Midland Radio SD225U1 UHF DATA RADIO User Manual UG SD225

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Document ID	843031
Application ID	rgB8ihxpLb4G9DrGkfUQvg==
Document Description	USERS MANUAL
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	134.9kB (1686273 bits)
Date Submitted	2007-09-14 00:00:00
Date Available	2007-09-14 00:00:00
Creation Date	2006-10-26 23:04:12
Producing Software	Acrobat Distiller 5.0 (Windows)
Document Lastmod	2006-10-26 23:04:12
Document Title	Microsoft Word - UG-SD225.doc
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Document Author:	JSLim

User Guide
Contents
Introduction
Preparing for use
Unpacking and inspection
Description of modem 3
External Connections 3
Pin Outs 4
Channel Selection
Operation
Transmit/Receive Operation
Serial Commands
Status Indicators
Programming
Installation 5
Antennas 5
Power sources
Cabling
Fixing
Safety and general information
10
Warranty and repairs 12
Care of the equipment 12
Disposal / Recycling 12
Introduction
The SD225 range is a 1 to 5 Watt PMR data modem at VHF and UHF frequencies
The SD225 is housed in a rugged cast-aluminium box sealed to IEC 529 (IP54) making it suitable for a wide range of mobile and fixed applications.
All SD225 modem units meet the essential requirements of the relevant directives. In order to maintain this compliance the installation and safety information must be
adhered to at all times.
•
The SD225 modem must only be installed where unintentional contact cannot be made. The surface of the device may be hot to touch under certain transmit
conditions. The SD225 is not designed for permanent transmission. If prolonged transmission periods are used, the unit will become hot and will require an
additional heatsink to be fitted.
•
When fitting the modem into a fixed installation, care must be taken in the routing of all cabling such that the insulation cannot become damaged.
•
The recommended supply sources for use with the SD225 are a standard 12V / 2A dc supply, but is capable of operating in the range 9V - 18V.
Preparing for use
Unpacking and inspection
Unpack the modem and check that you have received the following items:
•
SD225 modem
•
User Guide (this document)
If any of these items are missing, please contact your supplier.
Description of modem
The SD225 is a network free, point to point data radio that offers great flexibility in varied applications where wireless data or voice communication is needed.
It can be used as a transparent radio, with no internal modem fitted, to allow users to facilitate the use of their own modem and protocol. The correct signal levels need to
be used with the use of separate control lines, see the pin out table below.
The SD225 can also be fitted with a Bell 202/V23 modem (1200 baud rate). The internal modem allows communication with a pc using RS 232 for the data and control
lines. For further details, please refer to the modem manual.
SD225 has standard radio features available which are associated with a private radio. This includes CTCSS and DCS, software controlled squelch, time out timer
options and busy channel lockout as listed below (not all available with option modem fitted). There is a microphone input and speaker output to allow speech to be
transmitted and received.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Compact and rugged die cast box
Resistant to dirt, dust and water ingress (IP54 rated)
Network free, point to point communication
1/5 watt programmable output power
Synthesised operation with 16 channel capability
SAT when used with Bell 202/V23 modem or speech
Programmable 12.5 / 25kHz channel spacing
External modem / Direct FM
Internal modem options available:
Bell 202/V23
‘Busy’ output (can be set active high or low)
9 – 18 volt supply input
Busy Channel lockout
Time out timer
External Connections
1.
2.
HD 9-way d-type (data, control signals and power supply)
BNC antenna connector
PIN Outs
DB-9 PIN OUT table with input and output levels
Pin No.
link option
link option
link option
link option
Function
Data modulation
IN
(used with an ext.
modem)
RS 232 data IN
Data unfiltered
OUT
(RX disc)
RS 232 Data OUT
PTT In
(Tx Key) /
Program: READ
Description
A/c coupled signal directly injected to MOD through
data low pass filter without pre-emphasis.
Link 409 fitted. Link 412 not fitted
Input to Bell 202/V23 modem
Link 409 not fitted and link412 fitted
Discriminator audio from the D-200. Unprocessed AF
signal (prior to tone filtering and de-emphasis)
Link 413 fitted and link 414 not fitted.
Output from Bell 202/V23 modem
Link 413 not fitted and link 414 fitted
Signal, which keys the transmitter. Is an active low
signal with an internal pull up resistor. If required can
be converted to active high using link options.
Note: If the option modem board is installed, a
jumper board can select RS-232 signal levels. See
Modem manual
Program : READ used for outputting programming
data from mode
Ground
+Ve
Ground connection to chassis of the radio.
Power connection:
Busy
(CD)
Logic level output to indicate presence of a carrier.
(If required, link changes enable the busy line to be
active high)
Note: If the option modem board is installed, a
jumper board can select RS-232 signal levels. See
Modem manual
MIC IN /
Program : WRITE/
Serial command
SPEAKER OUT
Audio signal that is filtered (high pass and preemph) then follows same route as data mod through
LPF. Sub-audio tone is mixed with audio after the
LPF.
Used for inputting programming data and use of
serial command
Audio output from the audio amplifier.
Filtered by tone-filter and de-emphasis circuit.
Signal Type
Analogue signal
1KHz audio at 60% peak
dev. input level =100 to
120mVrms
RS232 level
I/O
I/P
Analogue signal
1KHz audio at 60% peak
dev. produces
200 to 300mVrms
RS 232 levels
O/P
TTL level
0V = Tx
open cct = Rx
I/P
I/P
O/P
RS-232 level (option)
+12V = Tx
-12V = Rx
TTL level (RS 232
converter in cable
0V (Chassis)
+12 Volts nominal
9v-18v extreme
TTL level
0V = carrier
5V = no carrier
RS-232 level (option)
+12V = carrier
-12V = no carrier
1KHz audio at 60% peak
system deviation
input level =
6 to 8Vrms
TTL level (RS232 converter
in cable)
1KHz audio at 60% peak
dev. produces nominal
1Vrms @ 8Ω
1/P
O/P
I/P
I/P
O/P
Operation
Channel Selection
Channels are selected by the use of internal switches and can be set as shown below. The top 4 screws will need to be removed to gain access to the switches, care
must be taken to avoid any damage which could invalidate the warranty. The channel can also be changed by a serial command inputted from the external control
system.
Figure: Setting of channel selector switch for each channel
Transmit/Receive Operation
The SD225 is put into transmit/receive either by using TTL levels, RS 232 levels or serial command, depending on the application and modem set up.
When the radio is used with no internal modem, TTL levels (pin 3 on DB9) can be used. The default condition is active low for transmit, and active high, or not
connected, for receive. It is possible to alter the polarity of this control signal by adding components, refer to the pin out table for details.
If an internal modem is fitted the levels used need to be RS232 and a jumper board needs to be incorporated in the correct position to allow correct operation, see
modem manual.
The TX serial command (see later for further details) can also put the radio into transmit, until the rx serial command is received (pin 8 of DB9).
Serial Commands
The modem can be controlled by using the serial command (pin 8) , sending commands to the radio such as PTT or change channel
The format for these commands (asynchronous) are:
•
baud rate: 4800 bit/sec
•
Data Bit: 8 bit, non parity
•
Stop Bit: 1 bit
•
MSB first transmission
Each serial command consists of 3 bytes. The first byte is the command, the second is data required by the command and the third is the check sum to validate
contents
Byte0
ST
Byte1
ST
Byte2
ST
1st Byte (command)
SP
2nd Byte (data)
3rd Byte (check Sum)
SP
SP
Transmit command and data (To SD225)
Mode
Transmit command (byte0)
Transmit Data (byte1)
1.
2.
Channel Change
0 x 64
0 x 61
0x??*: required channel
R(0x72) : Rx mode
T(0x74) : Tx mode
Check sum (byte2)
Transmit command + data
(0x64 + channel)
(0x61+0x72)
(0x61+0x74)
Modem test mode
0x75
0x78 : enable test data
0x79 : disable test data
(0x75 + 0x78)
(0x75 + 0x79)
RTX Mode Send
*?? = number of required channel
Receive Command and data (response from SD225)
Mode
Process Complete commands
Transmit Command
(byte0)
0xaa
0x55
Transmit data (byte1)
Check sum (byte2):
Transmit command + data
ACK
NACK
If byte2 and the sum of byte0 and byte1 are the same, the SD225 will send ACK (acknowledge) and execute command. If this is not the case, then the SD225 sends
NACK (not acknowledge).
User would go into next step if receives ACK data. If user receives Nack data, user should send command again.
Example) To change from 1st Channel to 2nd Channel, the change command is: ( 0x64,0x02 , ( 0x64 + 0x2 )) to Radio. If Byte2 and sum of Byte0 and Byte1 among
received data are same, radio sends ACK and changes to 2nd channel. If not, radio would send Nack data
Status indicators
The LED indicates the current status of the radio and if an external speaker is connected to pin 9 of the DB-15, audible tones can be heard under certain fault conditions.
The details are shown below:
STATUS
DESCRIPTION
POWER ON
Busy Channel
Correct Call (with SAT)
Transmit
Transmit Not Allowed
LED COLOUR
Green-Orange-Red
Orange
Green
Red
AUDIBLE TONE
Busy Channel lockout
Time out Time
Before 5S T-O-T
EEPROM Error
Out of lock
Communication error with Modem
MCU
Transmit Hang on time
Two Green flashes
One Green flash
One Green flash
One Orange flash
Four Yellow flashes
Green LED flash
Single Beep Tone
PROGRAM
Read Mode
Write Mode
Red LED flashes
Green LED flashes
SQUELCH
PROGRAM MODE
Initial data load
Open Squelch Mode
Close Squelch Mode
Save Squelch Mode
Green-orange-red
Three Green flashes
Two Green flashes
One Green flash
NORMAL
WARNING
Single Beep Tone
Single Beep Tone
Programming
The data modem is a pc programmable modem. The parameters available for programming include:
•
Frequency, channel spacing and sub-audible tones on a per channel basis
•
Standard radio settings such as power save mode, scan, tx lockout, tx timeout
•
Squelch enable
•
Modem options when the Bell 202/V23 is fitted, such as data settings (flow control, block size etc) and timings.
The pc program also allows for squelch adjustments and calibration
Installation
Antennas
It is important that any antennas are installed in a suitable location with an adequate ground plane. Ideally, multiple antennas should be separated by a minimum of a
wavelength (at the lowest frequency), whilst still retaining a good ground plane for each antenna. Therefore, for a 400MHz system, the ideal separation should be a
minimum of 0.75m, and for 150MHz system the minimum should be 2.5m.
Warning: If installing an antenna near people it is necessary to ensure the minimum separation is maintained. This particularly important where prolonged exposure is
likely.
Power sources
It is important that a “clean” source of power is used for the 12V supply to the modem
Cabling
If possible, run RF cables separately from other cables and keep RF cables apart from one another to avoid interference / coupling.
When fitting the modem into a fixed installation care must be taken in the routing of all cabling such that the insulation cannot become damaged.
Fixing
We recommend that the SD225 is securely fixed to a surface, either directly, or with a suitable bracket. The fixing hole centre dimensions are as shown.
The modem can be attached to any surface by using suitable size screws through the M3 holes in the mounting flanges.
Note: We do not recommend that the SD225 is fixed by cable ties to any wiring looms.
Safety and general information
Important information on safe and efficient use of your Radio device
Exposure to radio frequency energy
Your modem is a high power radio transceiver. When it is on, it receives and also sends out radio frequency (RF) signals. To help minimise human exposure to RF
electromagnetic energy, keep transmission time to 50% or less.
As with all radio devices, holding the antenna affects transmission quality and may cause the radio to operate at a higher power level than required. Do not hold the
antenna when the radio is in use.
Do not use radios with damaged or modified antenna, this may violate compliance with relevant international standards.
Where prolonged human exposure is likely, the minimum separation from the antenna should be 0.8m.
Electromagnetic interference/compatibility
Most modern electronic equipment is shielded from RF energy. However certain electronic equipment may not be shielded against RF signals. The modem needs to be
switched off in any facility where posted notices instruct you to do so to avoid electromagnetic interference or compatibility conflicts. Special care should be taken near
facilities such as hospitals or health care centres may be using equipment that is sensitive to external RF energy.
Medical devices (Pacemakers)
If you use any personal medical device, consult the manufacturer of your device to determine it is adequately shielded from RF energy. Your physician may be able to
assist you in obtaining this information.
Vehicles with airbags
Air bags inflate with great force. Do not place a radio in the area over an airbag or in the airbag deployment area, any radio may be propelled with great force and cause
serious injury to the occupant of the vehicle.
Potentially explosive atmospheres
Turn off your modem prior to entering any area with a potentially explosive atmosphere, unless it is a radio type especially qualified for use in such areas. Do not remove
install or charge batteries in such areas. Sparks in potentially explosive atmospheres can cause an explosion or fire resulting in bodily injury or death.
Potentially explosive atmospheres include fuelling areas such as petrol stations, below decks on boats, fuel or chemical transfer or storage facilities, vehicles using liquid
petroleum gas (such as propane or butane); areas where the air contains chemicals or particles such as grain, dust or metal powders, and any other area where you
would normally be advised to turn off your vehicle engine. Areas with potentially explosive atmospheres are often but not always posted.
Warranty and repairs
The SD225 is a low maintenance device. Once installed it requires no ongoing maintenance.
In the event that your SD225 modem needs repair, return your radio to an authorised Midland Radio supplier. Do not disassemble, modify or repair the unit unless the
work is carried out by a Midland Radio approved supplier. Incorrect assembly, modification or repair may cause irreparable damage to your unit and will invalidate any
warranty.
Care of the equipment
Do not immerse the SD225 modem in water or other fluids.
Do not use solvents or spirits for cleaning as this may cause
damage to the case materials.
Do not over tighten connection to the modem.
Disposal / Recycling
The SD225 is a Class 3 product in accordance with the Waste of Electrical and Electronic Equipment (WEEE) Directive. Disposal of this class of equipment must be
carried out through an authorised recycling centre or contact your supplier.
FCC warnings:
Published by Midland Radio Corp.
Any queries regarding information in this manual, please contact the Technical Services Group Leader at the above address.
Information provided in this document is believed correct at time of printing but is subject to change without notice.
Midland Radio will not accept liability for any loss, damage or costs howsoever caused as a result of the information provided.

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Create Date                     : 2006:10:26 23:04:12+09:00
Modify Date                     : 2006:10:26 23:04:12+09:00
Page Count                      : 20
Creation Date                   : 2006:10:26 14:04:12Z
Mod Date                        : 2006:10:26 14:04:12Z
Producer                        : Acrobat Distiller 5.0 (Windows)
Author                          : JSLim
Metadata Date                   : 2006:10:26 14:04:12Z
Creator                         : JSLim
Title                           : Microsoft Word - UG-SD225.doc

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