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| Document ID | 1007771 |
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| Document Description | User Manual |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 23.38kB (292236 bits) |
| Date Submitted | 2008-09-26 00:00:00 |
| Date Available | 2008-09-26 00:00:00 |
| Creation Date | 2008-09-11 16:59:48 |
| Producing Software | PDF-XChange 3.60.0118 (Windows XP) |
| Document Lastmod | 2008-09-15 11:55:20 |
| Document Title | User Manual |
ZRT SERIES
RADIO MODEMS
SETUP, INSTALLATION
OPERATING MANUAL
ZRT Manual
Page 1 of 37
Rev. J – 11 September 2008
ZRT Manual
Page 2 of 37
Rev. J – 11 September 2008
CONTENTS
INTRODUCTION ........................................................................................ 4
PRODUCT OVERVIEW.............................................................................. 5
1.1
1.2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
PRODUCTS COVERED...........................................................................................................4
IMPORTANT NOTICES..........................................................................................................4
GENERAL ................................................................................................................................5
TRANSMITTER........................................................................................................................5
RECEIVER................................................................................................................................5
MPU CONTROL ......................................................................................................................6
PROGRAMMING & CONFIGURATION............................................................................... 6
SOFT MODEM: ........................................................................................................................6
MODES OF OPERATION .......................................................................................................6
HANDSHAKING.....................................................................................................................6
ADDITIONAL FEATURES...................................................................................................... 7
SPECIFICATIONS ....................................................................................... 8
3.1
3.2
TECHNICAL SPECIFICATIONS ............................................................................................8
APPROVALS AND LICENSING .......................................................................................... 10
PRE-PROGRAMMED CHANNEL PLANS ............................................ 12
SETUP & INTERFACING......................................................................... 15
4.1
4.2
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.16
5.17
5.18
5.19
INTERNAL CONSTRUCTION ............................................................................................. 15
INTERFACE PORT PIN CONNECTIONS ........................................................................... 15
12VDC POWER...................................................................................................................... 17
ANTENNA PORT.................................................................................................................. 17
CHANNEL SWITCHES......................................................................................................... 17
PROGRAMMING .................................................................................................................. 17
RF POWER ............................................................................................................................. 17
TIME-OUT-TIMER................................................................................................................. 18
INTERNAL MODEM............................................................................................................. 18
RADIO DATA FORMATS..................................................................................................... 19
FORWARD ERROR CORRECTOR....................................................................................... 19
SQUELCH TAIL (DRIBBLE BITS) ELIMINATION ............................................................. 19
SERIAL INTERFACE & HANDSHAKING .......................................................................... 19
TRAFFIC PROTOCOL & ROUTING MODES...................................................................... 21
TRANSMIT & RECEIVE TIMING......................................................................................... 22
POWER CONSUMPTION..................................................................................................... 25
POWER SAVE MODE ........................................................................................................... 25
“RSSI” RECEIVE SIGNAL STRENGTH INDICATION....................................................... 25
STATUS LEDS........................................................................................................................ 26
STORE & FORWARD ............................................................................... 27
6.1
6.2
6.3
UK MPT1411/VNS2111 CHANNELS ................................................................................. 12
UK MPT1329 CHANNELS.................................................................................................... 14
STORE & FORWARD BASED ON CLIENT PROTOCOL. .................................................. 27
MODBUS................................................................................................................................ 27
RFT ROUTING PROTOCOL................................................................................................. 29
INSTALLATION........................................................................................ 32
7.1
7.2
7.3
7.4
7.5
7.6
ZRT Manual
INTRODUCTION .................................................................................................................. 32
POWER SUPPLIES................................................................................................................. 32
EFFECTIVE RADIATED POWER (ERP) .............................................................................. 32
ANTENNAS, COAX FEEDERS & PERIPHERALS .............................................................. 33
MOUNTING & INSTALLATION ......................................................................................... 35
FIXING DETAILS................................................................................................................... 35
Page 3 of 37
Rev. J – 11 September 2008
1
1.1
INTRODUCTION
PRODUCTS COVERED
This manual covers the ZRT Series of low cost, high performance radio modems designed for
data applications in commercial and industrial systems.
The ZRT is an advanced, simplex/half-duplex, data radio for transmission of serial data.
Versions are available with three different serial port configurations:A true RS232 interface full handshaking.
As above but with 5V TTL voltage levels on the interface rather than RS232 levels.
An RS232/RS422/RS485 interface with software selection of required mode. (RTS/CTS
and DSR/DTR Handshaking lines looped back to each other in RS232 mode)
Information is provided to assist with configuration, installation, and operation of the products
in point to point or point to multi-point applications. A separate programming manual covers
the use of the associated WinA4P software for programming and configuration of the radios.
Component level servicing is not covered in this document; if the product fails its first line
testing it should be returned to a service centre.
1.2
IMPORTANT NOTICES
1.2.1
Copyright
All rights to this manual are the sole property of R.F. Technologies Ltd. The copying of the
manual in whole or in part by any method without written permission is strictly prohibited.
1.2.2
Right To Change
1.2.3
Software
1.2.4
Safety Critical Applications
In the interest of improvement, R.F. Technologies reserves the right to change the technical
specifications or functions of its product without notice.
R.F. Technologies Ltd software is delivered “as is”. R.F. Technologies Ltd does not grant any
kind of warranty or guarantees on its saleability or it’s suitability for use in specific
applications.
Under no circumstances is R.F. Technologies liable for any damages arising from using the
software.
The copyrights relating to all software is the sole property of R.F. Technologies Ltd.
Any coping, editing, translating or modifying is strictly forbidden without prior written consent
from R.F. Technologies Ltd
The ZRT has not been designed for, nor is it intended for, use in safety critical or life support
applications. No functional warranty is given if the product is used in such applications.
1.2.5
Use
The ZRT radio modems have been designed to work on various licensed and license-free
frequency bands in use around the world. In the license-free bands, the user must ensure that
the radio modem is used under the terms & conditions applicable to the use of the bands
concerned.
In licensed bands, the user must obtain permission and the necessary licenses from the relevant
authorities.
ZRT Manual
Page 4 of 37
Rev. J – 11 September 2008
2
2.1
PRODUCT OVERVIEW
GENERAL
The ZRT Series has been designed as a range of high specification, low cost radio modems for
stand alone applications or for integration into OEM products.
Through the use of advanced DSP technology, the design has been optimised for reliability and
low current consumption, making the ZRT suitable for operation on remote sites without mains
power.
Applications include security, command & control, data logging, SCADA, telemetry, remote
switching or any similar applications where serial data needs to be transmitted.
The ZRT is available with three different serial interfaces:An RS232 interface with all signalling lines to allow full handshaking if required.
A TTL version of the unit which uses 5V TTL voltage levels on the serial interface
connector rather than RS232 signalling levels, but is otherwise the same.
A version with an RS232/RS422/RS485 interface. Required interface mode is selected
using the configuration software. In RS232 mode, the RTS line is looped back to CTS
and the DSR line is looped back to DSR. RS422/RS485 half-duplex (2-wire) or full
duplex (4-wire) modes are both supported.
The data rate on the serial interface can set to a range of values from 150 baud to 38,400 baud,
while the over-air data rate can be independently set to a range of values between 150 baud and
9,600 baud. If high throughput speeds are not required, the modem can be set to a slower overair rate to take advantage of the associated improvement in receiver threshold.
The ZRT is available with two different transmit powers. The low power version meets the
licence-exempt ETS300-220 specification while the higher power 5W version meets the tougher
ETS300-113 and the USA and Canadian specifications.
2.2
TRANSMITTER
The transmitter frequency can be user programmed anywhere within it’s pre-aligned
bandwidth. There are two power versions available, 10mW to 750mW and 100mW to 5W. The
transmit power of any particular hardware version can be set accurately within the relevant
range under software control.
2.3
RECEIVER
The receiver is a very low current double conversion superheterodyne with an active balanced
mixer for very good intermodulation performance. Careful attention to spurious response,
adjacent channel and blocking performance, makes the product ideal for crowded telemetry
channels.
To achieve high performance the programmable bandwidth of the receiver has been limited (for
UHF it is 10MHz, + 5MHz from centre frequency), full details are in the technical specification
section.
Should re-alignment be required, the unit can be returned to our service centre.
ZRT Manual
Page 5 of 37
Rev. J – 11 September 2008
2.4
MPU CONTROL
The Microprocessor (MPU) is the heart of the product and at the centre is a 128k flash
microprocessor that controls all the interface circuits to the radio module and external
input/outputs. As well as the control functions, the processor provides DSP functionality that
enables modem operation between 150 and 9,600bps. The processor has 128k of flash memory
from which the code is executed and internal EEPROM for storing programmed parameters.
2.5
PROGRAMMING & CONFIGURATION
2.6
SOFT MODEM:
The parameters of the ZRT are PC programmable via the serial port. Full details of all the
programmable parameters are covered in the separate programming manual. Details of cables
and adaptors needed for the various interface versions are given in Section 5.6.
The ZRT has a “soft modem” which allows over-air transmission at rates between 150bps and
9,600bps using a range of different modulation schemes. The over-air rate can be selected by
the operator to optimise link performance.
2.7
MODES OF OPERATION
2.7.1
Transparent Operation
2.7.2
Protocol specific modem
The ZRT can operate transparently without packetising the data and without adding any other
overheads, thereby maximising data throughput rates. It requires no knowledge of the data it is
transmitting. Data is simply transmitted and received with minimal delay.
The radio recognises a complete frame and only transmits and receives data conforming to that
format. No addressing of radios or routing of data is performed. Protocols such as MODBUS &
DNP3 can be supported in this way.
2.7.3
Routing modem
2.8
HANDSHAKING
The radios recognise a protocol specific frame and the address to which the frame is to be sent.
Routing information must be stored in each radio for each destination address that requires the
use of repeaters. Any radio in the system can operate as a repeater. The radio does not perform
any acknowledgement or retries. Any protocol using a fixed address field such as MODBUS
can be supported.
On the RS232 Full Handshaking and TTL versions, transmission control can either use RTS
control signals or be configured for automatic initiation of transmission on receipt of serial data
at the traffic interface. In either case, the radio provides a CTS output which can optionally be
used for flow control.
On the RS232/RS422/RS485 version, transmission is automatic when transmit data is applied.
The DSR line is internally looped back to DSR and, when configured for RS232 mode, the RTS
line is also looped back to CTS.
In all versions, the radio incorporates a 1,024 byte internal buffer to cope with situations where
the interface data rate is higher than the over-air rate.
ZRT Manual
Page 6 of 37
Rev. J – 11 September 2008
2.9
ADDITIONAL FEATURES
The ZRT incorporates the following additional features which enhance the usability of the
product and assist with the operation and maintenance of systems using the product:-
2.9.1
Status LEDs:
2.9.2
Time-out Timer
2.9.3
Power-Save Modes
The ZRT Radio Modems have a number of front panel LED’s to enable the operator to see at a
glance the status of the product and the serial data port.
The transmitter within the ZRT has a user programmable time-out timer which allows the
maximum continuous transmission time to be set in order to prevent channel blocking due to a
fault.
The ZRT has both internally controlled and externally controlled power-save modes to reduce
overall power consumption to extremely low levels for operation on sites without mains power.
2.9.4
Squelch Tail Elimination
2.9.5
Forward Error Correction
As a user programmable option, the ZRT can also operate in a packetisation mode where
framing characters are added at the start and end of the user's message prior to transmission
and stripped off again at the receive end prior to passing the user data to the interface
connector. This can be useful in getting rid of any spurious characters which may otherwise be
generated at the end of messages by squelch noise as the receiver mutes and which can affect
old or non-tolerant protocols.
In a high interference environment, enabling packetisation will often help to block reception of
the interfering signals.
The ZRT allows an optional forward error correction to be switched in when the over-air data
rate is 9,600bps. This will improve error performance, but there is an associated data
throughput overhead of around 30% which therefore reduces the effective transmission rate for
the user data. The forward error corrector is not available at lower data rates as it offers no
significant performance enhancement at these lower rates.
ZRT Manual
Page 7 of 37
Rev. J – 11 September 2008
3
SPECIFICATIONS
3.1
TECHNICAL SPECIFICATIONS
3.1.1
General
Frequency Range:
ZRT169/170 138 - 175MHz
ZRT225
175 - 225MHz
ZRT450/470 406 - 512MHz
ZRT869
863 - 870MHz
(50MHz – 950MHz to special order)
Power Requirements: 12VDC (10V – 15.5DC)
Standby:
Receiver on & decoding:
Transmitting:
<75uA
<70mA
300mA to 2.1A dependent on Tx power
Number of Channels: 80 sequential or 32 discrete user programmable channels.
Min. Programmable
Channel Step:
6.25kHz or 5kHz
Channel Spacing:
12.5kHz, 20kHz or 25kHz
Operating Temp.
Stability:
2ppm
Construction:
Aluminium enclosure.
Size:
75mm W x 130mm L x 30mm H (excluding brackets and connectors)
Mounting:
Screws to a flat surface.
Weight:
250g
Connectors:
DC Power
Serial Data
RF
LED Indicators:
TX, Busy, System, RXD, TXD
3.1.2
–30 to +60ºC
2-way Klippon Type
9-way D-Type Female
BNC (50 ohm)
Transmitter:
RF Output Power:
ZRT 169/450/869
ZRT 170/225/470
10mW - 750mW
50mW - 5Watts
Bandwidth:
VHF
UHF
869
10MHz without re-alignment
12MHz without re-alignment
30MHz without re-alignment
Internal Modulation: Programmable for FFSK, 2-Level FSK, GMSK or 4-Level FSK.
Max. Deviation:
± 7.5kHz max
Duty Cycle
up to 70%
Adj. Channel Power: >65dB at 12.5kHz
Spurious Emissions:
As per ETS300-113
Rise Time:
< 9mS
ZRT Manual
Page 8 of 37
Rev. J – 11 September 2008
3.1.3
Receiver
Sensitivity:
0.25uV (-119dBm) for 12dB SINAD de-emphasised
0.355uV (-117dBm) for 12dB SINAD flat
Bandwidth:
VHF
UHF
869
5MHz without re-alignment
10MHz without re-alignment
20MHz without re-alignment
Spurious Response:
ZRT 169/450/869
ZRT 170/225/470
>65dB
>80dB
Blocking:
ZRT 169/450/869
ZRT 170/225/470
>85dBuV
>90dBuV
Intermodulation:
ZRT 169/450/869
ZRT 170/225/470
>60dB
>70dB
Adjacent Channel:
>65dB at 12.5kHz
IF Frequencies:
45MHz and 455kHz
Spurious Emissions:
ZRT 169/450/869
ZRT 170/225/470
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