference.
Radiation from the options cable, if strong enough, may interfere with other
devices near the radio or cause failure to comply with EMC regulations in
your country or region. The cable creates a good antenna at high
frequencies.
Follow the guidelines in “Guidelines for EMC Design” on page 103.

102

Creating Your Own Options Board

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

4.1.4

Guidelines for EMC Design
Figure 4.6 and Figure 4.7 show the recommended earthing of the internal
options board. The earthing used depends on the type of circuitry on the
internal options board.

Earthing

Figure 4.6

Internal options board - earthing for low-speed circuits

internal
options
connector

regulated
PSU

DVDD

screws
(earth board
to chassis)

AVDD

13V8_SW

from PSU

DVDD

from digital

low-speed
digital
circuit

DGND

to digital

located as close to
the connector
as possible
470
25V

470p

25V

470p

digital ground
analog ground
chassis ground

external
options
connector

digital
device

4.7k

AVDD

from audio

470

analog
circuit
(low freq.)

AGND

to audio

analog
device

10n
4.7k

loom

radio ground plane

Figure 4.7

10n

internal options board
(2 layers with no groundplane)

options
cable

Internal options board - earthing for high-speed circuits

internal
options
connector
from PSU

regulated
PSU

screws
(earth board
to chassis)

AVDD

13V8_SW
DVDD

from digital
DGND

to digital

470
470p

from audio

highspeed
digital
circuit

located as close to
the connector
as possible
470
25V

470p

25V

470p

to audio
loom

AVDD

analog ground
chassis ground

external
options
connector

digital
device
options
cable

internal options board
(4 or more layers)

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

digital ground

4.7k

analog
circuit
(RF)

AGND

radio ground plane

DVDD

additional
coaxial
connector

analog
device

Creating Your Own Options Board

103

For low-speed digital designs or audio designs, a two layer board with plated
through holes is usually sufficient. Low-speed digital devices have relatively
long rise and fall times, this includes standard CMOS logic gates and low
power 5V 8-bit micro-controllers. Tracked earthing is usually sufficient but
ground fill should be used where possible.
For high-speed digital designs or RF designs it is strongly recommended that
a PCB with four or more layers is used. High-speed digital devices have
short rise and fall times, this includes most Digital Signal Processors and 16/
32-bit micro-controllers. The board should have one layer reserved as a
ground plane. No signal tracks should be placed on this layer.
The internal options connector has separate analog and digital earth pins.
These are connected together on the radio PCB through a low impedance
ground plane. Separate ground signals allow digital I/O and analog ground
current to flow in different wires on the loom. This is important because the
loom wire has relatively high impedance and so significant earth noise
voltage due to digital I/O activity can be developed across the length of the
wire. Having two earth wires also halves the impedance of the earth
connection where the earths are common at the internal options board end.
On the internal options board, the earth signals can either be connected
together or kept separate and fed to the appropriate digital and analog
circuitry. For low-speed designs it is practical to keep them separate but for
high-speed design this is not usually the case, due to ground plane
requirements.
It is recommended that the internal options board is earthed to the chassis
lid as close as possible to the external options connector. This can be
achieved via the mounting screws closest to the external options connector.
For the screw hole, use a plated through hole diameter 3.5mm with pad
diameter 7mm on both sides. The resist should be cleared from the pad and
the pad connected to analog earth or the ground plane. Other mounting
screws may also be connected to the chassis lid but this is not essential.
Shielding

For low-speed designs shielding is usually not necessary. For high-speed
designs shielding may be necessary. For RF designs it is usually essential.

Cable Shielding

If the external options cable is longer than 1 metre it is recommended that
the cable and connector backshell be shielded. Figure 4.8 shows the
recommended shielding arrangement. The earth braid wire (bare copper)
and aluminium foil should only be earthed at the radio end of the cable.
For RF signals, coaxial cable must be used and the shield must be earthed at
both ends of the cable.

104

Creating Your Own Options Board

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Figure 4.8

Recommended auxiliary cable and connector shielding

metal D-range shroud in
contact with backshell
metal backshell
signal earth wire
cable insulation

aluminium foil
metal cable clamp
earth braid wire
analogue ground pin

Input/Output
Filtering

The recommended filtering for input and output (I/O) lines from the
internal options board is shown in Figure 4.6 and Figure 4.7 on page 103.
The component values shown are for guidance but should be suitable for
most applications.
For the I/O lines to or from the radio, filtering is usually not necessary.
The exception is when the internal options board contains high-speed
digital circuits. In this case, the outputs to the radio should be RC-filtered
on the internal options board as close as possible to the connector to
minimise noise on the loom.
It is recommended that filtering is applied on all I/O signals of the external
options connector. They also need ESD protection. The filtering shown in
Figure 4.6 and Figure 4.7 on page 103 provides both ESD protection and
high frequency filtering. For the audio, 10nF capacitors are recommended
because they are large enough to keep the voltage developed by electrostatic
discharge to a safe level, while not significantly affecting audio frequency
response. The capacitors are earthed to the chassis to provide a low
impedance return path for large ESD currents. High frequency filtering is
provided by the series resistance and 10nF capacitor.
Large decoupling capacitors cannot be used for digital signals because they
round the wave form edges to an unacceptable extent. Therefore for ESD
protection, a small 470pF decoupling capacitor in parallel with a zener diode
clamp is recommended. The capacitor reduces the slew rate of the ESD
pulse so that the zener diode clamps without overshoot. Again, the capacitor
and zener diode are earthed to the chassis to provide a low impedance return
path for large ESD currents. It is also recommended that a zener diode is
placed on the digital supply, as some current will flow back into the supply
via the series resistance and digital IC clamping diodes during an ESD event.
The zener voltage should be approximately 0.5V higher than the supply
voltage. High frequency filtering is provided by the series resistance and
470pF capacitor.
It is essential that all I/O filter components are located as close as possible to
the connector. This minimises the possibility of noise bypassing the filters.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Creating Your Own Options Board

105

Power Supply
Decoupling

Power supply decoupling is most effective when the decoupling is placed
close to the load. For high-impedance loads, some resistance in series with
the load can be beneficial. For most applications a single 100nF capacitor is
sufficient to remove high-frequency noise.
For high-speed digital designs, the use of a power plane for each digital
supply rail is strongly recommended. The power plane enables many
decoupling capacitors and device power pins to be connected together with
very low impedance. The inter-plane capacitance is usually not sufficient by
itself for decoupling. Low ESR tantalums for low-frequency decoupling are
recommended. Multiple ceramic 100nF capacitors are recommended for
high-frequency decoupling. Design analysis should be undertaken to ensure
that decoupling is effective up to at least 500MHz.
Separate power supply rails for digital and analog circuitry are
recommended.
Note

106

High-speed digital design requires a high level of design experience, appropriate design tools and high bandwidth test equipment
to be successful. This should not be undertaken without all of the
above.

Creating Your Own Options Board

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

4.2

Blank Control Head Options Board
The radio with blank control head provides space between the blank control
head and the radio body for accommodating an options board. Six screw
points are located on the inside of the blank control head.
Figure 4.9 and Figure 4.10 show the mechanical envelope available.
Six screw points are located on the inside of the blank control head.
Figure 4.11 shows an installation example.

Figure 4.9

Blank control
1 head options board - maximum dimensions
Ø 3.4 clearance for M3x8 screw (6x)

.11

bottom side
9.74
69

43.61

33.39

pin 1 for a
placed D-range
type connector

70.5
75.61
149.72 max.

Figure 4.10

5.11

11.15

Blank control head options board - component height restrictions
unshaded areas
= no routes

max. component height 5.0mm

Ø 10 (6x)

bottom side
max. component height 13.0mm
max. component height 8.0mm
max. component height 6.0mm

Ø 10 (6x)

max. component height 5.0mm

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

top side

unshaded areas
= no routes

Creating Your Own Options Board

107

Figure 4.11

Blank control head options board - installation example

b
c

g
h
b

D-range hexlok-style fastener 4–40 (2x)
(tightening torque 0.45N·m=4lbf·in)

c
d
e

screw 4-40x3/16 (2x)

108

D-range cover seal

f
g

screw M3x8 plastic type (6x)

foam seal for D-range connector

9-way D-range socket, vertical PCB mounting
with threaded inserts on connector

branding label

Creating Your Own Options Board

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Connecting Third-Party Products
This chapter describes, in examples, the connection of external and internal
products of third-party manufacturers to the TM8000 radio.
Important

Modifications to radio-frequency transmitting equipment
can void the user's authority to operate the equipment.
By distributing the TM8000 3DK Hardware Developer’s
Kit, Tait Electronics Limited does not accept liability for
any non-compliance or infringement of intellectual property rights resulting from the application or use of this kit
or information. Any person modifying Tait radio-frequency transmitting equipment is responsible for ensuring
that the modified equipment meets all legal and regulatory
requirements in the country of use or supply.

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

Connecting Third-Party Products

109

5.1

External Products

5.1.1

External Modem
Figure 5.1 shows a simple point-to-point data link system using two radios
and external modems.

Data Flow

Figure 5.1

Basic system configuration using two external modems and radios

RF connector

radio
1

radio
connector

DTE
serial data
connector connector
external
modem
1

auxiliary
connector

DTE 1

RF connector

radio
2

radio
connector

DTE
serial data
connector connector
external
modem
2

auxiliary
connector

DTE 2

DTE 1 transmits the source data in serial form to the external
modem 1. The DTE can be a PC or a data head.

The modem encodes the data into a baseband modulation signal
which is suitable for over-the-air transmission, and feeds it to radio 1.

Radio 1 uses the baseband modulation signal for frequency
modulation of the RF carrier signal, and then sends the modulated
signal over the air (via a repeater, if necessary).

Radio 2 receives the modulated signal, recovers the baseband
modulation signal from the RF carrier, and then feeds the baseband
modulation signal to external modem 2.

External modem 2 decodes the baseband modulation signal into serial
digital form and feeds it to DTE 2.

DTE 2 can also be the source and DTE 1 the destination, however, because
the radios are simplex, simultaneous data flow in opposite directions is not
possible.

110

Connecting Third-Party Products

TM8100/TM8200 3DK Hardware Developer’s Kit Application Manual
© Tait Electronics Limited March 2006

The external modem is connected to the auxiliary connector, which is
described on page 19. For the interface specification of the external modem
to the DTE please refer to the manufacturer’s documentation.

Interface
Specification

Table 5.1 shows how to connect the lines of the external modem to the
auxiliary connector.
Table 5.1

External analog modem interface specification

External modem

Auxiliary connector

Signal

Description/parameter
Power

13V8_SW

Power supply to modem.
Max. current draw:
Operating voltage range:

Ground

AGND

Analog ground.

Baseband modulation
output

AUD_TAP_IN

Baseband modulation to radio.
Format1:
Audio tap input point:
Audio tap input muting:
Signal level:

DC bias required:
AUD_TAP_IN input impedance:
Baseband modulation
input

AUD_TAP_OUT

Baseband modulation from radio.
Format:

Carrier detect

AUX_GPI1

AUX_GPIO4

GMSK, FFSK, 4-level FSK
1200-9600baud
Use T13-A or T12-A for GMSK/4FSK
Use T8-A for low-baud modems.
Use ‘on PTT’ associated with EPTT1
T13-A: 870mVp-p (3kHz dev.)
T12-A: 690mVp-p (60% RSD2)
T8-A: 690mVp-p (60% RSD2)
1.5±0.2V3
100kΩ typical

AUD_TAP_OUT output impedance:
PTT signal to radio.
Function:
Active state:
Logic output levels required:

EPTT1 or EPTT2
Low
3.3V CMOS-compatible

Audio tap input muting:
Signal level into 600Ω:

must be <1A
9.7V to 17.2V

Constant envelope.
GMSK, FFSK, 4-level FSK
1200-9600baud
Use R1-D or R2-D for GMSK/4FSK
Use R4-D for low-baud modems.
Use ‘except on PTT’
R1-D: 600mVp-p (3kHz dev.)
R2-D: 690mVp-p (60% RSD2)
R4-D: 690mVp-p (60% RSD2)
600Ω typical

Audio tap input point

Push-to-talk

Specification

Signal

Carrier detect. Some modems may
not need this signal.
Function:
Active state:
Modem input logic threshold
required:

Busy status based on RSSI
High
3.3V CMOS-compatible4

1. The modulation formats listed may not comply with transmit spectral emission mask regulations in some countries. It is
the integrator’s responsibility to ensure that the system complies with the relevant regulations.
2. RSD = Rated System Deviation
3. While AUD_TAP_IN is DC-coupled, it has a digital HPF in the modulation path to prevent DC bias error affecting the
transmit carrier frequency. The HPF has a –3dB point of 3.7Hz which is low enough for GMSK. If the modem cannot
provide the bias voltage required then a large coupling capacitor, typically 10µF, should be used.
4. If the modem input is 5V CMOS, the pullup output on AUX_GPIO4 should be linked to 5V. For more information refer
to “Digital Output Lines” on page 70.

Connecting Third-Party Products

111

Use the programming application to configure the radio.

Radio Programming

In the Digital tab of the Programmable I/O form, carry out the
following settings:

Direction

Action

Active

Debounce

Signal state

AUX_GPI1

Input

External PTT1

Low

None

AUX_GPIO4

Output

Busy Status

High

None

Momentary

Rx /
PTT Type

Tap In

None

EPTT1

T13

In the PTT / External PTT (1) form, set the Advanced EPTT1
group to:
■

PTT Transmission Type: Data

■

PTT State Is Reflected: cleared

■

PTT Priority: Highest

■

Audio Source: Audio Tap In

In the Networks / Basic Settings / Basic Network Settings form,
set the Squelch Detect type to Signal Strength.

In the Audio tab of the Programmable I/O form, carry out the
following settings:

Tap In Type

Tap In Unmute

Tap
Out
R1

A - Bypass In

On PTT

Tap Out Type
D - Split

Tap Out Unmute
Except on PTT

None

Tap out R1 is the tap point closest to the demodulator. Tap in T13 is
the tap point closest to the modulator. For more information on the
tap points refer to “Auxiliary Connector” on page 19 and “Audio
Tap In and Tap Out Lines” on page 91.
If not all the channels that the modem will be communicating on
have the same channel spacing or bandwidth, tap in T12 and tap out
R2 should be used. The signal levels on these taps are automatically
scaled to match the channel spacing, i.e. 3kHz deviation on a 25kHz
channel and 1.5kHz deviation on a 12.5kHz channel will result in the
same tap in and tap out signal levels.
For modems operating at 2400baud or less, tap in T8 and tap out R4
should be used. These tap points have linear-phase 3kHz low-pass filtering applied.
5.

Modem
Configuration

112

All channels that the modem uses for communication should be
assigned to one network and all voice channels should be assigned to
a second network. This ensures that the data and voice channel
settings are independent of each other.

Refer to the manufacturer’s documentation.

Connecting Third-Party Products

Setup and Testing

System Delays
through the Radio

Configure the modem and DTE.

Test the modem and DTE configuration. The simplest means is
usually a loop-back test. For this test a loop-back plug is required.
This consists of a 15-way female plug with modem baseband
modulation in and out connected together. Disconnect the modem
from the radio and connect the loop-back plug onto the end of the
cable between modem and radio. Send a large amount of data and
check that the data received on the DTE is error-free. This test
requires the DTE to be full duplex capable and the baseband
modulation levels in and out of the modem to be equal.

Configure the radio as per described above.

Connect the modem and set up deviation levels as per the modem
manufacturer’s documentation.

Check that the transmit spectrum meets regulatory requirements in
the country of sale. Not necessary if tap in point T8 is used.

Use a second system to confirm end-to-end communication overthe-air. Initially it is recommended to do this with strong signal
conditions.

It is important for data applications to know the system delays through the
radio. Table 5.2 shows the system delays through the radio.
Table 5.2

System delays through the radio

System delay through the radio

Specification

EPTT assertion (zero debounce) to full carrier
power with valid modulation:
via tap T12 and T13
via tap T9
via tap T8

14.8±0.5ms
14.3±0.5ms
17.8±0.5ms

EPTT de-assertion (zero debounce) to valid
baseband modulation at AUD_TAP_OUT:
via tap R1 and R2
via R4

12.3±0.5ms
16.9±0.5ms

Modulation delay - antenna to AUD_TAP_OUT:
via tap R1 and R2
via tap R4

1.8ms typical
6.6ms typical

Modulation delay - AUD_TAP_IN to antenna:
via tap T12 and T13
via tap T8

1.8ms typical
9.6ms typical

Valid RF signal arriving at the antenna to carrier detect active:

3ms typical

Connecting Third-Party Products

113

5.1.2

Audio Headset
Headsets provide a private and hands-free means of using a two-way radio
and are typically used by dispatchers or users in high-noise environments.
PTT is normally provided with a foot switch.
The audio headset is connected to the microphone connector of the control
head. The microphone connector is described on page 35. It can also be
connected to the corresponding lines of the programming connector of the
blank control head.

Interface
Specification

Figure 5.2 shows the diagram of an audio headset interfaced with the
microphone connector of the TM8115 two-digit display control head.
Figure 5.2

Diagram of an audio headset connected to the radio

dyn. and
concealed
mic board
R11
R52

headset microphone

CH_MIC_AUD
AGND
RX_AUD

connector
C50

R53

control head
connector

foot
switch

SPK–
SPK+

AUX_GPI1

AGND

TM8115
control head

114

Connecting Third-Party Products

radio body

auxiliary
connector

Table 5.3 shows how to connect the audio headset to the radio:
Table 5.3

Audio headset interface specification

Lines of
audio headset

Microphone
connector

Signal

Description/parameter

Signal

Earphone Audio (+)

MIC_RX_AUD

Audio to earpiece.

Microphone Audio (+)

MIC_AUD

Microphone audio from headset.

Earphone Audio (–)

AGND

Analog ground for earpiece.

Microphone Audio (–)

AGND

Analog ground for microphone.

Table 5.4 shows how to connect the footswitch to the radio:
Table 5.4

Footswitch interface specification

Lines of footswitch

Auxiliary connector

Signal

Description/parameter
Signal

Switch output

AUX_GPI1

External PTT input

Switch ground

AGND

analog ground

Earphone Interface

If the headset is stereo, ensure both earphones are connected in parallel.
The earphones are connected to pin 1 of the microphone connector.
As headset earphones vary widely in their impedance and power ratings, two
different driver options are available in the radios with user interfaces. If you
are unsure of the headsets drive requirements, try the factory default
hardware configuration first.
For headsets with low drive or volume requirements, the factory default
hardware configuration can be used (R52 fitted, C50 and R53 not fitted).
The earphone DC resistance in this case should be greater than 100 Ω.
For headsets with high drive or volume requirements, one of the radios
internal speaker outputs should be used to drive the earphones. To connect
an internal speaker output to pin 1 on the microphone connector, remove
R52 and fit C50 and R53 on the control head board.
Figure 5.3 on page 116 shows the positions of C50, R52 and R53 on the
control head board.
Follow the instructions of the service manual for your radio on removing
and fitting the control head, the control head board, and standard and SMD
components.

Connecting Third-Party Products

115

Figure 5.3

Positions of C50, R52 and R53 on the control head board

bottom side

Choose values for C50 and R53 as follows:
1.

Measure the earphone DC resistance RE using a multimeter.

Choose C50 to be at least 10µF and R53 to be approximately equal
to RE.

Select an on-air channel with frequent voice activity and disconnect
the internal speaker.

Turn the volume to minimum and plug the headset into the
microphone socket.

Select and test the value of R53 until the desired headset volume is
achieved when the radio’s volume control is turned up to maximum.
Ensure the radio is powered down when making changes to the value
of R53.

Select the value of C50 to be 1/(1900·(R53+RE))

Round this result to the nearest preferred value.

The radio’s internal speaker should be left disconnected.
Microphone
Interface

If the headset microphone is an electret type, the factory default hardware
configuration (R11 fitted) can be used. DC bias for the headset microphone
is provided by the radio. Noise-cancelling electret microphones do not
require a different configuration.
If the headset microphone is a dynamic type, the TMAA02-06 Support Kit
for Concealed and Dynamic Microphones must be fitted in the control
head. For information on how to fit this kit refer to the service manual.

116

Connecting Third-Party Products

PTT Interface

Connect a footswitch or gear-lever PTT between AUX_GPI1 (pin 12) and
AGND (pin 15) on the radio’s auxiliary connector.

Radio Programming

Use the programming application to configure the radio.
1.

Direction

In the PTT /External PTT (1) form, set the /Advanced EPTT1
group to:
■

PTT Transmission Type: Voice

■

Audio Source: CH_MIC

In the Digital tab of the Programmable I/O form, carry out the
following settings:
Action

Active

Debounce

Signal state

AUX_GPI1

Input

External PTT1

Low

None

AUX_GPIO4

Output

Busy Status

High

None

Momentary

Pin
CH_GPIO1

Direction
Input

To eliminate mute and unmute ‘pop’ when the earphone is driven by
an internal speaker output, the audio PA needs to be forced on.
Configure the CH_GPIO1 line as follows.
Action
Force Audio PA On

Active
High

Debounce
10

Signal state
None

Ensure that nothing is connected to pin 8 of the microphone
connector.
Note

This setting will cause the receive standby current to increase by
approximately 50mA.

Connecting Third-Party Products

117

5.1.3

USB Adaptor
An increasing number of computers (in particular laptop computers) no
longer provide serial COM ports and instead provide USB connections.
To connect the radio to a USB port, a USB adaptor is required.
Note

If the PC has a COM port, the T2000-A19 cable can be connected directly to the PC without using a USB adaptor.

The PC is typically connected to the microphone connector of the control
head or to the programming connector of the blank control head. The PC
can also be connected to the auxiliary connector or, if an options extender
board is installed, to the external options connector.
The Rx and Tx signals of these connectors have TLL levels and are
described in “Description of the Radio Interfaces”. The TLL level must be
converted to RS-232 level using the Tait T2000-A19 cable. The T2000A19 cable does not support CTS/RTS hardware handshaking.
Figure 5.4 shows typical connections between the radio and the USB port
of the PC, and the cables and adaptors required (including Tait product
codes):
Figure 5.4

Diagram of radio connected to the USB port of a PC
TM8115
T950-001
USB adaptor

T2000-A19

TMAA20-04
microphone
connector

TTL
RJ45

RJ12

RS-232

RS-232
DB9

USB

TM8105
T950-001
USB adaptor

T2000-A19
TMAA20-02
TMAA20-04
programming
connector

TM8115
or
TM8105

TTL
DB9

RJ45

RJ12

RS-232

RS-232
DB9

TTL
DB15 RJ45

RJ12

RS-232

USB

T950-001
USB adaptor

T2000-A19
TMAA30-03
TMAA20-04

auxiliary
connector

USB

RS-232
DB9

USB

When installing the USB adaptor, follow the manufacturer’s instructions on
how to install the necessary device driver. The PC will typically see the USB
adaptor as a COM port.

118

Connecting Third-Party Products

5.2

Internal Products
Important

5.2.1

The maximum operating temperature specified for thirdparty internal modules can be lower than the temperature
generated inside the radio in the ambient temperature range
specified for the radio. This may require a reduction in the
radio’s operating temperature range or duty cycle. Suitable
provisions for heat dissipation must be implemented.

Encryption Module (Scrambler)
Important

Interface
Specification

The installation and configuration of encryption modules is
a complex task and should only be attempted by persons
with in-depth knowledge of the installation and commissioning of encryption systems.

The encryption module can be mounted inside the radio body where it
connects to the internal options connector via a standard 1.27mm pitch
ribbon cable. The internal options connector is described on page 27. The
audio lines are described in “Audio Tap In and Tap Out Lines” on page 91.
Figure 5.5 shows the diagram of an encryption module interfaced with the
internal options connector inside the radio body.
Figure 5.5

Diagram of encryption module connected to radio

RF connector

encryption
module

internal
options
connector

Connecting Third-Party Products

119

Configure the interface between the encryption module and the internal
options connector as described in Table 5.5.
Table 5.5

Encryption module interface specification

Encryption
module

Internal options
connector

Signal

Power

13V8_SW

Switched and unregulated power
from radio.

GND

AGND

analog ground.

PTT to options

IOP_GPIO1

Control head PTT signal from radio.
Reflect PTT Status
Action:
Low
Active State:
3V3 CMOS-compatible1
Module logic threshold required:

Clear/code mode

IOP_GPIO2

Mode select from radio. Toggled by
radio function key.
Action:
Active State:
Module logic threshold required:

F1…F4 Key Status
Low
3V3 CMOS-compatible1

Mode indicator to radio.
Action:
Active State:

Toggle F1…F4 Key LED
High

Tx audio from radio.
Audio tap input point:
Audio tap input unmuting:
Signal level into 600 Ω:
AUD_TAP_OUT output impedance:

Use T4-E
Use 'on PTT'
690mVp-p (60% RSD2)
600Ω typical

Tx audio to radio.
Audio tap input point:
Audio tap input unmuting:
Signal level into 600 Ω:
AUD_TAP_IN input impedance:

Use T4-E
Use 'except on PTT'
690mVp-p (60% RSD2)
100kΩ typical

Rx audio from radio.
Audio tap input point:
Audio tap input unmuting:
Signal level into 600 Ω:
AUD_TAP_OUT output impedance:

Use T4-E
Use 'on PTT'
690mVp-p (60% RSD2)
600Ω typical

Rx audio to radio.
Audio tap input point:
Audio tap input unmuting:
Signal level into 600 Ω:
AUD_TAP_IN input impedance:

Use T4-E
Use 'except on PTT'
690mVp-p (60% RSD2)
100kΩ typical

Secure mode

Radio Tx audio to
module

Module Tx
audio to radio

Radio Rx audio to
module

Module Rx
audio to radio

IOP_GPIO3

AUD_TAP_OUT

AUD_TAP_IN

AUD_TAP_OUT

AUD_TAP_IN

Description/parameter

Specification

1. If the module input is 5V CMOS then a 3.3kΩ pullup to 5V on the module will be required for compatibility.
For more information refer to “Digital Output Lines” on page 70.
2. RSD = Rated System Deviation

120

Connecting Third-Party Products

Figure 5.6 shows the audio interfacing between the radio and the
encryption module specified in Table 5.5.
Figure 5.6

Encryption module - audio interfacing

audible
indicators

receive audio path
receiver
demodulator
output

3kHz
LPF

deviation
normaliser

300Hz
HPF

R10

deemphasis
R7

future
processing
option

audio to
volume
control
and
speaker

encryption module
AUD_TAP_OUT

Tx in

pre300Hz
emphasis HPF

Rx in

DSP
Rx-Tx
audio
switch

decrypt/
encrypt

AUD_TAP_IN

deemphasis

4.7k

560

synch
pulse
detect

synch
pulse
inject

2.5
kHz
LPF

DSP
Rx-Tx
audio
switch

transmit audio path
audio to T13
transmitter
modulator

T12

T3
T4

dev.
scaler

3kHz
LPF

limiter

pre300 Hz
emphasis HPF

future
processing
option

ALC
mic
audio

Key:
tap point (tap in or tap out)
DSPdigital signal processor
LPFlow-pass filter

tap types:
type A
Bypass In

type B
Combine

type C
type D
Bypass Out Split

type E
Splice

HPFhigh-pass filter
ALCauto level controlled

The audio interfaces in Figure 5.6 are recommended and best suit
Transcrypt SC20-4xx series encryption modules. This configuration
maximises system flexibility by not excluding other hardware options and
system configurations from being used with encryption. For example, the
encryption module could be used in a radio that is cross-band linked with a
second radio.

Connecting Third-Party Products

121

Encryption Module
Hardware
Configuration

Configure the encryption module hardware as shown in Figure 5.6.

Adjust encryption module for unity through-gain. At least 11dB
headroom above the 1kHz 60% rated system deviation level will be
required throughout the audio processing chain on the module to
avoid clipping with speech signals.

Input pre-emphasis is required. A typical pre-emphasis circuit is
shown in Figure 5.7. If this not available on the module it will need
to be added as a separate circuit at the module input. Alternatively the
input buffer on the module can be modified if its topology matches
that of Figure 5.7.

Figure 5.7

Encryption module - typical pre-emphasis circuit

R2
C1

R1
–

AUD_TAP_OUT
half rail

to next encryption module
audio processing block

Use the following procedure to choose the component values in
Figure 5.7:
a. Choose C1. 1nF is a typical value.
b. Determine R1: R1=1/(35300*C1)
c. Determine R2: R2=5.9*R1 for unity gain. Scale R2 proportionally to change gain.
d. Ensure that C2 is zero.
e. Use the nearest preferred component values.
4.

Ensure that de-emphasis is applied on both transmit and receive.
If this cannot be done via software then the de-emphasis control line
will need to be overridden by a hardware modification.

Encryption Module
Software
Configuration

To make configuration changes via over-the-air rekeying (OTAR), the
module needs to be installed in the radio and be operational.

Key Management

For key management refer to the relevant sections of the encryption module
manufacturer’s documentation.

122

Connecting Third-Party Products

Use the programming application to configure the radio.

Radio Programming

In the Key Settings form, set one function key to
Action Digital Output Line.

In the PTT / PTT form, set the Advanced PTT group to:

PTT Transmission Type: Voice

■

PTT State Is Reflected: checked

■

PTT Priority: Highest

■

Audio Source: CH_MIC

In the Digital tab of the Programmable I/O form, carry out the
following settings:

Direction

IOP_GPIO1

Output

IOP_GPIO2
IOP_GPIO3

Action

Active

Debounce

Signal state

Reflect PTT Status

Low

None

Output

F1 Key Status

High

None

Momentary

Input

Toggle F1 Key LED

High

None

Rx /
PTT Type

■

Tap In

Momentary

In the Audio tab of the Programmable I/O form, carry out the
following settings:

Tap In Type

Tap In Unmute

Tap
Out

Tap Out Type

Tap Out Unmute

E - Splice

Busy Detect

E - Splice

Busy Detect

EPTT1

E - Splice

On PTT

E - Splice

On PTT

Operation

With the radios with user interfaces, one function key can be programmed
to toggle between Clear and Secure mode. The Secure LED lights up when
the radio is in Secure mode. The radio has no facility to change the
decryption/encryption code via the user interface.
When the radio is set to Clear mode (unencrypted), the encryption module
does not affect the radio operation.
Unencrypted messages received while the radio is in Secure mode will be
received as normal, i.e. the radio does not apply any decryption.
To initiate a secure call:
1.

Press the Clear/Secure function key (if not already in Secure mode).
The Secure LED lights up.

Press PTT to set up a call (assuming the other party has valid
decryption). You must wait at least 0.5s before speaking to allow the
receiving encryption module to synchronise.

Carry out the call in standard manner.

Connecting Third-Party Products

123

The radio will stay in Secure mode until the Clear/Secure function key is
pressed again.
The coding or setup of the encryption module can only be changed via the
over-the-air rekeying protocol (OTAR) provided by the module
manufacturer. For further information refer to the manufacturer’s
documentation.
Radio performance degradation is to be expected when encryption is active.
The main effects are reduced radio range and audio quality.
Testing

With encryption off:
1.

Check that the radio powers up normally, with the normal display
messages and confirmation tones.

Check that receive and transmit audio are functioning, using a service
instrument or another radio on the same channel.

With encryption on:

124

Check that the radio receives and transmits, using another TM8000
radio with the same encryption module, programmed with the same
codes, on the same channel.

Listen for the synchronisation pulses that occur approximately once a
second, added by encryption, to confirm encryption is active.

Connecting Third-Party Products

5.2.2

ANI Module
Automatic Number Identification (ANI) modules can be installed in
portable or mobile radios. When the ANI module is installed, each radio
transmission can have a unique number attached to it to assist dispatchers in
identifying the source of transmission.
Note

Interface
Specification

The radios also offer built-in ANI capabilities. For more information refer to the online help of the programming application.

The ANI module is mounted inside the radio body where it connects to the
internal options connector via a standard 1.27 mm pitch ribbon cable.
An optional emergency switch can be connected to AUX_GPIO4 and
AGND of the auxiliary connector.
The internal options connector is described on page 27.
Figure 5.8 shows the diagram of an ANI module interfaced with the
internal options connector inside the radio body.

Figure 5.8

Diagram of ANI module connected to radio

ANI
module

internal
options
connector

AUX_GPIO4

auxiliary
connector

emergency
switch
(optional)

AGND

Connecting Third-Party Products

125

Configure the internal options interface as described in Table 5.6:
Table 5.6

ANI module interface specification

ANI module
Signal

Internal options
connector

Description/parameter

Specification

Signal

Power

13V8_SW

Switched and unregulated power
from radio.

GND

AGND

analog ground.

IOP_GPIO1

Control head PTT signal from radio.
Action:
Reflect PTT Status
Active State:
Low
Module logic threshold required:
3V3 CMOS-compatible2

Emergency input

IOP_GPIO2

Emergency signal from radio. Signal
mirrored from auxiliary connector.
Action:
Mirrored from AUX_GPIO43
Low
Active State:
3V3 CMOS-compatible2
Module logic threshold required:

Mic mute

IOP_GPIO3

Mic mute signal to radio. Used as
PTT input in order to switch audio
source from radio mic to ANI.
Action:
Active State:

External PTT2
Low

Tone output to radio.
Audio tap input point:
Audio tap input unmuting:
Signal level required:
AUD_TAP_IN input impedance:

Use T5-A
Use 'on PTT'
690mVp-p (60% RSD4)
100kΩ typical

PTT

in/out1

Module tone out

AUD_TAP_IN

1. If the ANI module has separate PTT in and out signals, tie these together on the module. This will disable the modules on-board Tx timer. Ensure the radios Tx timer duration is set as you require.
2. If the module input is 5V CMOS, a 3.3kΩ pullup to 5V must be fitted on the module.
3. The radio’s emergency mode should be disabled if the modules emergency features are used.
4. RSD = Rated System Deviation

126

Connecting Third-Party Products

Use the programming application to configure the radio.

Radio Programming

Direction

In the Digital tab of the Programmable I/O form, carry out the
following settings:
Action

Active

Debounce

Signal state

Mirrored to

AUX_GPIO4

Input

No action

High

100

None

IOP_GPIO2

IOP_GPIO1

Output

Reflect PTT Status

None

Momentary

None

IOP_GPIO2

Output

No action

None

Momentary

None

IOP_GPIO3

Input

External PTT2

None

Rx /
PTT Type
EPTT2

Tap In
T5

Tap In Type
A - Bypass In

ANI Module
Programming

In the Audio tab of the Programmable I/O form, carry out the
following settings:
Tap In Unmute
On PTT

Tap
Out
None

Tap Out Type

Tap Out Unmute

C - Bypass Out On PTT

In the PTT / PTT form, set the Advanced PTT group to:
■

PTT Transmission Type: Voice

■

PTT State Is Reflected: checked

■

PTT Priority: Medium

■

Audio Source: CH_MIC

In the PTT / External PTT1 form, set the Advanced EPTT1 group
to:
■

PTT Transmission Type: None

■

PTT State Is Reflected: cleared

In the PTT / External PTT2 form, set the Advanced EPTT2 group
to:
■

PTT Transmission Type: Voice

■

PTT State Is Reflected: cleared

■

PTT Priority: Highest

■

Audio Source: Audio Tap In

Refer to the manufacturer’s documentation.

Connecting Third-Party Products

127

128

Connecting Third-Party Products

Connecting an External Alert Device
The TM8100 and TM8200 radios allows for output to external alert devices
using the digital GPIO lines of the auxiliary connector, the internal options
connector and, with the blank control head, the programming connector.
The AUX_GPIO4 line of the auxiliary connector can be fitted with a power
MOSFET in order to directly connect external alert devices (e.g. flashing
light, buzzer, horn relay) to the radio. With the other GPIO lines and if no
power MOSFET is fitted to the AUX_GPIO4 line, the signal characteristics
specified in “Description of the Radio Interfaces” apply.
This chapter describes the connection of an external alert device to the
AUX_GPIO4 line of the auxiliary connector and the programming of the
radio for an external alert signal.
Important

Modifications to radio-frequency transmitting equipment
can void the user's authority to operate the equipment.
By distributing the TM8000 3DK Hardware Developer’s
Kit, Tait Electronics Limited. does not accept liability for
any non-compliance or infringement of intellectual property rights resulting from the application or use of this kit
or information. Any person modifying Tait radio-frequency transmitting equipment is responsible for ensuring
that the modified equipment meets all legal and regulatory
requirements in the country of use or supply.

To connect an external alert device to the AUX_GPIO4 line of the auxiliary
connector, the following steps must be carried out:
1.

Fit power MOSFET Q707 and remove resistor R768.

Program the radio.

Connect the external alert device.

Connecting an External Alert Device

129

6.1
Fitting Power MOSFET Q707 and
Removing Resistor R768
Before connecting an external alert device to the AUX_GPIO4 line, a 12A,
60V, logic level power MOSFET (ON Semiconductor1 product
NTD3055L104, www.onsemi.com [Tait IPN 000-03055-00]) must be
fitted to position Q707 and resistor R768 must be removed from the main
board assembly.
Figure 6.1 shows the circuit diagram of the AUX_GPIO4 line in factory
configuration. For a complete circuit diagram of the main board assembly
refer to the service manual for your radio.
Figure 6.1

Circuit diagram of the AUX_GPIO4 line (factory configuration)
+3V3

+3V3_CL
3 D711
BAV70W
1

ITF_AUX_GPI4

+5V +13V8_SW

R769
33K

R757

4
6

3
Q703
BC847BPN

R748
4K7

2
R753
4K7

*not fitted

R768

100K

DIG_AUX_GPI4

R782
0805

47K

+3V3
R745

R778
0805

Q703
1 BC847BPN
R761
56

NTD3055L104
Q707

+13V8_BATT
2 D713
BAV99W
3
3 D713
BAV99W

AUX_GPIO4
C725
470P

1B4

Figure 6.2 shows the positions of Q707 and R768. For a complete layout of
the main board assembly refer to the service manual for your radio.
Follow the instructions of the service manual for your radio on removing
and fitting the radio lid, the main board assembly, and standard and SMD
components.
Figure 6.2

Positions of Q707 and R768 on the main board assembly

1. ON Semiconductor is a trademark of Semiconductor Components Industries, L.L.C.

130

Connecting an External Alert Device

6.2

Radio Programming

Programmable I/O
Form

In the Digital tab of the Programmable I/O form, select the AUX_GPIO4
pin and set Direction to Output, Action to External Alert 1 or 2, Active to
Low and Signal State to Momentary.
For further information on the External Alert action refer to “External Alert
1 and 2” on page 80.

Networks / Alerts
Form

In the General and External Alerts tab of the Networks / Alerts form,
configure the settings of the external alerts.
For further information on how to configure the Alerts form refer to the
online help of the programming software.

6.3

Connecting the External Alert Device
Important

While MOSFET Q707 is rated at 12A (with heat sink), the
maximum allowable current of the connector and radio’s
earthing system is 2A. Therefore, a horn must not be connected directly to the radio. A horn relay must be used.

Connect the external alert device to pin 10 (AUX_GPIO4) and pin 8
(13V8_SW) of the auxiliary connector (or a different positive battery
connection).

Connecting an External Alert Device

131

132

Connecting an External Alert Device

Computer-Controlled Radio

7.1

Introduction

7.1.1

Overview
This chapter provides details of the Computer-Controlled Radio (CCR)
protocol, version 2.00. It describes the radio to Data Terminal Equipment
(DTE) protocol. This is an advanced radio control feature.
Note

CCR applies to TM8100 radio terminals only.

The CCR protocol is intended to provide a means of controlling a radio
unit from some form of DTE via a serial interface (PC, AVL application,
Telemetry Application, MDT).
In CCR mode, the radio no longer uses a non-volatile database. A number
of radio parameters are uploaded and changed during run-time from an
external application. In this way, the external application provides the nonvolatile data storage.
All serial ports on the radio support CCR (Microphone, Auxiliary and
Internal Options).
The TM8100 CCR mode is a sub-mode of CCDI. Entry into CCR is via
a CCDI command (“f0200D8”). Once, in CCR mode the radio will accept
serial CCR commands and will no longer process CCDI commands.
The TM8100 series of radios are able to support USER, CCDI Transparent
and CCR modes of operation.

7.1.2

Benefits
Most of the radio functionality can be controlled by the external device
operating over a serial communications link. This allows system integrators
to develop their own intelligent control device. They can develop complex
solutions with a low cost RF platform.
In essence, a radio which has access to all the channels in its operating range
could be made. The limit is no longer in the mobile but in the external
intelligence driving it. A wider range of methods can be employed to alter
or modify the way the radio is controlled by the user; a step forward in
control evolution.

Computer-Controlled Radio

133

7.1.3

Configurable Parameters
Channel information:
■

Tx/Rx frequencies

■

Tx & Rx CTCSS/DCS frequencies

■

Tx power level

■

Channel bandwidth

The unit can accept or send Selcall in:
■

All the international tone formats

■

Between 2 and 8 tones per sequence.

■

Tone durations from 20 - 100ms

■

ANI leading/trailing sequence

Other features:

7.1.4

7.2

■

Audio volume level

■

Enable/disable monitor

Potential Applications
■

Complex conventional radio units (multi-system)

■

MDT controlled radio

■

Remote off-air monitoring

■

System integration

■

Self healing RF networks

■

Rapid deployment - inter operability

■

Hybrid solutions

Programmable Parameters
CCR depends on the same programmable parameters as those used to
configure CCDI command mode.

7.2.1

Requirements
The following needs to be enabled as a minimum:

134

■

Enable CCDI

■

Enable a serial port for communications (Auxiliary, Mic or Internal
Options connector) as follows:

Computer-Controlled Radio

Parameter

Value

Baud rate

1200, 2400, 4800, 9600, 14400, or 19200

Number of data bits

Parity

None

Number of stop bits

Note

The recommended configuration parameters are in Bold.

Note

The serial port on the TM8100 is capable of driving only a limited
cable length. See “Line Lengths” on page 12.

Radio operation while in CCR mode also requires, as a minimum, the
following to be defined:
■

Enable at least one channel

■

Enable at least one PTT & microphone for voice

For selcall commands it is also necessary to enable at least one network using
selcall signalling, as follows:
■

Enable network to be selcall

The radio will, upon entry to CCR, inherit programmable parameters from
the channel that was active when CCR was entered. Modifications while in
CCR mode to channel/network characteristics will be compared to this
baseline. All CCR changes are temporary, nothing is saved to the database,
therefore they are lost on power cycling.

7.3

Command Protocol
The DTE is connected to the RU via a serial link. Command and response
messages are generated between the DTE and the RU.

7.4

Command Description
This section details the standard messages.

7.4.1

Message Format
All CCR mode message packets take the following general form:
[IDENT][SIZE][PARAMETERS][CHECKSUM]

Computer-Controlled Radio

135

Where:
Parameter

Value

[IDENT]

is the message identifier. Identifiers are single ASCII characters
which categorise the message type

[SIZE]

is the number of characters which make up the [PARAMETERS]
field. [SIZE] is an 8-bit number expressed in ASCII-hex notation
(two characters)

[PARAMETERS]

is an optional field, depending upon the command. Parameter
values are generally character strings unless explicitly stated
otherwise. Parameter type is dependent upon the command there is no explicit type definition.

[CHECKSUM]

s an 8-bit checksum of the [IDENT], [SIZE] and [PARAMETERS]
fields. It is expressed in ASCII-hex notation (two characters)

is the packet terminator. It is the ASCII “carriage return”
character (0Dh).

General characteristics of the message format worth noting are as follows:

7.4.2

■

All characters in a message are printable ASCII

■

Where numeric values are represented in ASCII-hex notation (two
characters per byte), digits A...F are upper case

■

The minimum length of a command packet is 5 characters; i.e. when
[SIZE] = 00. For example, c003D is the CANCEL command which is
5 characters.

■

The maximum length of the [PARAMETERS] field is 32 characters, so
that the maximum length of the command packet is therefore
37 ([SIZE]=“20”) characters

Calculating [CHECKSUM]
[CHECKSUM] is calculated by applying the following algorithm:

Checksum Example

Take the modulo-2 sum of all message bytes preceding
[CHECKSUM].

Retain bits 0...7, discarding any higher order bits resulting from the
summation.

Form the two's complement of the remainder.

Convert the binary number into two ASCII-hex digits, MSD first.

s0D050800TESTHi!DA
1.

Take the modulo-2 sum of all message bytes preceding
[CHECKSUM].
■

136

s = 73h, 0 = 30h, D = 44h etc. therefore the modulo-2 sum is:

Computer-Controlled Radio

73 + 30 + 44 + 30 + 35 + 30 + 38 + 30 + 30 + 54 + 45 + 53 + 54
+ 48 + 69 + 21 = 426h
2.

Retain bits 0 to 7, discarding any higher order bits resulting from the
summation.
26h

Form the two’s complement of the remainder.
26h = 0010 0110
two’s complement = 1101 1010

Convert the binary number into two ASCII hex digits, MSD first.
1101 1010 = DA

7.5

CCR Mode Commands

7.5.1

Entering CCR Mode
CCR mode is entered from CCDI with the function zero command,
“f0200D8”. This command is described in the CCDI specifications.
Entry to CCR mode will be denied if the radio is busy scanning,
transmitting or processing emergency mode activities. CCR mode is not,
however, blocked when the radio is stunned; CCR can run in this state.

7.5.2

CCR/CCDI Mode Independence
CCDI and CCR are independent from each other in that commands and
responses for either command interpreter can only be processed in its own
mode. There are, for instance, no CCDI progress messages when the radio
is in CCR mode.

7.5.3

CCR Mode Activated
The radio sends the string “M01R00” to the DTE when CCR mode is
activated.

7.5.4

CCR Mode Busy
It is possible to program an output line for busy detect status in CCR mode.

Computer-Controlled Radio

137

7.5.5

Blocked Functions
CCR mode denies the following functions (that are available in user mode)
and indicates them as invalid if they are attempted from a front panel or
programmable input:
■

Channel selection

■

Scanning

■

Emergency

■

SDM (No GPS)

■

User mode selcalling:
■

No call setups with the front panel controls, programmable I/O
or PTT

■

No selcall alerting for identities defined in the database

CCR is intended for headless radio units. Third parties can, upon
integration, add their own implementations for things like scanning & selcall
alerts.
Note

7.5.6

PTT initiated functionality will only be suppressed, not indicated,
notably, PTT call setup.

CCR Persistence
When a radio is reset nothing is saved from the current CCR session to the
next power up. Third party devices can check that the radio is alive with the
pulse command and “reprogram” it when a power outage has been detected.

7.5.7

CCR Response Time
The receive frequency in CCR mode can be changed at least every 20ms.

7.6

CCR Positive Acknowledgements
The radio validates the received strings since the last command on the serial
port versus the CCR protocol when it sees an instance of the terminating
character . It returns either a positive or negative acknowledgement.
The positive acknowledgement has the following format.

Response

+ssxCC
Where:

138

Computer-Controlled Radio

Parameter

Effect

7.7

Value

the ASCII ‘+’ character indicates that the command was accepted

ASCII hex number ss is the size of the ack (always “01”)

echoes back the command identity, the first letter (R, T, A, B, S, M…)

ASCII hex number CC is the checksum

An ACK response is sent back when a command has been accepted, the
radio does not wait until the command has been executed. The ACK may
be delayed, in some cases, but usually it is sent back immediately.

CCR Negative Acknowledgements
The radio validates the received strings since the last command on the serial
port versus the CCR protocol when it sees an instance of the terminating
character . It returns either a positive or negative acknowledgement.
The negative acknowledgements are as follows.

7.7.1

Invalid CCR Command
If a string does not conform to the protocol, or there is something else
inhibiting its execution, it is rejected and a negative acknowledgement is
sent to the user. The negative acknowledgement has the following format.

Response

-ssrrxCC
Where:
Parameter
rr

Value
the ASCII ‘–’ character indicates that the command was rejected
indicates the reason for rejecting the command as follows:
■

‘02’ Checksum error

■

‘01’ Invalid command

■

‘03’ Parameter error in command

■

‘05’ Radio is busy

■

‘06’ Command is not accepted

echoes back the command identity, but only if the checksum in the
command was correct

ASCII hex number CC is the checksum

Note

A command is only ever rejected with one error code.

Computer-Controlled Radio

139

Effect

7.7.2

The implementation exits the validation as soon as an error has been struck
- it will not check the parameters if the command does not pass the
checksum test.

Validation Checksum Error
If the input string does not have the correct checksum, a checksum error is
immediately reported and no further checks are done.

7.7.3

Invalid Validation Command
If the input string passes the checksum test but the identity contained is not
a recognised CCR command, an invalid command is reported.

7.7.4

Validation Parameter Error
If the input string passes the general message format but not the command
specific tests, a parameter error is sent. For details on validation rules see the
specific commands.

7.7.5

■

data length check

■

range check on message data

■

correct sequence of commands

Radio Busy Message
If the input string passes both the general and command specific validation
criteria, it is processed only if the following conditions are true:
■

Radio is not in transmitting state

■

Radio is not busy processing the last sent command

The radio rejects the commands and returns the busy error code in these
instances.

7.7.6

Command Not Accepted Message
Some commands trigger sequence errors if they are sent when the radio
cannot process the command, for example:
■

Radio is attempting to use a selcall command when there is no selcall
configuration defined.

This error is, for instance, sent if a selcall command is received, but the CCR
channel is not activated with a network using selcall signalling.

140

Computer-Controlled Radio

7.8

CCR Commands

7.8.1

Summary and Examples
The messages in the following table are sent from the DTE to the RU.
Message

Cmd

RssxxxxxxxxxCC

Function
R

Go to receive frequency

TssxxxxxxxxxCC

Load transmit frequency

HssxCC

Set bandwidth

JssxxxCC

Set volume level

AssxxxxCC

Receive ctcss value

BssxxxxCC

Transmit ctcss value

CssxxxxCC

Receive dcs code value

DssxxxxCC

Transmit dcs code value

SssxxxxxCC

Encode Selcall sequence

IsstplCC

Set Selcall Parameters

NsspxxxxxCC

Set ANI

PssxCC

Set Power

QssxCC

Query Commands

EssCC

Exit CCR Mode

In all cases, if the command is received without error by the RU and all the
parameters are valid, the command will be executed and the prompt will be
returned to the DTE. If an error arises, the DTE will be notified with an
appropriate response.
Examples

f0200D8
E005B

Enter ccr from ccdi
Exit - same effect as “^”

R0945320000087 Set Rx frequency to 453.2MHz
T0945320000085 Set Tx frequency to 453.2MHz
Q01PFE
Pulse command, returns “P” when minimum config
exists
P0111E
P0141B
H01324
H01126

Set power to Very Low
Set power to High
Set bandwidth to Wide
Set bandwidth to Narrow

A0406708E
A0400009B
B0406708D
B0400009A
C03023C5

Set Rx ctcss to 67Hz
Set Rx ctcss to 0Hz
Set Tx ctcss to 67Hz
Set Tx ctcss to 0Hz
Set Rx DCS to 23

Computer-Controlled Radio

141

7.8.2

C03000CA
D03023C4
D03000C9

Set Rx DCS to 0
Set Tx DCS to 23
Set Tx DCS to 0

S051234549
I03015BE
N04112387

Dial 12345
Select toneset 0, ccir, 20ms tones and 5 tones notify
Set ani to leading and tones 123

M01D0E
M01E0D

Monitor “on”
Monitor “off ”

J03000C3
J03104BE

Volume level 0 (range is 0-255)
Volume level 104 (range is 0-255)

Go to Receive Frequency

Description

On receipt of this command, the radio checks the format and does a range
check on the frequency. If it is valid, the radio sends an ACK response and
then initialises the synthesizer with the new frequency. One should allow
20ms for the synthesizer to settle at the new frequency. If the command is
invalid, a NAK response will be sent and the receiver will remain at the last
selected frequency. If the radio is transmitting then a NAK response will also
be sent.

Command

RssxxxxxxxxxCC
Where:
Parameter
R

ASCII letter R denotes the go to Receive frequency

ASCII hex number ss is the number of x characters “08” or “09”

xxxxxxxxx

ASCII number xxxxxxxxx is the receive frequency, as follows:

Effect

142

Value

■

Minimum is a number representing the bottom of the radio model
frequency band

■

Maximum is a number representing the top of the radio model
frequency band

ASCII hex number CC is the checksum

This command has immediate effect with the receiver retuning to this
channel. If the synthesizer is out of lock then a NAK response will be sent.

Computer-Controlled Radio

7.8.3

Load Transmit Frequency

Description

On receipt of this command, the radio checks the format and does a range
check on the frequency. If it is valid, the radio sends an ACK response. If the
command is invalid, a NAK response will be sent and the transmit frequency
will not change. If the radio is transmitting then a NAK response will also
be sent.

Command

TssxxxxxxxxxCC
Where:
Parameter
T

ASCII letter T denotes the Load Transmit Frequency command

ASCII hex number ss is the number of x characters “08” or “09”

xxxxxxxxx

ASCII number xxxxxxxxx is the transmit frequency, as follows:

Effect

7.8.4

Value

■

Minimum is a number representing the bottom of the radio model
frequency band

■

Maximum is a number representing the top of the radio model
frequency band

ASCII hex number CC is the checksum

This command loads the transmit frequency into a memory location for use
when the PTT or Selcall encoder is next active. The radio will not transmit
if the synthesizer is out of lock.

Set Volume Level

Description

This command sets the volume level for received audio. If the index number
is out of range the radio does not act on the command and sends a NAK
(range error) back.

Command

JssxxxCC
Where:
Parameter

Value

ASCII letter J denotes the Set Volume Level command

ASCII hex number ss is the number of x characters (always “03”)

xxx

ASCII number xxx is a volume level value in the range of 0 to 255
(255 is the maximum)

ASCII hex number CC is the checksum

Computer-Controlled Radio

143

This command has immediate effect.

Effect

If there is a volume knob on the radio there is no guarantee that the value
set with this command will be the volume. The radio will use the level last
set with any control.

7.8.5

Receive CTCSS Value

Description

This command disables (if xxxx=0), or enables (if xxxx>0), Rx CTCSS.
If enabled, the audio mute is opened only when a given subaudible CTCSS
tone is being received (otherwise the audio mute is closed). If disabled,
muting on CTCSS is disabled. If the frequency is out of range, the radio
does not act on the command and sends a NAK (range error) back.

Command

AssxxxCC
Where:
Parameter

Value

ASCII letter A denotes the Receive CTCSS Value load command

ASCII hex number ss is the number of x characters (always “04”)

xxxx

ASCII number xxxx is a receive subaudible frequency in 0.1Hz. The
valid range is 67Hz to 254.1 Hz.

ASCII hex number CC is the checksum

This command has immediate effect and closes the mute to signals without
a valid CTCSS tone if enabled, or opens the mute on disabling CTCSS
muting.

Effect

7.8.6

Transmit CTCSS Value

Description

This command disables (if xxxx=0) or enables (if xxxx>0), Tx CTCSS. If
enabled, a CTCSS tone is transmitted whenever the radio is transmitting
audio. If the reference number is out of range, the radio does not act on the
command and sends a NAK (range error) back to the radio. If the radio is
already transmitting then a NAK response will also be sent.

Command

BssxxxCC
Where:

144

Computer-Controlled Radio

Parameter

Effect

7.8.7

Value

ASCII letter B denotes the transmit CTCSS value to be sent on
transmit

ASCII hex number ss is the number of x characters (always “04”)

xxxx

ASCII number xxxx is a transmit CTCSS frequency in 0.1Hz. The valid
range is 67Hz to 254.1 Hz.

ASCII hex number CC is the checksum

On receipt of the request the radio stores the CTCSS tone to generate. The
radio will then generate the tone at the next PTT or Selcall encode activity.

Receive DCS Value

Description

This command disables the DCS filter if the code is “000”. If the code is not
recognized as an octal, the radio does not act on the command and sends a
NAK (range error) back.

Command

CssxxxCC
Where:
Parameter

Effect

7.8.8

Value

ASCII letter C denotes the Receive DCS Value load command

ASCII hex number ss is the number of x characters (always “03”)

xxx

ASCII number xxx represents a DCS code in octal

ASCII hex number CC is the checksum

This command has immediate effect and closes the mute to signals without
a valid DCS tone.

Transmit DCS Value

Description

This command disables the DCS encoding if the code is “000”. If the code
is not recognized as an octal, the radio does not act on the command and
sends a NAK (range error) back.

Command

DssxxxCC
Where:

Computer-Controlled Radio

145

Parameter

Value

ASCII letter D denotes the transmit DCS value to be sent on transmit

ASCII hex number ss is the number of x characters (always “03”)

xxx

ASCII number xxx represents a DCS code in octal

ASCII hex number CC is the checksum

This command loads the value into memory ready for the next PTT or
Selcall encode activity.

Effect

7.8.9

Encode Selcall Sequence

Description

This command turns the transmitter on and sends the Selcall string
following a short delay (network 1 lead-in delay). If the number of tones is
incorrect the command is rejected (NAK-format error).

Command

Sssxx..xxCC
Where:
Parameter

Value

ASCII letter S denotes the Transmit Selcall tone sequence

ASCII hex number ss is the number of x characters

xx..xx

ASCII number xx..xx is the tone sequence. Minimum is 2 tones and
maximum is 33.

ASCII hex number CC is the checksum

The Set Selcall Parameter command (see below) allows the user to change
the Selcall parameter defaults.
This command has immediate effect, provided that the receiver and
transmitter frequency values have been initialised and the radio is not
transmitting at the time (PTT active causes busy error)

Effect

7.8.10
Description

146

Set Selcall Parameters
This command allows the user to modify the Selcall default parameters (tone
set to use, tone period, number of tones in Tx sequence and number of
tones in Rx sequence). If any of the command parameters are out of range,
a NAK (range error) will be sent back to the control head.

Computer-Controlled Radio

Command

IsstplCC
Where:
Parameter
I

the ASCII letter I denotes the Set Selcall Parameter command

ASCII hex number ss is the number of parameters (always “03”)

specifies the Tone Set to use. This can be one of the following:

Effect

Value

■

’0’

CCIR

■

’1’

EIA

■

’2’

EEA

■

’3’

ZVEI-I

■

’4’

ZVEI-II

■

’5’

ZVEI-III

■

’6’

PZVEI

■

’7’

NATEL

■

’8’

DZVEI

specifies the Tone Period to use. This can be one of the following:
■

’1’

20ms

■

’2’

33ms

■

’3’

40ms

■

’4’

50ms

■

’5’

60ms

■

’6’

70ms

■

’7’

100ms

sets the decode buffer time and message filter as defined in “Notify
Buffer Size” on page 153 and “Selcall Decode Sequence” on page
153.

ASCII hex number CC is the checksum

The Selcall modem is immediately re-initialised with the new decode
parameter map. These new parameters are applied for the next Selcall
decode/encode sequence.
CCR default parameters are those loaded from the network associated to the
selected channel when the radio enters CCR mode. This includes selcall
parameters like ‘lead in delay’, which it is not possible to alter in CCR
mode.

Computer-Controlled Radio

147

7.8.11

Set ANI
This command disables or enables ANI. It configures what ANI sequence is
to be sent and when the ANI sequence is to be sent. If p is not ‘0’, the tone
sequence gets stored.

Description

If the number of tones (xx...xx) does not match the currently configured
length, then the command is rejected (NAK- format error). It is also
rejected if p is out of range (range error).
Nsspxx..xxCC

Command

Where:
Parameter

Value

ASCII letter N denotes the Automatic Number Identification
command

ASCII hex number ss is the number of parameters

denotes the ANI position with regard to PTT presses. Valid values are:
■

’0’

disables ANI (in this case the tone sequence xx..xx is not
required)

■

’1’

leading ANI (ANI is sent soon after PTT is pressed)

■

’2’

trailing ANI (ANI is sent when PTT is released)

■

’3’

combination of 1 and 2

xx..xx

is the 5 to 8 tone sequence. It is optional if p is set to 0.

ASCII hex number CC is the checksum

If enabled, the ANI tones get stored and any subsequent use of the PTT
button activates ANI.

Effect

7.8.12

Monitor

Description

This command is the same as the monitor function available on the function
keys in normal user mode. When it is active, it overrides any active
subaudible signalling filters. The squelch mute is not overridden.

Command

MssxCC

148

Computer-Controlled Radio

Where:
Parameter
M

ASCII letter M indicates it is a monitor command

ASCII hex number ss is the number of parameters (always “01”)

is the mute state wanted, as follows:

Effect

Value

■

’D’

for disable mute (monitor)

■

’E’

for enable mute

ASCII hex number CC is the checksum

Immediate.
If there is a front panel key or programmable input with monitor configured,
there is no guarantee that the value set with this command will represent the
monitor state. The radio will use the state last set with any control.

7.8.13

Transmitter Output Power

Description

The transmitter output power is set to the value selected. If the index is
incorrect the command is rejected (NAK-format error).

Command

PssxCC
Where:
Parameter
P

ASCII letter P indicates it is a power command

ASCII hex number ss is the number of parameters (always “01”)

is an index to transmit power level, as follows:

Effect

Value

■

‘1’

very low power

■

‘2’

low power

■

‘3’

medium power

■

‘4’

high power

ASCII hex number CC is the checksum

The modified power level takes effect on the next Tx activity; either PTT
or Selcall.
Note

If there is a front panel key or programmable input with low power
configured, there is no guarantee that the value set with this command will represent the effective output power. The radio will use
the state last set with any control.

Computer-Controlled Radio

149

7.8.14

Set Bandwidth

Description

This command sets the operating transmit/receive bandwidth. If the index
number is out of range, the radio does not act on the command and sends a
NAK (range error) back.

Command

HssxCC
Where:
Parameter

Value

ASCII letter denotes the Set Bandwith command

ASCII hex number ss is the number of x characters (always “01”)

is the Bandwith Index, as follows:
■

‘1’

narrowband

■

‘2’

mediumband

■

‘3’

wideband

ASCII hex number CC is the checksum

This command has immediate effect.

Effect

7.8.15
Description

Query Radio Pulse
The purpose of this command is to give the user a way to “ping” the radio.
The radio pulse command allows you to check that the radio is still
responding. The control device may use the radio pulse command every ten
seconds in the absence of other activity.

Command

Q01PFE
Where:
Parameter

150

Value

ASCII letter Q indicates it is a query command as opposed to a set-up
command

ASCII hex number 01 indicates it has 1 parameter

ASCII letter P indicates it is the radio pulse command

ASCII letters FE are the checksum

Computer-Controlled Radio

Response

Effect

7.8.16

The radio will send back one of two responses:
■

QssPCC - if the radio has got its minimum configuration, which
typically consists of having received a ‘set receive frequency’ command.

■

QssDCC - is returned if the radio has loaded its default set-up and has
not yet received a ‘set receive frequency’ command.

These commands invoke an immediate reply.

Exit CCR Mode

Description

The radio initiates a software reset (same as for “^”), and exits CCR mode.

Command

E005B
Where:
Parameter

Effect

Value

ASCII letter E indicates it is an exit command

ASCII hex number “00” indicates it has no parameter

ASCII characters “5B” are the checksum

This command is immediate. The radio will reset.

Computer-Controlled Radio

151

7.9

Unsolicited Messages from the Radio

7.9.1

Summary and Examples
The following messages may be returned to the DTE without user
intervention.
Message

Examples:

7.9.2

Cmd

Function

Vssxx..xxCC

Selcall decode sequence

MsspCC

Ptt exceeds max transmit limit

MssrCC

CCR initialised

V0612345-18

Sequence 12345 detected

V065E5E5-EE

Sequence 55555 detected (E is repeat tone in this case)

M01P02

Transmit timeout warning (10s before inhibit)

M01R00

CCR mode entered

PTT exceeds max transmit limit

Description

The radio uses this response to advise the control head that PTT is about to
timeout.
For control heads with user interfaces, the warning threshold is the duration
timer configured for the network minus 10s.

Response

MsspCC
Where:
Parameter

Effect

152

Value

ASCII letter M denotes the message

ASCII hex number ss is the number of parameters (always “01”)

ASCII letter P denotes a PTT being applied that has exceeded the
default transmit timer warning threshold

ASCII hex number CC is the checksum

Whenever the radio reaches its maximum transmit period the radio will
inform the control head. After a further short delay the radio will turn off
the transmitter.

Computer-Controlled Radio

7.9.3
Description

Selcall Decode Sequence
The radio sends this message every time the decoder tone buffer is emptied,
in accordance with the notification criteria set by the “I” command. See
“Set Selcall Parameters” on page 146 and “Notify Buffer Size” on page
153.
The sequences received are represented with the tones from the toneset.
Repeat tones and gaps will be forwarded as is.

Response

Vssxx..xxCC
Where:
Parameter
V

ASCII letter V denotes the Selcall decode message

ASCII hex number ss is the number of parameters

xx..xx

are the tones decoded within the time window specified by the
notify parameters as follows:

CC
■

Effect

7.9.4
Description

Value

■

ASCII digits 0 to 9

■

Special tones are represented with ASCII letters A to F

■

Gap. A gap in CCR is equal to the tone period set by the Selcall
Parameter command

ASCII hex number CC is the checksum

CC is the checksum as defined

When the radio receives the given SELCALL sequence the radio sends the
decoded sequence to the DTE.

Notify Buffer Size
The number of tones to notify, set by the selcall parameter command, allow
the user to define the size of the decode tone buffer. This buffer sets the
maximum time period that the radio will decode and log tones before
reporting to the user, when continuously receiving valid selcall tones. The
timer is calculated as follows:
Tmax = (N x P) + P

Computer-Controlled Radio

153

Where:
Parameter

Value

Tmax

Notify buffer maximum time

Number of tones

Tone period

The buffer timer is started after at least one valid tone has been detected.
The buffer timer is reset if a gap is detected prior to expiry.
The notify parameter also sets a filter that allows the user to suppress decode
sequences from being reported if they consist of less than the selected
number of tones in a continuous sequence, as follows:
■

If the decode buffer contains less than the selected number of tones when
it is reset the contents shall be discarded.

If a radio in CCR receives a speech call it is very likely that the user will see
this response with garbage decode sequences (1 or 2 tones) if the filter is
removed.
The additional tone period added to the buffer time allows the radio to
detect and report if a gap was present or not after the sequence detected.

154

Computer-Controlled Radio

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Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.4
Linearized                      : No
Modify Date                     : 2006:03:20 11:00:11+12:00
Keywords                        : Tait, Mobile, Radio
Create Date                     : 2006:03:20 09:42:23Z
Page Count                      : 156
Page Mode                       : UseOutlines
Producer                        : Acrobat Distiller 4.05 for Windows
Mod Date                        : 2006:03:20 11:00:11+12:00
Author                          : Tait Electronics Ltd
Creation Date                   : 2006:03:20 09:42:23Z
Metadata Date                   : 2006:03:20 11:00:11+12:00
Creator                         : Tait Electronics Ltd
Title                           : TM8000 3DK Hardware Developer’s Kit Application Manual

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TM8000 3DK Hardware Developer’s Kit Application Manual TM8000/TM8100 TM8200 Developers Manual/TM8100 TM8100

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