RF DataTech ART400 ART 400 Series Radio Modem User Manual ART 400 Ver 1 2 Rev1

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Document ID	234343
Application ID	j5By+3KK9VTqJQsiekTNMA==
Document Description	ART 400 Series Installation Operation and Programming Manual
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Date Submitted	2002-04-01 00:00:00
Date Available	2002-05-24 00:00:00
Creation Date	2002-03-28 16:53:20
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Document Title	Microsoft Word - ART 400 User Manual Ver 1-2_Rev1.doc
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Document Author:	danhuynh

ART SERIES
INSTALLATION, OPERATION
& PROGRAMMING MANUAL
COVERS
ART400, (ART400T), (ART400R)
SYNTHESISED
RADIO MODEMS & REPEATERS
October 2001 ISSUE 1. rev1.2
CONTENTS
1.0
INTRODUCTION
1.1
Products Covered
1.2 Introduction
1.3
Overview
1.3.1
Radio Frequency (RF) Section
1.3.2
Transmitter
1.3.3
Receiver
1.3.4
MPU Control & Interface Board
1.3.5
Software
1.3.6
Custom Software
1.3.7
Continuos Development
1.4
Channel Selection
1.5
Programmability
1.6
Low Power operation
1.7
Power Save Mode
1.7.1
Internal Power Save Mode
1.7.2
External Power Save Mode
1.7.3
Time Scheduling using the RTC
1.8
Soft Modem
1.9
RSSI Receive Signal Strength Indicator
1.10
Status LED’s
1.11
Optional Keypad & Display
1.12
R.F. Power
1.13
Local I.O.
1.14
12C Internal & External BUS
1.15
GPS
1.16
Internal/External Modem Operation
1.16.1
External
1.16.2
Tone Operated Switch (TOX)
1.16.3
Internal
1.17
Modes of Operation & Protocol Handling
1.17.1
Radio Modem Modes of Operation
1.17.1.1
Dumb Modem
1.17.1.2
Protocol Specific Modem
1.17.1.3
Routing Modem
1.17.1.4
Dial-up Modem
1.17.2
I.O. Modes of Operation
1.17.2.1
Isolated Network with Point to Point I/O Mapping
1.17.2.2
Network with Retrieved Data Access at Base Station
1.17.2.3
Externally Controlled Network
1.17.2.4
Custom Protocols
1.18
Network Management Software
1.19
Squelch Tail Elimination
1.20
Forward Error Correction
1.21
Automatic Frequency Control
1.22
TX Time-Out-Timer
1.23
Dual Control for Fully Duplicated Outstation
1.24
Programming, Service Installation & Management
Software
1.24.1
Programming Software
1.24.2
Installation Software
1.24.3
Service Software
1.24.4
Network Management Software
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1.25
Compatibility with other products
2.0
SPECIFICATIONS
2.1
Technical Specification:
2.1.1
General
2.1.2
Transmitter
2.1.3
Receiver
2.1.4
Internal Modem
2.1.5
Bit Error Rates
2.2 Approvals and Licensing
2.2.1
UK Approvals
2.2.2
European Approvals
2.2.3
Other Approvals
2.3 Operating Channels
2.3.1
UK Telemetry Channels
2.3.2
MPT1411 Channels
2.3.3
MPT1329 Channels
2.4
Options & Accessories
2.4.1
DIN Power Supplies with Chargers
2.4.2
DIN Mounting RF Power Amplifiers
2.4.3
DIN I/O Modules
2.4.4
Leads & Cables
2.4.5
RF Adapters & Parts
2.4.6
Enclosures
2.4.7
Manuals
2.4.8
Backup Batteries
2.4.9
Antennas
3.0
OPERATION AND INTERFACE
3.1
3.2
3.1.1
3.3.2
3.3.3
3.3
3.3.1
3.3.2
3.3.2.1
3.3.2.2
3.4
3.5
3.6
3.6.1
3.6.2
3.6.3
3.7
3.8
3.9
3.10
3.11
3.12
3.13
3.14
3.15
3.16
3.16.1
Exploded View
Operation & Interface Description
Simplex, Semi-duplex & Full Duplex
Single or Dual Antenna Operation
Coax Configurations
Repeater/Store & Forward
Repeater
Store & Forward
Single Unit Operation
Two Unit Operation
Memory Expansion & Programming Port
View Showing Memory Expansion Board
Memory Expansion Board
Firmware Download Tool
Additional Memory
Remote Firmware Download Module
Serial and RS232 Interface
Serial Port Pin Connections
Antenna Connections
12VDC Power
I2C BUS Interface
Audio & Line Interface
Switches
Control Interface
External Audio Path
Internal Modem
Transmission using RTS/CTS Handshaking
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3.16.2
3.16.3
3.16.4
3.16.4.1
3.16.4.2
3.16.4.3
3.16.5
3.16.6
3.16.7
3.17
3.18
3.19
3.20
3.21
3.22
3.23
3.24
Transmission without Hardware Handshaking
Data Reception
Transmit & Receive Timing
Receiver to transmitter Switching Times
Message Duration
Transmit to Receive Switching Times
Radio Data Format
Synchronous/Asynchromus Format
Transmit/Receive Timing
Error Reports
Time Out Timer
Power Save Mode
RSSI Output
Temperature Measurement
Input Voltage Measurement
Real Time Clock.
External I.O.
4.0
INSTALLATION
4.1
4.2
4.3
4.4
4.5
4.5.1
4.5.2
4.5.3
4.5.4
4.5.5
4.5.6
4.5.7
4.5.8
4.5.9
4.5.10
4.5.11
4.5.12
4.5.13
4.6
4.6.1
4.6.2
4.6.3
Introduction
Power Supplies
Effective Radiated Power (ERP)
Safe Distance Calculation
Antennas, Coax Feeders & Peripherals
Antennas
Types of Antennas
Omni-Directional Antennas
Directional Antennas
Patch Antennas
Antenna Mounting
Polarisation
Alignment
Antenna Coax Feeder
Cable length Verses Signal Loss at 500MHz
Coax Connectors
VSWR Measurement
Lightning Arresters
Mounting
ART Dimensions
ART Mounting
Antenna Connection an enclosure
4.6.4
Wall Mounting Enclosure
5.0
PROTOCOLS & APPLICATIONS
5.1
5.2
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
Store & Forward Using Clients Protocol
Network Routing Mode
AT Command Set
Power Saving
Call Set Up Procedure
Radio Routing
Wake Up Procedure
Implementing Registers
6.0
PROGRAMMING
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6.1 Introduction
6.2
Medium
6.3 Configuration of the A4P Program
6.4 Starting the Program
6.5
Connecting the ART for local PC Programming
6.6
Programming/Reading Radio
6.7
Opening Menu
6.7.1
Directory Display
6.7.2
Version Number & Compatibility Message
6.7.3
Edit Notes
6.8
Description of Main Edit Functions
6.8.1
Main Menu
6.8.2
Radio Mode
6.8.3
Frequency Range
6.8.4
Alignment Range
6.8.5
Channel Selection Mode
6.8.5.1
Number of Channels
6.8.5.2
Channel Increments
6.8.5.3
RXD Start Frequency
6.8.5.4
TX Start Frequency
6.8.6
Power Range
6.8.7
TX Power
6.8.8
Power Save Options
6.8.8.1
Save On Time
6.8.8.2
Save Off Time
6.8.8.3
Save Resume Time
6.8.9
Serial Number
6.8.10
Note Pad
6.8.11
Lockout Time Mode
6.8.12
Lockout Time
6.8.13
Audio Response
6.8.14
Carrier Mute
6.8.15
Menu Options
6.8.15.1
Return to Main Menu
6.8.15.2
Edit Channel Data
6.8.15.2
Edit Modem setup
6.8.15.3
Custom Menus
6.9
Modem Edit Menu
6.9.1
Radio Baud Rate
6.9.2
Radio Data Bits
6.9.3
Radio Parity
6.9.4
Radio Stop Bits
6.9.5
FFSK Tone Set
6.9.6
FFSK/SYNC/ASYNC
6.9.7
Serial Baud Rate
6.9.8
Serial Data Bits
6.9.9
Serial Parity
6.9.10
Serial Stop Bits
6.9.11
RTS/CTS Hanshake
6.9.12
DCD Operation
6.9.13
DTR Shutdown
6.9.14
Lead In Delay
6.9.15
Lead Out Delay
6.9.16
Embedded Control
6.9.16.1
Network I.D
6.9.16.2
Network Address
6.10
Edit Channel Data
6.10.1
Channel Data Screen
6.10.2
Description of Channel Data Menu Options
6.10.3
RX & TX Frequency
6.10.4
Next/Previous Channel
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6.10.5
Editing Channel
6.11
6.11.1
6.11.2
6.11.3
6.11.4
6.11.5
6.11.6
6.11.7
6.11.8
6.11.9
6.11.10
6.11.11
6.11.12
Calibrate Menu (Factory & Service Centre Options)
Test Max Power/Mod Balance
Set TX Frequency
Set RX Frequency
Calibrate Power
Set Peak Deviation
Internal Mod Level
Set Line Level
Cal RSSI
RSSI Test
Temperature Test
Input Voltage Test
Return to Main Menu
SOFTWARE & ANCILLARYITEMS
7.1
7.2
7.3
7.4
7.5
7.6
7.6.1
7.6.2
7.6.3
7.6.4
7.6.5
7.6.6
7.6.7
7.6.8
7.7
7.7.1
7.8
7.8.1
7.8.2
7.8.3
7.8.4
7.8.5
7.9
7.10
7.11
7.12
PC Software
Client Programming Software
Factory Programming Software
Bit Error Rate (BER) Software
Test & Alignment Software
Network Management Software
Installation
Operation within a network
Additional Features
Internal Temperature measurement
Input Power Supply Voltage
RX & TX Offset Frequency Measurement
& TCXO re-alignment
Local/Remote firmware upgrades
Future Software Developments
Non Intrusive Network management software
Ancillary Products
Power Supplies with Chargers
RF Power Amplifiers
DIN I.O. Modules
Enclosures
Leads & Cables
Adapters & Parts
Manuals
Backup Batteries
Antennas
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FCC Compliance Statement
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired operation.
WARNING
Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct
the interference at his own expense.
Industry Canada Certification
This device complies with Industry Canada RSS 119, under certification number TBD.
IC Class A Compliance
This device complies with the Class A limits for radio noise emissions as set out in the interferencecausing equipment standard entitled “Digital Apparatus,” ICES-003 of Industry Canada.
WARNING
To satisfy FCC/IC RF exposure requirements for mobile transmitting devices, a separation
distance must be maintained between the antenna of this device and persons during
operation. To ensure compliance, operations at closer than this distance in not
recommended. The following table show this distance for different gain of antennas:
Gain of Antenna
(dB)
Unity
10
12
Minimum Separation Distance
(metre)
0.5
0.7
1.0
1.3
1.6
2.0
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1
INTRODUCTION
1.1
PRODUCTS COVERED
1.2
INTRODUCTION
This Manual covers the R.F. Technologies ART Series Radio Modems and repeaters.
Information is provided to program, install, and operate the products in various
configurations.
With the built-in test software, first line “Go-No Go” testing can be easily performed.
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.
The ART Series are high performance, very low current consumption, dual Synthesised
Radio Modems, designed specifically for the Telemetry and Data market, where the fast
transfer of data is required over reliable wireless links.
The ART was designed as a result of research into market requirements for a product that
would work in a large majority of applications. As a result the ART will fit into almost any
system using licensed, or license exempt telemetry channels in the VHF, UHF & 900MHz
bands.
The ART product is unique in its use of a single flash microprocessor to control both the RX
& TX radio modules, external interfaces, and function as a full duplex modem with
programmable speeds up to 9600bps.
1.3
OVERVIEW
1.3.1
RADIO FREQUENCY (RF) SECTION
The ART employs separate receiver and transmitter modules connected to a common
microprocessor and interface board. The RF modules have separate synthesisers to enable
full duplex operation and in simplex operation facilitates very fast turn around times.
The ART has been specially designed with very low group delay filters to provide the best
path for high speed data signals. Each RF module is a self contained unit, that plugs into the
control board and in the unlikely event that a R.F unit fails, it can be easily replaced and sent
to our service centre for repair.
No attempt should be made to repair the unit except by experienced RF personnel with
Proper RF test equipment is available.
NOTE: Adjusting any of the controls within the RF module may degrade the transceiver's
performance or put its operation outside the approved specification.
1.3.2
TRANSMITTER
The transmitter can be programmed anywhere within a pre-aligned bandwidth, which is
within a wider tuneable F band, details of the bandwidths are in the technical specifications.
Both High power (20mW – 5Watts) and low power (10mW – 1Watt) products are available.
For ease of operation, all parameters are PC programmable with channel change duplicated
on the external switches.
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1.3.3
RECEIVER
The receiver is a very low current double conversion superheterodyne with an active
balanced mixer for very good intermodulation. Careful attention to spurious response,
adjacent channel and blocking performance, makes the product ideal for crowded telemetry
channels.
1.3.4
MPU CONTROL & INTERFACE BOARD
The Microprocessor (MPU) control & interface board is the heart of the product and at the
centre is a 128K flash microprocessor that controls all the interface circuits to the radio
modules and external Input/outputs. As well as the control functions, the processor provides
DSP functionality that enables full duplex modem operation between 150 – 9600bps.
The board also contains all necessary electronic potentiometers for full remote alignment and
control, these settings and other parameters are stored within the MPU ‘s non-volatile
EEPROM.
1.3.5
SOFTWARE
The processor has 128K of flash memory from which the code is executed and EEPROM for
storing programmed parameters. This ensures plenty of room for future upgrades and
custom applications.
1.3.6
CUSTOM SOFTWARE
Custom software or protocols for specific client applications, can be written and included
as PC programmable options in relatively short time scales and normally at nominal costs.
Further details can be obtained from the sales office.
1.3.7
CONTINUOUS DEVELOPMENT
The ART series has been designed with continuous development in mind and with less than
one third of the code space currently in use, there is plenty of room for protocols such as
MODBUS & TCPIP. For additional space (should it be required) a piggy back memory board
with a further 512k is available to download new code to the processor.
The fact that the product may have been deployed in the field, before changes have been
made, makes no difference, as changes and upgrades can easily be sent over the radio link
via our secure over air programming protocol.
1.4
CHANNEL SELECTION
The ART Series can be PC programmed with up to 80 discrete channels. Alternatively,
complete band allocations like the UK MPT1329 and MPT1411 bands can be downloaded
from the PC software, provided of course that the channels are within the products tuneable
bandwidth. Once programmed, channels can then be selected via rotary switches on the
front panel (or via the keypad on the display version) , from a PC program, via the serial port
or over the radio link.
1.5
PROGRAMMABILITY
Apart from one or two link selectable options (like single/dual antennas) , all the parameters
of the ART Series can be programmed via the serial port using either DOS or Windows
95/98 based software or over the radio link via the ART’s secure “over air programming
mode”. The individual program can be stored on disc for future use or printed.
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1.6
LOW POWER OPERATION
1.7
POWER SAVE MODE
The ART’s processor controls all the circuitry and power saves as a matter of course.
With no large DSP chips taking heavy current loads, the ART has probably the lowest current
consumption of any comparable radio modem on the market.
Although the 5watt product has very low current consumption, for extremely low current
applications the 1Watt version is recommended.
The ART Series has both internal and external power save modes.
1.7.1
Internal Power Save Mode
The microprocessor controls the on/off function of the receiver and after a pre-programmed
time the MPU will switch on the receiver to look for a carrier. If a carrier is not detected, the
transceiver goes back into sleep mode. If during the time the transceiver is awake a carrier is
received, the unit will stay awake. After the carrier drops out, the receiver will stay awake
until the programmed resume time elapses. Once the resume time has elapsed the
transceiver will go back into sleep mode. The save ON/OFF and resume time are all
programmable via the PC program.
1.7.2
External Power Save Mode
In the external mode the ON/OFF function of the modem is controlled by the host via the
DTR line.
1.7.3
Time Scheduling using the RTC
The ART contains an embedded Real Time Clock that can be used to wake the radio modem
to process information, report back or be ready for a poll. The RTC can be synchronised
during the wake-up communication for accurate time slotting. Note this mode is not
currently in use but will be implemented in the on going software development.
1.8
SOFT MODEM
1.9
“RSSI” RECEIVE SIGNAL STRENGTH INDICATION
The ART features a full duplex “soft modem” which offers unparalleled performance and
flexibility over a wide range of speeds and formats and enables future formats to be
downloaded from a PC or over the air. Within a 12.5KHz channel, the unit can be
programmed for 150-2400bps FSK/FFSK with Bell202 & V23 supported, 4800bps GMSK &
9600bps 4 Level FSK.
Each ART has an internal individually calibrated RSSI signal which is accurately measured
by an internal A-D converter. The signal strength can then be read in dB micro volts on a PC
connected to the serial port or remotely over the air. In the case of the LCD version the level
can be directly read from the display. Alternatively the raw 0-5VDC relative to the RSSI is
available on one of the connectors.
10
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1.10
STATUS LED’s:
The ART has 11 LED’s to enable the operator to see at a glance the status of the product and
the serial port in operation or on test.
1.11
OPTIONAL KEYPAD & DISPLAY
1.12
RF POWER:
1.13
LOCAL DIGITAL I.O.
Provision has also been made in the design to accommodate the development of a keypad
and liquid crystal display (LCD) for local programming without the use of a PC and for
displaying the status of the product and connected I.O. modules.
The ART’S are available in two power ranges: 10mW to 1 Watt for ultra low power
requirement, and 20mW to 5 Watts. The calibrated RF power level is PC and over air
programmable directly in watts & milli-watts with an accuracy of +/-1dB.
For high power (5-25Watt) applications a DIN power amplifier is available.
The ART Series has two local inputs and two outputs that can be configured and used under
the management and diagnostics software. For additional analogue or digital I.O the
ART700 Series of I.O. modules can easily be connected to the I2C bus interface.
1.14
I2C INTERNAL & EXTERNAL BUS
1.15
GPS
The ART Series features an I2C Bus which is used to communicate with other modules over
short or medium distances. The main feature of the bus is its address mode, which will only
wake up modules that are being addressed, thereby ensuring low power operation.
At the time of writing this manual a full range of analogue and digital I.O. modules are under
development, a list of them are in the specification section, with further details are available
from the sales office.
The ART Series can have a GPS module connected via the I2C bus, this enables time & date
stamping and asset tracking or more importantly, the location of nodes in large systems
where the downloading of network changes to specific nodes may be required.
1.16
INTERNAL/EXTERNAL MODEM OPERATION:
Both internal and external modems are supported, the external interface provides both flat
and de/pre-emphasised response for compatibility with older systems.
1.16.1
External
In external mode the 600 ohm input and output will accommodate a programmable range of
+3dBm to –20dBm. The output can be muted in the absence of a carrier.
1.16.2
Tone Operated Switch (TOX)
When using an external modem via the 600 ohm port, the soft decoder within the ART400
can be programmed to detect incoming FFSK or PSK signals. Once detected the transmitter
will key up and pass the incoming data.
1.16.3
Internal
The internal modem is PC programmable and is compatible with the many products in
operation around the world. In the internal mode, data is presented to the modem via the
RS232/TTL port at speeds up to 38400 and transmitted at the programmed baud rate.
Buffering is provided when the data rate is higher than the transmission rate.
11
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1.17
MODES OF OPERATION & PROTOCOL HANDLING:
1.17.1
Radio Modem Modes of Operation
The basic modes of operation of the radio modem are as follows:
1.17.1.1
Dumb modem
The radio has no knowledge of the data it is transmitting, data is simply transmitted and
received under hardware control with the option of RTS control or initiation of transmit after
receipt of serial data, with CTS providing an optional flow control.
This configuration is useful when expanding older systems where the radios must be
compatible with others of a different manufacture.
1.17.1.2
Protocol specific modem
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.
1.17.1.3
Routing modem
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.
1.17.1.4
Dial up modem
Hayes protocol is used to dial up the radio link which may include repeaters or store &
forward stations, the route information is not stored but is passed in the dial up command in
the form of a telephone number, once the link is established it is transparent and so
independent of the protocol being transported. This allows point to point protocols such as
SLIP and PPP (and hence TCP/IP) to be conveyed. Dial up is less efficient for small data
transactions because of the data exchanges carried out during the connect and disconnect
phases.
1.17.2
I.O. Modes of Operation
1.17.2.1
Isolated network with point to point I/O mapping
Inputs and outputs at outstations are mapped to corresponding outputs and inputs at the
master.
1.17.2.2
Network with retrieved data access at base station.
Instead of mapping data to physical inputs and outputs at the master, data is exchanged in
memory. The memory is accessible using MODBUS. The base station carries out its data
retrieval process independently of the MODBUS accesses.
1.17.2.3
Externally controlled network
In this mode the base station only carries out data retrieval when requested to do so by the
MODBUS interface.
The above modes are not independent processes but are run according to set up, it is possible
to configure operation to be a mix of all three. E.g. some physical I/O might be desirable at
the base station whilst the rest is passed by MODBUS, the base station can be set to keep
polling independently in order to maintain the physical I/O but can also mix in commands
passed by MODBUS.
12
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1.17.2.4
Custom Protocols
Custom protocols can be written and downloaded via a PC or over the air as systems require
change, thereby minimising disruption.
Should a special protocol or interface be required please contact the sales office.
1.18
NETWORK MANAGEMENT SOFTWARE
1.19
SQUELCH TAIL ELIMINATION
1.20
FORWARD ERROR CORRECTION (FEC)
1.21
AUTOMATIC FREQUENCY CONTROL
Network management software provides the user with direct access to the radio modems, for
diagnostics, programming & re-programming, safe downloading of new firmware and the
retrieval of data. All products on the I2C bus can be accessed in the same way.
For old or non tolerant protocols, where the presence of a mute (Squelch) tail may cause a
problem at the end of a message, a simple packetising option can be enabled.
Forward error correction is not implemented as standard in the modem because of the loss of
throughput in good signal situations, however FEC can be offered as a custom option if
required. Note that since the internal modem offers many data speeds data integrity can be
improved simply by running a lower speed.
The network management software, enables the outstation’s receiver and transmitter to be
frequency locked onto the base station s frequency and automatically re-aligned, thereby
minimising the effects of long term drift (ageing).
1.22
TX TIME-OUT-TIMER:
1.23
DUAL CONTROLLER FOR A FULLY DUPLICATED
OUTSTATION:
The transmitter within the ART has a time-out-timer which allows the maximum continuous
transmission time to be set in order to prevent channel blocking due to a to fault. The timer
operates in all modes and can be programmed in one second steps between 0 and 255
seconds. If programmed and the time is exceeded, transmission will cease until the action
that normally causes transmission is removed and then re-applied.
For Base Station applications the BRT Series is available, the ART products can also work in
a fully duplicated mode for critical outstation applications with the aid of an ART790 DIN
baychanger module.
1.24
PROGRAMMING, SERVICE INSTALLATION & MANAGEMENT
SOFTWARE
Dedicated PC software packages have been written that provide unrivalled versatility
combined with ease of use.
1.24.1
Programming software:
Programming software in DOS and Windows 95/98 is available for the ART Series.
1.24.2
Installation Software:
Provides engineers with relevant software tools to align antennas, check path links in both
directions, remotely adjust the RF power at each end and log the RSSI levels.
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1.24.3
Service Software
Service software is available to enable competent engineers to perform first line testing of the
product and re-alignment when used in conjunction with suitable test equipment.
1.24.4
Network Management Software
Network Management software has been designed to enable system operation and
performance to be monitored.
1.25
COMPATIBILITY WITH OTHER PRODUCTS
The ART series is backward compatible with the Communique CMD400 products,
any slight differences are outlined in Section 7.
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SPECIFICATIONS
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2.1
TECHNICAL SPECIFICATIONS:
2.1.1
GENERAL
Frequency Range:
ART400TR
406 - 512MHz
Alignment Range:
25Mhz
Programmable
Bandwidth:
12MHz
Minimum Programmable
Channel Step:
6.25KHz or 5KHz
TX/RX Channel Spacing:
Any within the programmable band.
Number of Channels:
80 sequential or 32 discrete user
programmable channels, field selectable via
two BCD switches, or by remote
Channel Spacing:
12.5KHz (optional 20/25/30KHz)
Mode of Operation:
Single frequency simplex
Two frequency simplex (semi-duplex),
Full duplex, as standard.
Store and Forward and Repeater modes
available to custom order.
Power Requirements:
9.6V - 15VDC (Negative Ground)
12VDC, 24VDC & 50VDC (Negative or
positive Ground) available via a DIN power
converter
Fuse:
Internal 3A Fast Blow
Reverse Polarity
Protection:
Series Diode
Operating Temperature:
-25 Deg C to +60 Deg C.
Humidity:
0 - 95% Non-Condensing
Frequency Stability:
<2.0ppm -20deg C to +60deg.C
Construction:
Milled Aluminium enclosure
Size:
156mm W x 125 H x 45mm D
Weight:
800gms
Connectors:
Serial Interface
9W “D” Female
Antenna
BNC
Audio/Landline
4Way pluggable terminal block
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DC Power
2Way pluggable terminal block
I.O. Connector
8way pluggable terminal block
LED indicators:
Switches
2.1.2
RX
TX
SYS
RTS
CTS
DCD
RXD
TXD
RI
DSR
DTR
RF Carrier Detect/Busy
Transmit
System
Request to Send
Clear to Send
Data Carrier Detect
Receive Data
Transmit Data
Ring Indication
Data Set Ready
Data Terminal Ready
2 x 0-9 for channel change
TRANSMITTER:
R.F. Output Power:
ART 1Watt 10mW - 1Watt PC
programmable
ART 5Watt 50mW - 5Watts PC
programmable
Output Impedance:
50 ohms
Duty Cycle:
50% without additional heat sinking
Time Out Timer:
Programmable 0 - 255 Seconds
Modulation:
Internal via Modem; FFSK, GMSK & 4
level FSK.
External, +3dBm to -20dBm into 600 ohm,
Programmable Pre-emphasised or Flat
response.
TX Keying:
Connection to Ground TTL compatible
The modem can be programmed to key on
detection of valid V23 or Bell 202 tones
instead of using a conventional TX enable
line.
Deviation:
7.5KHz Max. (Subject to channel spacing)
Adj. Channel Power:
Better than 65dB (12..5KHz)
Hum and Noise:
Better than 40dB
Spurious Emissions:
< 0.25uW (4nW within specified bands)
Rise Time:
< 5mS
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2.1.3
RECEIVER:
Sensitivity:
Better than 0.25µV (-120dBm) for 12dB
SINAD (de-emphasised response)
Spurious Response:
>80dB
Blocking:
>90dB relative to 1µV
Intermodulation:
>70dB with 9600bps data
Adjacent Channel:
>65dB at 12.5KHz
IF Frequencies:
VHF & UHF 45MHz and 455KHz
900MHz
70MHz and 455KHz
Spurious Emissions:
<2nW
External Audio Output:
+3dBm to -20dBm into 600 ohms with
Programmable De-emphasised or Flat
response and mute enable.
Mute Response Time:
<3msec
Received Signal Strength
(RSSI):
Range -120dBm to -40dBm
2.1.4
INTERNAL MODEM
Serial Comms:
Asynchronous or Synchronous with custom software.
Baud rate programmable between 150bps and 38400bps
Interface:
Selectable RS232 or 5V TTL plus inverted/non-inverted,
Parity:
Programmable odd, Even or None
Stop bits:
Programmable 1 or 2
Data Bits:
Programmable 7 or 8
Synchronous/Async.
Programmable either up to 1200bps, above 1200bps synchronous
Signalling Formats:
Programmable V23, Bell202, up to 1200 baud, 2400 baud FFSK,
4800 baud GMSK, 9600 baud 4 level FSK.
Baud date:
150 – 9600bps within 12.5KHz
Bit Error Rate:
150 - 2400 baud, less than 1 x 10-3 at –120dBm
4800 baud,
less than 1 x 10-3 at –117dBm
9600 baud,
less than 1 x 10-3 at –112dBm
2.1.5
BIT ERROR RATE BER
The Bit error rate quoted in the specification is for fixed messages with no Forward Error Correction
(FEC) and represents that which will be obtained from typical data sent over the link. The BER should
not be compared with other manufactures figures unless the data format is known, as many
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manufacturers quote a BER based on an alternating data pattern, which will obviously give much
better BER results.
In the interest of improvement the above specifications are subject to change without notice.
2.2
APPROVALS AND LICENSING
The ART Series meets relevant world wide standards as outlined below, should others be
required, please contact the sales office.:
2.2.1
UK Approvals
MPT1329:
For UHF telemetry applications, under this specification the RF output power
is limited to 500mW ERP.
MPT1328:
For VHF product with the power limited to 10mW.
MPT1411:
The unit is approved for use under MPT1411 where a licence is required and
the output power is normally stated on the licence, the maximum power
output of the ART is approximately 5Watts.
BS2011:
The unit complies with the Vibration specification BS2011.
2.2.2
European Approvals
ETS300-220
The unit is approved for European licensed exempt communications with a
maximum RF power level of 500mW. Please note the permitted power level
may vary from country to country.
ETS300-113
The unit meets the Licensed specification for data radios
ETS300-339: The unit meets the required CE specification and carries a CE Mark.
2.2.3
Other Approvals
At the time of writing this document the product range is currently
undergoing approval to the following specifications.
U.S.A
FCC Part 90 & 15
Canadian
RSS-122/119
Australian
AS 4268.2-1995
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2.3
OPERATING CHANNELS
2.3.1 UK TELEMETRY CHANNELS IN SETUP PROGRAM
From the PC Setup program the ART400 can be programmed with either all MPT1411 or
MPT1329 channels. A mixture of both channels can be entered discretely from the PC
program.
MPT1411 Channels
CHANNEL
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
SCANNER
457.50625
457.51875
457.53125
457.54375
457.55625
457.56875
457.58125
457.59375
457.60625
457.61875
457.63125
457.64375
457.65625
457.66875
457.68125
457.69375
457.70625
457.71875
457.73125
457.74375
457.75625
457.76875
457.78125
457.79375
457.80625
457.81875
457.83125
457.84375
457.85625
457.86875
457.88125
457.89375
457.90625
457.91875
457.93125
457.94375
457.95625
457.96875
457.98125
457.99375
458.00625
OUTSTATIONS
463.00625
463.01875
463.03125
463.04375
463.05625
463.06875
463.08125
463.09375
463.10625
463.11875
463.13125
463.14375
463.15625
463.16875
463.18125
463.19375
463.20625
463.21875
463.23125
463.24375
463.25625
463.26875
463.28125
463.29375
463.30625
463.31875
463.33125
463.34375
463.35625
463.36875
463.38125
463.39375
463.40625
463.41875
463.43125
463.44375
463.45625
463.46875
463.48125
463.49375
463.50625
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42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
458.01875
458.03125
458.04375
458.05625
458.06875
458.08125
458.09375
458.10625
458.11875
458.13125
458.14375
458.15625
458.16875
458.18125
458.19375
458.20625
458.21875
458.23125
458.24375
458.25625
458.26875
458.28125
458.29375
458.30625
458.31875
458.33125
458.34375
458.35625
458.36875
458.38125
458.39375
458.40625
458.41875
458.43125
458.44375
458.45625
458.46875
458.48125
458.49375
463.51875
463.53125
463.54375
463.55625
463.56875
463.58125
463.59375
463.60625
463.61875
463.63125
463.64375
463.65625
463.66875
463.68125
463.69375
463.70625
463.71875
463.73125
463.74375
463.75625
463.76875
463.78125
463.79375
463.80625
463.81875
463.83125
463.84375
463.85625
463.86875
463.88125
463.89375
463.90625
463.91875
463.93125
463.94375
463.95625
463.96875
463.98125
463.99375
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2.3.3
MPT1329 Channels:
If all MPT1329 channels are programmed via the PC software , access to channels 26, 27 & 32
will be denied, in line with MPT1329 band plan.
CHANNEL
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
FREQUENCY
458.5000 Guard Ch.
458.5125
458.5250
458.5375
458.5500
458.5625
458.5750
458.5875
458.6000
458.6125
458.6250
458.6375
458.6500
458.6625
458.6750
458.6875
458.7000
458.7125
458.7250
458.7375
458.7500
458.7625
458.7750
458.7875
458.8000
458.8125
458.8250 Not Used
458.8375 Not Used
458.8500
458.8625
458.8750
458.8875
459.0000 Not Used
459.0125
459.0250
459.0375
459.5000 Guard Ch.
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2.4
OPTIONS & ACCESSORIES:
2.4.1
DIN UNINTERRUPTABLE POWER SUPPLIES WITH CHARGERS
ART75080- 250VAC to 12VDC 3 Amps with backup battery charger & fault
reporting via the I2C Bus
ART75180 – 60VDC isolated to 12VDC 3 Amps with backup battery
charging and fault reporting via the I2C bus
2.4.2
DIN MOUNTABLE RF POWER AMPLIFIERS
ART400PA-25 UHF 5Watt to 25Watt RF power amplifier with built-in VSWR facility that
measures Forward & Reflected power and conveys the information back to
the ART400 via the I2C bus.
ART170PA-25 VHF 5Watt to 25Watt RF power amplifier as the ART400PA-25
2.4.3
DIN I.O. MODULES
ART7108 Digital I.O.
ART7204 12bit Analogue Outputs Current
ART7214 12bit Analogue Outputs Voltage
ART7304 12bit Analogue Inputs Current or Voltage
ART740
4 Digital I.O. 2 12bit Analogue Inputs, 2 12bit Analogue Outputs
ART780I2C Protocol converter to Modbus, Canbus, Device-net etc.
ART781
2 x RS232/485 to I2C Bus converter
ART782GPS module
ART790Duplicated controller
2.4.4
LEADS & CABLES
RS232 cable 9 Way "D" to 9Way “D”
Store and Forward Connecting Lead between to radios
“N” to BNC Coax Cable Adapter for Chassis Mounting
2.4.5
RF ADAPTERS & PARTS
External In-Line VSWR Detector
External Solid State Antenna Switch
Lightning Arrester with “N” Connectors
Lightening Arrester with “BNC” Connectors
2.4.6
ENCLOSURES
19 inch rack to take an ART400 and power supply
Lockable IP51 wall cabinet to take an ART400, power supply and
backup battery.
IP67/68 Enclosures available to take most modules
2.4.7
MANUALS
Programming, installation and operations manual
2.4.8
BACKUP BATTERY PACKS
Full range in stock to fit the above enclosures.
2.4.9
ANTENNAS
We stock a full range of antennas for most applications. For a full list please contact the sales
office.
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OPERATION & INTERFACE
3.1
EXPLODED VIEW
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The exploded view shows the main components of the radio modem; the milled enclosure,
MPU control & interface board, transmitter module, receiver module and LED board.
The view also shows the internal links JP1, JP5, JP11 & JP12 that are set during production.
Normally once the equipment is deployed, these links would never be changed.
3.2
OPERATION AND INTERFACE DESCRIPTION
3.2.1
SIMPLEX, SEMI-DUPLEX & FULL DUPLEX
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The ART product can be operated in single frequency simplex, two frequency simplex (semiduplex) or full duplex, provided the channels are within the bandwidth of the product.
This is particularly useful when using the unit in the UK, as MPT1411 (two frequency
simplex/duplex) and MPT1329 (single frequency simplex) channels can be programmed and
used together.
3.2.2
SINGLE OR DUAL ANTENNA OPERATION
The ART product is normally ordered for Simplex single antenna or Simplex/Duplex
dual antenna operation However with the correct parts the conversion from one to the other
takes only a few minutes.
3.2.3
COAX CONFIGURATIONS
For two antenna operation individual coaxes from the receiver and the transmitter module
connect to separate BNC connectors on the chassis. In single antenna operation the
receiver ‘s internal antenna connector is connected to the RX port on the transmitter module
and a blanking cap is fitted where the RX BNC would normally be fitted. The RX port on the
transmitter is a pin diode switched output with isolation to stop excessive RF power being
fed into the receiver during transmit. Fitting of link JP1 sets a hard wired control line that
switches off the receiver’s front end during transmission for additional protection.
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JP1
Link 1-2 for 2 antenna operation
Link 2-3 for single antenna operation
3.3
REPEATER/STORE & FORWARD OPERATION
To achieve greater distances the ART product can be used in a “repeater” or “store &
forward” mode. However, the success of this mode of operation may depend on the system’s
protocol, further details are in section 5.
3.3.1
REPEATER
A full repeater will require two ART’s coupled together via a cable, one is used to
communicate with one side of the link and the other to the distant outstation or outstations.
A signal received by either receiver will trigger the transmitter in the opposite unit and data
will be passed on. If the protocol is known, it is possible to store addresses in the products
memory and only pass on messages when there is match. However, this will require special
software.
3.3.2
STORE & FORWARD
3.3.2.1
Single Unit Operation
For single frequency operation incoming messages are stored and then re-transmitted.
Depending on the application & software, all or some of the messages may be forwarded.
If the outgoing message channel is different from the incoming message channel, it is
possible to receive the signal and store it, change frequency and re-transmit it. The unit will
then wait for a reply on the new channel and store it, change to the other channel and return
the reply.
It is obvious that there can be various timing problems with this set-up and as the radio
modem has a default state, all calls should be initiated from one direction.
If different inbound to outbound channels are to be used, we strongly recommend that two
ART’s are used back to back as outlined below.
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3.3.2.2
Two Unit Operation
A better solution than using one product is the use of two units connected together via a
cable. When one unit receives the incoming signal, it buffers the message, turns on the other
unit’s transmitter and commences the transmission. The same applies in the opposite
direction. There will be a time delay with this set-up, as the receiver has to detect the carrier
and then turn on the other unit's transmitter. The advantages are; the receivers in both
directions are always active and so either direction may initiate a call, and different antennas
for each radio can be used to suite the application and provide additional isolation.
3.4
MEMORY EXPANSION & PROGRAMMING PORT
JP5 is the memory expansion and processor programming port. This port is used during
production to download the firmware into the processor’s flash memory. Once programmed
the 3 jumpers are installed linking 1-2, 3-4 & 5-6 for normal operation.
Should the memory expansion card be required, the links are removed and the card is
plugged in their place.
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3.5
VIEW SHOWING MEMORY EXPANSION BOARD
3.6
EXPANSION MEMORY CARD
The expansion memory card contains FLASH ROM, RAM and a control PIC processor,
it can be used for three different functions as outlined below:
3.6.1
Firmware download tool
During production or firmware changes, the card can be loaded with the required firmware
and plugged into the port to transfer the new firmware upgrades or changes.
3.6.2
Additional memory
The processor has 128K of memory from which it executes its program which is plenty for
most applications. If insufficient memory is available the card can provide additional
memory of up to 512k, programs can then be downloaded and interchanged as required.
3.6.3
Remote firmware download module
The programmable parameters of the radio are stored in EEPROM and can be changed via
the serial port or over the air. However, should new firmware be required it normally
involves changing out OTP’s or memory devices. The Flash memory device in the ART
allows upgrades or changes to be easily achieved, simply by over writing the memory.
Unfortunately the processor cannot over write its own flash memory while still being in
operation so the memory board is used to store new firmware and under the control of an on
board PIC processor will down load the new code safely to the main flash processor.
Upgrades can take place over the serial port or over the radio link which is a very desirable
feature for large networks, as all changes can take place from the base controller, with out site
visits.
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3.7
SERIAL AND RS232 INTERFACE
JP11
Leave open or link 2-3 for inverted signal (normal)
Link 1-2 for non-inverted
The ART400 serial port is used to program and control the modem/transceiver. The comms
port is selectable to provide full RS232 or 5V TTL signal levels, either mode can be run true or
inverted, these modes are selected by links on the processor pcb, which are normally
specified by the client and configured prior to despatch. Should these parameters need to be
changed in the field, the following can be used as a guide.
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JP12
For RS232 serial without DTR Shutdown link 2-3
For RS232 serial with DTR Shutdown link 1-2
For 5V TTL serial link 4-5
Note: the –5V generator for the RS232 interface is turned off if 5VTTL is selected, and also
while DTR is inactive if the DTR shutdown link option is enabled. The latter option is
complemented by the software DTR shutdown option which causes the processor to shut
down all the radio circuits while DTR is inactive. For lowest current consumption both
options must be enabled.
3.8
SERIAL PORT PIN CONNECTIONS
The ART400 is equipped with a 9 way D connector for all serial port connections, the pins of
this connector are allocated as follows:
Pin No.
Description
1.
2.
3.
4.
5.
6.
7.
8.
9.
DCD: Data Carrier Detect
RXD: Receive Data
TXD: Transmit Data
DTR: Data Terminal Ready
GND: GROUND
DSR: Data set ready
RTS: Request to send
CTS: Clear to send
RI: Ring Indicate
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3.9
ANNTENA CONNECTIONS
Antenna connection is made via one or two BNC connectors, the radios can be supplied with
either two connectors for simplex/full duplex two antenna operation or with a single
connector for simplex/semi-duplex single antenna operation. Note that a link has to be set on
the processor PCB inside the radio to protect the receiver front end in single antenna
operation.
3.10
12VDC POWER
Power (Nominal 12VDC) is supplied to the unit through the 2 way pluggable terminal block
connector, polarity is marked on the front panel.
3.11
I2C BUS INTERFACE
An RJ45 connector provides an I2C interface to the radio to allow connection of I/O modules,
please refer to the sales office for details of these other products.
Pin No.
1&2
3&4
9 & 10
Description
Nominal 12VDC direct feed via a fuse & Over voltage Protection
N/C
SDA I2C Data Line
SCK I2C Clock Line
I.O. Reset
I.O. Interrupt
Ground
3.12
AUDIO & LINE INTERFACE
A 4 way pluggable terminal block is provided for the connection of external audio signals,
these are connected to 600 ohm isolating transformers inside the unit. The connection details
are marked on the front panel of the radio.
Pin No.
1&2
3&4
3.13
Description
Balanced 600 ohm audio output
Balanced 600 ohm audio input
SWITCHES
The two front panel BCD switches select channels, or if both are set to zero program mode is
entered.
When viewing the ART400 with the aerial connector(s) at the top the left hand rotary switch
is the "tens" switch and the right is the "units" switch, thus to set channel 37 set the left switch
to 3 and the right to 7.
3.14
CONTROL INTERFACE
An 8 way control interface is a pluggable terminal block that provides the remaining signal
connections, these are the uncalibrated RSSI voltage output, drives for external transmit and
carrier detect LEDs, two digital inputs and two digital outputs. One of the digital inputs (DI0)
is used for keying the transmitter when it is programmed for external audio operation with
the TOX (tone operated switch) turned off. The individual connections are marked on the
front panel.
Pin No.
Description
Ground
RSSI
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The RSSI signal is represented by a voltage from 0-5VDC
TX LED
The anode of a transmit LED may be connected to this pin and its
cathode should be connected to ground, the LED supply current
will be approximately 3mA so a low current LED should be used.
The LED will illuminate whenever the CMD400 enters transmit
mode.
BUSY LED
The RX LED connects in the same way as the TX LED above and
provides an indication of carrier detect.
DI0/TXe
Digital input 0 (0 – 30VDC) or TX enable in Audio mode
DI1
Digital input 1 (0 - 30VDC)
DO0
Digital output 0, open collector
DO1
Digital output 1, open collector
3.15
EXTERNAL AUDIO PATH
The selection of internal modem or external audio operation is made at the time of
programming the ART. If programmed for external audio the external modulation input and
output will provide an adjustable range of +3dBm to -20dBm into 600 ohms, this adjustment
is made by electronic potentiometers under the control of the set up program. The external
RX audio is optionally muted in the absence of a carrier. The external audio input and output
is via isolating transformers and so will couple directly to almost any 600 ohm interface.
In the external audio mode there are two options for keying the transmitter; first using digital
input 0 (marked DI0/XPTT on the front panel), or secondly by using the tone operated
switch (TOX). The TOX can be programmed to key on either V23 mode 2 or Bell 202 tones.
Other tonesets can be provided for, by special order.
It should be noted that the external audio path is AC coupled and so is not suitable for GMSK
or multi-level signalling at baud rates above 2400 baud.
3.16
INTERNAL MODEM
The internal modem can operate at speeds between 150 and 9600 baud, at speeds up to 1200
baud FFSK signalling is used with either Bell 202 or V23 mode 2 tone sets. 2400 baud uses a
1200/2400 Hz coherent FFSK tone set, 4800 baud uses GMSK, and 9600 baud uses four level
FSK. All of these tone sets with the exception of 9600 baud are compatible with the
Communique CMD400 radio, in addition the V23 tone set is compatible with many older
systems from other manufacturers.
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The serial interface can be programmed either to use RTS/CTS handshaking to initiate
transmission, or to transmit whenever data is present at the serial input. In the latter mode
CTS is still operated to implement flow control but can be ignored unless message sizes
exceed 1k byte and the serial port baud rate is higher than the radio signal baud rate. These
handshaking modes are compatible with the old Communique CMD400 modes A, C and D.
Mode B (byte stuffing mode) is not supported.
3.16.1
TRANSMISSION USING RTS/CTS HANDSHAKING
If handshaking is enabled transmission is started by operating RTS, CTS can then be
monitored for flow control purposes. In the idle state CTS is inactive, when RTS is operated
CTS will become active immediately and data may be input to the serial port, when all data
has been loaded to the serial port RTS should be dropped, transmission will continue until all
data in the serial input buffer has been sent, then CTS will become inactive and transmission
will cease. During transmission the amount of data in the serial buffer is checked by the
radio, if the buffer becomes ¾ full CTS is dropped to request the host to stop loading data,
CTS is activated again when the buffer is reduced to ¼ full. To prevent timing problems data
will still be accepted into the buffer when CTS is de-activated due to buffer filling during
transmit, however any data received once CTS has dropped at the end of a transmission will
be discarded, this prevents such data from being prefixed to the beginning of the next
message.
3.16.2
TRANSMISSION WITHOUT HARDWARE HANDSHAKE
If RTS/CTS handshaking is disabled the radio will start transmission as soon as data is
received at the serial port, transmission ceases as soon as the serial buffer has been emptied
and a period equivalent to two characters at the radio signal baud rate has elapsed. It is
important to note that since transmission ceases as soon as a two character delay in the
incoming data stream is seen, data characters in a message must be presented in a continuous
back to back stream.
In this mode CTS is still used to indicate the serial buffer fill level in the same way as
described in the section on transmission using handshake, the difference is that in the idle
state CTS is always active indicating readiness to accept data. In most applications CTS can
be ignored as messages are likely to be smaller than the serial input buffer (1k byte), bear in
mind also that if the radio baud rate and data format is the same as that configured for the
serial port the buffer is being emptied as fast as it is being filled and so buffer overrun is
unlikely.
3.16.3
DATA RECEPTION
Any data received by the radio is simply output to the serial port, the DCD line can be
programmed to operate in three different modes to assist the host. Firstly by indicating that a
carrier is detected on the radio channel, this is useful if a busy lockout function is required
(although this can be dangerous if the channel is susceptible to interference as well as wanted
signals), secondly DCD can indicate presence of a carrier and a valid data signal, data will
normally be output under this circumstance, the third mode behaves in the same way as the
second except that DCD remains active until all data has been output to the serial port after
the signal has gone, this allows DCD to be used as a wake up signal.
3.16.4
TRANSMIT & RECEIVE TIMING
The ART is able to operate in full duplex, semi-duplex and simplex modes. In full duplex
mode the radio can transmit and receive data at the same time, in order to do this the
transmit and receive frequencies must be spaced sufficiently far apart to prevent the
transmitted signal interfering with received signal.
Semi-duplex mode is similar in that two well spaced frequencies are used but data is only
sent in one direction at a time, radios that do not have separate synthesisers for transmit and
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receive cannot operate in full duplex mode, they can operate in half duplex mode but must
reload their synthesiser when changing direction, the ART does not have this limitation as it
is equipped with two synthesisers.
In simplex mode the same channel is used for transmit and receive, the radio synthesiser
must be reloaded whether one or two synthesisers are fitted. Radios with one synthesiser
must reload to account for the I.F. offset used by the receiver, radios with two synthesisers
must reload to prevent leakage from the transmitter blocking the receiver.
The time taken to switch from receive to transmit and vice versa is the same on the ART for
full duplex and half duplex modes, in fact the radio does not differentiate between them. In
simplex mode this time is increased because of the synthesiser reload and lock times.
In order to reduce adjacent channel interference in line with ETS300-113, the power output
from the transmitter has finite rise and fall times, a distant receiving radio will therefore see
an incoming signal later than a nearby one. The receiving radio also requires time for the
carrier detect circuit to operate and for the modem to lock on to the incoming audio signal.
If running in full duplex mode these are the only timing considerations required and can be
catered for using the programmable “lead in delay”, the major part of the time is required for
the modem to lock on to the incoming data stream and this is dependant on the radio signal
baud rate. Minimum timings are given below:
Baud Rate
Lead in Delay
150
300
600
1200
2400
4800
9600
80ms
60ms
40ms
40ms
40ms
20ms
20ms
For a two frequency simplex (Semi-duplex) or a duplex channel, the TX & RX synthesisers
remain loaded and hence there is only the TX rise time to consider. If single frequency
operation is required additional time is required for the transmit synthesiser to be loaded and
locked prior to transmission and to be shifted away from the receive channel when
transmission ceases. This timing constraint is important when deciding how soon after
receiving a message a reply may be sent. For single frequency operation the ART is ready to
receive data approximately 25ms after transmission ceases. It is therefore necessary to either
wait this length of time after receiving a message before sending a reply or to extend the lead
in delay by the same amount to hold off transmission of the data.
For applications where power save is in use the lead in delay should be extended to allow the
receiving device to wake up. The time required can be calculated by adding the save on time
to the save off time and adding 10 percent, e.g. for a save on time setting of 800ms and a save
off time of 200ms the lead in delay should be 1100ms.
Care must be taken when replying to a previously transmitting ART when RTS/CTS
handshake is not being used, in this mode the transmitting device will wait for two character
times before turning off its carrier and may therefore miss the beginning of a reply if it comes
too soon, this may be overcome either by imposing an additional two character delay in the
controlling device or by extending the lead in delay by that amount.
The ART also has a facility for imposing a lead out delay, this is the time that the carrier
remains on after transmission of the message is complete, this delay can normally be left at
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zero, it is only of use where a controller makes use of the DCD signal to suppress data
processing but suffers some delay in processing received data.
3.16.4.1
RECEIVE TO TRANSMIT SWITCHING TIME
When using the internal modem the action that initiates transmission can be either receipt of
a character at the serial port or the operation of RTS. These examples use the first mode. The
radio does nothing until the stop bit of the first character for transmission has been received,
the transmitter is then started:
The time delay between receipt of the stop bit for the first character to be transmitted at the
transmitting radio and output of the start bit of that character at the receiving radio is the
sum of the values ttxon, tlid, trbyte, and tmdel shown in the diagram above. Values for these
parameters are indicated below:
TABLE A: Timing values for duplex and simplex modes are as follows:
symbol
ttxon
tlid
trbyte
tmdel
description
Time from external action to commencing transmission
Duration of synchronisation transmission (lead in delay)
Duration of 1 byte at radio signal baud rate
Modem decode latency
duplex
1.3ms
Table B
Table C
Table D
simplex
9ms
Table B
Table C
Table D
TABLE B: The lead in delay is a programmable parameter but minimum values dependant
on baud rate must be adhered to. However, in a scanning system with the base station on
continuos transmit the base station lead in delay can be set for Zero (thereby saving valuable
time) as the internal outstation modems will always be synchronised.
Baud
Min tlid
150
80ms
300
60ms
600
40ms
1200
40ms
2400
40ms
4800
20ms
9600
20ms
TABLE C: The duration of a byte at the radio baud rate is dependant upon the data format
employed, the table below assumes a format of one start bit, 8 data bits, no parity and 1 stop
bit, i.e. a total of 10 bits per character. If another format is used the appropriate correction
must be made.
Baud
trbyte
150
66.7ms
300
33.3ms
600
16.7ms
1200
8.3ms
2400
4.17ms
4800
2.08ms
9600
1.04ms
TABLE D: The modem decode latency takes into account delays introduced by hardware and
software filters. The total delay is baud rate dependant:
Baud
tmdel
150
6.9ms
300
3.5ms
600
1.7ms
1200
1.3ms
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2400
1ms
4800
1ms
9600
1ms
3.16.4.2 MESSAGE DURATION
The time taken to transmit a message can be simply derived by multiplying the number of
characters in a message by the values given in table C making any appropriate corrections for
data format. The exception is 9600 baud where extra synchronisation sent during the message
must be taken into account, 8 synchronisation bits lasting a total of 8.3ms are sent after every
eighth message character.
3.16.4.3 TRANSMIT TO RECEIVE SWITCHING TIME
In full or semi-duplex operation transmit to receive switching time does not need to be
considered as the receive path is maintained during a transmission, in simplex operation
some time must be allowed to reload the transmitter synthesiser to stop it from interfering
with the receiver. The diagram below indicates the minimum time in which the radio is able
to receive a signal after completing a transmission.
symbol
thold
trxrdy
description
Period for which carrier is held up after sending last data byte
Time to reload transmit synthesiser in simplex mode
value
2.5ms + LOD
6ms
During the time thold the radio transmits some padding bits to allow for propagation delays
in the receiving device before shutting off the carrier, this prevents possible chopping of the
message tail. The time thold is composed of a fixed 2.5ms period plus the programmable
value LOD (lead out delay). LOD is normally set to zero. After the time trxrdy has expired
the radio is ready to receive a new signal.
N.B. If RTS/CTS handshaking is not used the transmitter is turned on whenever data is
received at the serial port, the transmitter is left on until all buffered data has been
transmitted and no data has been input for a time equivalent to the length of two characters
at the radio baud rate (refer to table C). In general data transmitted by the radio is delayed
with respect to its receipt at the serial port by the receive to transmit switching time, if the
radio baud rate and serial port baud rate and both data formats are the same this delay
remains constant throughout the transmission. At the higher baud rates this delay is
generally greater than the lengthof two characters and so the procedure to stop transmission
is started as soon as the last character has been sent, at the lower baud rates however it is
possible that the time thold is extended while the radio waits for the two character timeout to
expire, this can also happen if data characters are not loaded back to back into the serial port.
3.16.5
RADIO DATA FORMATS
The radio signal can be set up to operate using 7 or 8 bit data, 1 or 2 stop bits, and odd, even
or no parity. This setting is independent of the serial port setup. This allows compatibility
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with other radios. The Communique CMD400 does not set these parameters independently,
with one exception the radio signal format in this radio is set to be the same as that of the
serial port even though the baud rates can be different. The exception is mode C where the
radio signal format did not include parity, if compatibility with this radio is required parity
must be disabled in the radio signal regardless of the serial port configuration. Later versions
of the CMD400 had an additional mode entitled “mode C plus parity” in which parity was
included, use of this mode did not give rise to the exception.
3.16.6
SYNCHRONOUS/ASYNCHRONOUS FORMAT
The radio signal format can be programmed for asynchronous or synchronous operation at
baud rates up to 1200. At baud rates of 2400 or more operation may only be synchronous.
In synchronous mode inverted NRZI encoding is used where a one is represented by a
transition in the binary data, every transmitted bit fits into a time slot defined by the baud
rate, this allows a phase locked loop to lock on to the data stream to give better performance
in noisy conditions, the inverted NRZI encoding allows this to continue even when the signal
is idling sending stop bits. The inverted NRZI encoding gives a further advantage with
GMSK signalling since the polarity of the signal is unimportant.
In asynchronous mode NRZ encoding is used where a “one” tone represents a binary one,
and a “zero” tone a binary zero, whilst each character consists of bits of equal duration
defined by the baud rate, the time between the end of a stop bit and a following start bit may
be arbitrary. This prevents the implementation of a phase locked loop to improve signal to
noise performance but does allow use within older systems that do not implement
synchronous transmission or NRZI encoding.
3.17
ERROR REPORTS
The modem reports errors in two ways, firstly the BUSY led will come on and the SYS led
will flash a number of times, the BUSY led will then go out again and if the fault persists the
procedure will be repeated. An error number can be determined by counting the number of
times the SYS led flashes while the BUSY led is on. Alternatively the error can be read by
monitoring the serial port using a PC comms program running at 9600 baud, 8 data bits, 1
stop bit and no parity. An "E" is output followed by the error number. Error numbers for both
modes are as follows;
ERROR No
FAULT
The position of the channel switches has changed.
A channel has been loaded that has no RX frequency
programmed.
Transmission has been attempted on a channel that has
no TX frequency programmed.
The receiver synthesiser phase locked loop has failed to
lock due to bad channel data or programming of an out
range frequency.
The transmitter synthesiser phase locked loop has failed to
lock due to bad channel data or programming of an out
range frequency.
The contents of the microprocessor's EEPROM are
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corrupted (failed checksum) in the general program area.
3.18
Internal comms with a high power amplifier have failed.
The contents of the microprocessor's EEPROM are
corrupted (failed checksum) in the calibration area.
The contents of the microprocessor's EEPROM are
corrupted (failed checksum) in the factory program area.
12
The programmed R.F. power setting is out of range.
TIME-OUT-TIMER
The time-out timer allows the maximum continuous transmission time to be set in order to
prevent channel blocking due to a host fault. The timer works in all modes (external/internal
modem) and is programmable in one second steps between 0 and 255 seconds. In all cases
transmission will cease until the action that normally causes transmission is removed and
then re-applied. More explicitly; in external modem mode the transmit enable line (DI0) must
be released and then lowered again, in internal modem modes with RTC/CTS handshake
enabled RTS must be dropped and then raised again, or if handshake is not enabled character
transmission must be suspended for at least two character periods at the serial port baud rate.
In all modes the modem’s SYS led is flashed at least twice when time-out occurs, the flashing
continues while lockout is in force. The lockout timer is disabled if the lockout time is set to
0. The lockout timer can be operated in “resettable” or “cumulative” mode, in resettable
mode the timer restarts each time a transmission is made, in cumulative mode the timer
counts up during transmit, and down during receive. If the timer counts up to the lockout
time during transmit lockout occurs, this will eventually happen if the radio spends more
than half of its time transmitting. Lockout in this mode is indefinite and can only be reset by
powering the radio off.
3.19
POWER SAVE MODE:
The ART is equipped with an internal and external power save mode. These are outlined
below:
1. The internal power save facility: In this mode the microprocessor switches the transceiver
off and after a pre-programmed time (Save on time) switches the unit back on (Save off time).
If a carrier is not detected then the transceiver again switches off. If during the time the
transceiver is awake a carrier is received, the unit will stay on. After the carrier drops out the
receiver will stay on until the programmed resume time elapses. Once the resume time has
elapsed the unit will return to its power save mode. The Save On/Off and Resume time are
all programmable via the PC program. Obviously the amount of power saved increases with
the programmed save on/off ratio, however with power save enabled long lead times must
be programmed to wake up the unit before communication can take place. Therefore it may
not be possible to run all applications under the power save mode due to the turn around
times required by the host system. In some circumstances it is possible to achieve power save
and fast polling: If polling of all outstations is carried out in cycles with a reasonable gap
between each cycle, a long initial poll can be used to wake up all stations, the resume timer
will then restart each time an outstation is polled allowing fast access, when the cycle is
complete all stations will return to power save after the resume time has expired.
2. The External power save mode: Under this mode the on/off ratio is controlled externally
via the DTR line (DTR shut down must first be enabled using the set up program). In this
mode more of the modem's circuits are shutdown (including the microprocessor), this saves
more power but care must be taken to ensure that the modem is enabled when a transmission
is to take place. Note that there is a hardware link option to allow the serial port to shut off
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when DTR is not active, this allows the radio current to be reduced to its bare minimum. In
applications where DTR is not connected this link option must of course be disabled.
3.20
RSSI OUTPUT
The RSSI (received signal strength indicator) output available at the I/O connector provides
an aid in antenna installation, the DC output level from this pin varies in proportion to the
strength of the received radio signal. Because of unit to unit variations the output is not
calibrated to allow absolute measurements to be made, this can however be done by the user
with the aid of suitable test equipment.
3.21
TEMPERATURE MEASUREMENT
3.22
INPUT VOLTAGE MEASUREMENT
3.23
REAL TIME CLOCK
3.24
EXTERNAL I.O
Within the ART is a thermistor which in turn is connected to an A-D on the processor.
This is used to measure the internal temperature of the module and to compensate for
temperature changes. The temperature in deg.C/F is available via a connected PC or over the
radio link via management software.
The input supply to the ART is monitored via an A-D on the processor and the actual voltage
can in be read from a connected PC or over the radio link via management software.
The ART product has an on-board real time clock and although it is not used in the current
configuration it can be used for specific timed wake up calls etc. in custom applications.
The ART is equipped with two digital inputs and two digital outputs that can be used via the
management software.
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INSTALLATION
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4.1
INTRODUCTION
The ART Series are DIN rail mountable Radio Modems/Repeater for outstation applications,
although with the upgraded internal heat sink they could be used as base station/scanners,
providing the transmit duty cycle is less than 75%.
Correct installation should ensure reliable data communications for many years.
The most important installation points to remember are:
Suitable antenna system mounted at the correct height & polarisation to achieve the required
distance.
Reliable power supply capable of supplying the correct voltage and current.
Correct installation for the environment
Correct interface and set-up
Assuming the unit has been correctly installed and tested at the correct data speed, the only
other factors that will effect the performance, are the RF power, (Normally Specified by the
regulating authority), the local topography and the weather, none of which the user can
control.
4.2
POWER SUPPLIES
The ART series can be powered from any power source providing the voltage is between
9.6VDC & 15VDC –VE GND. If a +VE GND system is in use, an isolated converter will be
required.
The ART Series is available in either 10mW – 1Watt or 20mW – 5Watts, which requires a
supply current of 1Amp and 2.5Amps respectively.
Under no circumstances should the output of the supply rise above 16VDC.
For 240/110VAC, 50VDC or 24VDC, R.F. Technologies produce a range of uninterruptable
power supply units with an in-built charger and power fail indication. A range of suitable
Gel type batteries is available should a back-up supply be required during power fail.
ART DIN Power Supplies:
ART750
80- 250VAC to 12VDC 3 Amps with backup battery charger & fault
reporting via the I2C Bus
ART751
18 – 60VDC isolated to 12VDC 3 Amps with backup battery
charging and fault reporting via the I2C bus
4.3
EFFECTIVE RADIATED POWER (ERP)
The Radio Frequency (R.F.) Power allowed can be specified in two ways:
The “Terminated power into 50 ohms”, which in the case of the ART 5watt product would
be a maximum of 5Watts.
The “ERP” is the actual radiated power, taking into account the gain/loss of the antenna and
loss in the feeder. Hence, if we use an aerial with a Gain of 3dB (x2) and assume no loss in the
cable, the ERP with an input of 5watts would be 10Watts.
The gain of an antenna is very useful as it enables lower power transmitters to be used
in many cases in place of high power transmitters, with the advantage of a much lower
current consumption.
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For example if the ERP allowed for a link is 5Watts, then an ART 5Watt product operating
into a unity gain antenna, would require a supply current of 2Amps to provide an ERP of
5Watts.
If however, we use an 8 element directional Yagi with a Gain of 10dB, we would only need
500mW for the same performance.
With a 5Watt ART product operating at 500mW, we would only require 600mA.
Alternatively with a 1Watt ART Product operating at 500mW the current would drop to
350mA. If the site is battery or solar powered then the saving is very significant.
Care must be taken when setting the power within a MPT1329/1411 system, as RF power is
specified as maximum ERP.
4.4
SAFE DISTANCE CALCULATION
As safe distance calculation has been used to determine the safe distance a person should
be from the antenna with the power level set at 5Watts.
Gain of Antenna
Safe distance
Unity
0.5Mtrs
3dB
0.7Mtrs
6dB
1.0Mtrs
8dB
1.3Mtrs
10db
1.6Mtrs
12db
2.0Mtrs
4.5
ANTENNAS, COAX FEEDERS & PERIPHERALS
4.5.1
ANTENNAS
Apart from the radio modem, the antenna is probably the most important part of the system.
The wrong choice or a bad installation will almost certainly impede the product’s
performance. Depending on the application either an omni-directional or directional antenna
will be required.
4.5.2
TYPES OF ANTENNAS
We can offer a complete range of antennas to suit all applications, details of some of the more
popular ones are outlined below:
Antenna Types:
Vertical Whip
Helical
Typical Gain
0dB
-3dB
End Fed Dipole
Folded Dipole
0dB
0dB
Polarisation
Vertical
Vertical
Use
Local use.
In-house testing and
Vertical
Vertical/Horizontal
Local Scanner or Multi-point
system
Vertical
Vertical
Wide area Scanner
6dB Co-linear
3dB Co-linear
+6dB
+3dB
2 Element Yagi
4 Element Yagi
+12dB
+8dB
Vertical/Horizontal
Vertical/Horizontal
Corner Reflector
+10dB
Vertical/Horizontal
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Point link
Outstation or point to
Outstations in areas of bad
Interference or where
unwanted radiation must
be kept to minimum.
Patch Antenna
0dB
Vertical/Horizontal
Kiosk or wall mounting
4.5.3
DIRECTIONAL ANTENNAS
For point to point communications, a directional Yagi or corner reflector is probably the best
type of antenna to use. As directional antennas provide relatively high gain in the forward
direction within a limited beamwidth and very good rejection of unwanted signals at the
rear. The number of elements and hence the size, will depend on the gain and beam width
required. Yagi antennas can be used in the vertical (vertically polarised) or horizontal
(Horizontally polarised) but communicating products should be fitted with antennas of the
same orientation , if not a loss of signal strength will occur. Vertical and horizontal
propagation can be very useful on single or repeater sites where isolation is required between
communication paths. Using differently polarised antennas for each path will increase the
isolation which will reduce possible interference.
4.5.4
OMNI-DIRECTIONAL ANTENNAS
With approximately 360 degree radiation pattern, this type of antenna is ideal for a scanning
station or where communication to a group of widely dispersed outstations is required.
4.5.5
PATCH OR PLATE ANTENNAS
The patch or plate antennas are normally rectangular or round, with a back plate of
aluminium or stainless steel. A polycarbonate or ABS cover is fitted to protect the antenna
from the environment. This type of antenna can be produced in different sizes with various
radiation patterns to suit the application. Depending on the construction and radiation
pattern, the gain is usually between -3dB to + 3dB. Their use is very popular on road side
kiosks, buses, trains, aircraft, or where covert communication is required.
4.5.6
ANTENNA MOUNTING
Location:
The antenna should be mounted in a clear area, as far away as possible from obstructions
such as metal constructions, buildings and foliage.
Height:
The ART products operate in the VHF/UHF & 900MHz, which require normal line of sight
communication. Hence, for extended ranges the height of the antenna is important.
4.5.7
POLARISATION
A Yagi or corner reflector antenna can be mounted for vertical or horizontal polarisation.
Scanning systems employing a vertically polarised antenna, will necessitate the outstation
antennas to be of the same orientation. In vertical polarisation the elements are perpendicular
to the ground. By mixing polarisation within systems, unwanted signals can be reduced by as
much as 18dB. However, such systems require detailed planning.
4.5.8
ALIGNMENT
If a directional antenna is to be used, it will need alignment with the scanner or
communicating station. A map and compass can be used, but the final adjustment should be
performed by measuring the receive signal strength (RSSI) from the scanner, as outlined in
the operations section.
4.5.9
ANTENNA COAX FEEDER:
As with the antenna, the use of the wrong coax feeder can seriously affect the performance of
the system. Hence, the coax cable should be selected to give a low loss over the distance
required. For outstations in the local vicinity of the scanner/ base station, the loss is not very
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important but for distant stations the loss is very important. As a rule of thumb, never
operate a system with a loss of more than 3dB.
To illustrate the point, a 3dB loss in the feeder will result in a 50% loss in transmitted RF
power and a 50% reduction in the received signal strength. Therefore, double the received
signal strength will be required for the same bit error rate.
Although increasing the RF power will compensate for the loss in transmitted power,
there is no effective way to improve the received signal strength.
Coax cable should be installed in accordance with the manufacturers’ instructions, with
cable runs kept as short as possible. Sharp bends, kinks and cable strain must be avoided
at all costs. If long term reliability is required, the cable must be securely mounted to avoid
excessive movement and longitudinal strain, due to high winds, rain and snow.
4.5.10
SIGNAL LOSS VERSES CABLE LENGTH AT 500MHZ
Cable Type
Attenuation
Attenuation
per 100ft
per 100M
13.0dB
37.0dB
6.0dB
17.5dB
2.44dB
8.0dB
1.60dB
5.26dB
0.883dB
2.9dB
0.654dB
2.15dB
0.547dB
1.79dB
RG58
RG213
LDF2-50 3/8inch Foam Heliax
LDF4-50 1/2inch Foam Heliax
LDF5-50 7/8inch Foam Heliax
LDF6-50 1-1/4inch Foam Heliax
LDF7-50 1-5/8inch Foam Heliax
4.5.11
COAX, CONNECTORS:
50 Ohm coax connectors of a good quality should be used, termination must be in accordance
with the manufacturer's specification, any special tools required to terminate the connectors
must be used. Connectors exposed to the environment should be sealed to prevent the
ingress of moisture. If the cable is penetrated by water a high loss will occur and the cable
will need to be replaced. Once assembled it is advisable to test the cable and connectors for
open and short circuits.
4.5.12
VSWR MEASUREMENT:
Voltage standing wave ratio (VSWR) is the ratio of detected volts from the forward RF
power, to the detected volts from the reflected (returned) RF power. This ratio is used to
measure the combined coax cable and antenna match. A good match will ensure that most of
the RF Power is radiated, whereas a bad match will result in the reflection of a large amount
of the power, thereby reducing the transmitter's range. A perfect match will give a 1:1 ratio
and bad match will give 2:1 or higher. For guidance, a good system will measure between
1.2:1 and 1.5:1.
4.5.13
Lightning Arresters
4.6
MOUNTING & INSTALLATION
At high or exposed sites, the use of a lightning arrester is recommended.
This in-line device fits between the antenna and the product with an earth strap connected to
ground. Should a lightning strike occur, the most of the energy should be diverted to ground
leaving the equipment with little or no damage.
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The ART Series are built into tough durable milled aluminium enclosures that can be
mounted in any plane, but should not be exposed to rain etc. as the enclosure and connectors
do not meet the relevant IP ratings.
If IP65, 67 or 68 is required then an additional enclosure will be required, details of suitable
enclosures are covered in the following pages.
TX/RX
ANTENNA
RX
TX/RX
ANTENNA
RX
TX
RXD
DCD
BUSY
TXD
RI
SYS
RTS
DSR
CTS
DTR
Program
R. F. Technologies Ltd.
ART Radio Modem
4.6.1
Select
12V
+ -
LINE
OUT
LINE
IN
RS232
GNDRSSI TX BUSYDI0 DI1 DO0 DO1
LEDLED TXE
BUS
12V
+ -
LINE
OUT
LINE
IN
RS232
GNDRSSI TX BUSYDI0 DI1 DO0 DO1
LEDLED TXE
BUS
ART DIMENSIONS
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4.6.2
ART MOUNTING
The ART Series can be DIN rail mounted or panel mounted with the optional mounting
bracket.
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4.6.3
ANTENNA CONNECTION THROUGH AN ENCLOSURE:
When an ART is used within an enclosure, the coax antenna cable can either be brought out
via a suitable gland or via the “N” type adapter kit shown above.
For IP68 installations, please consult the office for different enclosures.
4.6.4
WALL MOUNTING ENCLOSURE
The wall mounting enclosure has space for an ART400, power supply and re-chargeable battery.
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PROTOCOLS & APPLICATIONS
5.0
PROTOCOLS & APPLICATIONS
With the large available space in the ART’s flash memory, we hope to be able to develop a
range of PC selectable protocols to suit many different applications.
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5.1
STORE & FORWARD USING CLIENTS PROTOCOL.
The Store and Forward configuration can re-transmit all traffic it receives and in some applications this
may be required. However, to conserve valuable air time and hence improve the speed of the system,
normally only messages that are required to be forwarded on to a specific outstation are re-transmitted.
This is achieved by stripping out the addresses of incoming messages, comparing the address with the
list of outstation addresses stored in the unit and only forwarding on those that match. However, this
format requires knowledge of the clients protocol and some custom software.
The other option is to route messages via the addresses embedded in the radios, using the
Network mode. In either option there is normally local communication at the store and forward site,
via the RS232 port.
5.2
NETWORK ROUTING MODE
The RF Tech ART400 radio has a programmable, easy to use, low power, network mode
using the Hayes AT command set.
The radios are capable of relay operation and routing is under the control of the high level
application. A Hayes dial up command consists of the characters “ATD” followed by a
telephone number, in this application the telephone number is used to define the final
destination radio in a link and also the relay stations employed. As an example the dial up
command “ATD02346542” causes a link to radio number 42 to be established using radios 02,
34 and 65 as relays.
5.2.1
AT COMMAND SUMMARY
Commands are not case sensitive, when entered from a keyboard the backspace key may be
used to delete errors. Every command except the escape code (default +++) must begin with
the AT prefix and be terminated with a carriage return. The maximum command line length
is 40 characters. More than one command may be entered on a line and spaces may be
entered between commands, only the first command on a line should be prefixed by “AT”.
The following commands are supported, brackets indicate an optional parameter or
character, the S registers referred to are used to store parameters relevant to this mode of
operation, they may be also accessed using the PC setup programme:
AT
Attention. Required command prefix, except with the escape code (default
+++), use alone to test for the OK result code.
D (rr...)dd
Dial. The optional relay addresses (rr) and the destination address (dd)
should be entered as two digit decimal values in the range 00 to 99. Relay
addresses must be entered in the order they will be encountered with the
first relay address appearing immediately after the D character. Once entered
the radio will attempt to establish a link through the relays with the
destination.
For example;
ATD03
Dial out directly to radio number 3
ATD010203
Dial out to radio number 3, using radios 1 and 2 as relays.
Switch from command mode to transparent mode. Once transparent mode is
entered no more AT commands will be interpreted, transparent mode is
terminated with the escape code.
Hang up. The hang up command disconnects a link and should be issued to
the radio through which the link was originally established using the dial
command. If transparent mode has been entered the escape code must first
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be issued to return to command mode. Note that a faster disconnect is
possible using the RTS hardware handshake link.
&V
View the settings of all of the S registers and also the error code reporting
mode. The values in the S registers are loaded from Eeprom on power up or
following a reset command, they may be subsequently modified using other
commands, issuing “AT&V” views the active values held in volatile
memory, not those stored in Eeprom.
&W
Write the active S register values to Eeprom. This causes the S register values
to be preserved following loss of power or a reset.
Software reset. The radio is re-initialised and the S registers are overwritten
with the values stored in Eeprom.
Sr?
Display the value of S register r. For example issuing “ATS23?” displays the
value of S register 23.
Sr=n
Sets the value of S register r to the decimal value n. For example issuing the
command “ATS23=34” sets S register 23 to 34 decimal. The value n may be in
the range 0 to 255.
V(n)
Sets verbal or numeric result codes. Result codes are returned for most AT
commands and can be numeric (suitable for automated operation) or verbal
(suited for keyboard operation), the value of n determines the mode, if 0
numeric mode is set, if 1 verbal mode is set, omission of the value n causes
numeric mode to be set. For example issuing ATV1 sets verbal mode. Note
that storing the active configuration using the AT&W command does not
store verbal/numeric mode, verbal mode is always restored at power up or
reset.
Q(n)
Enables/disables result codes according to the value n. A value of 0 enables
codes, a value of 1 disables them, omission of n enables codes. Note that
storing the active configuration using the AT&W command does not store
this status, codes are always enabled at power up or reset.
I(0)
Information. The zero suffix may be omitted. This command returns a text
string giving information about the radio and its firmware version.
An example text exchange is given below:
TEXT SENT
TEXT RECEIVED
ATS23=2 V Q
OK
The radio address is set to 2, verbal
result codes are enabled.
ATD0504
NO ANSWER 05
A dial out to radio 4 via radio 5 was
attempted but radio 5 did not
respond.
ATD0604
CONNECT
A dial out to radio 4 via radio 6 was
attempted and the connection was
successful.
ATO
Transparent mode was entered, no
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result code is returned for this
command.
Hello Fred
Hello Bill
+++
Fred and Bill exchange data. This
data can be text or binary
information, the link is transparent
to all except the escape code.
The escape code was entered, no
response is given to the code.
ATH
OK
The link was disconnected.
ABC
ERROR
The command was not understood
as it is not valid.
5.2.2
POWER SAVING
The radio can be operated with or without power save enabled, typical applications might
utilise power save for some outstation radios, whilst relay stations would operate without
power save, this minimises call set up times. The power save duty cycle can be modified to
provide the best optimum between call set up time and power saving.
5.2.3
CALL SET UP PROCEDURE
Any radio in the network may be asked by its host to set up a data link to another radio, this
link may involve forwarding through intermediate radios. The radio must then using its own
intelligence set up that link and inform the host of success or failure, if successful the radio
will then enter a transparent mode where data applied is simply passed across the network to
and from the final destination. Transparent mode will then be terminated by the host and the
radio must then terminate the link.
A radio will spend most of its time with its processor shut down conserving power, the host
will wake up the radio by asserting RTS, when awake the radio will respond by asserting
CTS. The radio will now be in a control mode where it can respond to Hayes AT commands
to set up a link, once the link is established DCD is raised and the host is informed by the
returned AT error code that it may ask the radio to enter transparent mode, when this is done
the host may communicate over the network. When it has finished it may terminate
transparent mode either by using the AT escape code and then asking the radio to hang the
link, or by dropping RTS, the radio will then inform other elements of the link that the
transaction is complete, and drop DCD. If RTS is not active the radio will then return to sleep.
If during a transaction the link fails the radio must inform its host, since it is in transparent
mode it can only do this by dropping DCD. The host should then terminate in the usual
manner, and if necessary attempt the procedure again.
If a radio receives a request to set up a link with itself as the destination it will raise RI to
wake up its host, if auto answer is disabled it will wait for the "OFF LINE INACTIVITY" time
for the host to accept the call by raising RTS and issuing an ATO command, CTS will be
raised in immediate response to RTS. If auto answer is enabled the radio will wait for the
number of seconds programmed as the number of rings to wait in auto answer mode, it will
then enter transparent mode automatically but only if RTS has been raised. In either scenario
DCD is raised as soon as transparent mode is entered and the calling radio is informed that
the link is valid. The link will normally be terminated by the calling party, the radio will
inform its host that this has happened by dropping DCD, the host should then use the AT
escape code to terminate transparent mode or drop RTS. If RTS is not active CTS will be
dropped and the radio will return to sleep.
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Note that if RTS is dropped before a dial up command has been completed the link members
will be left in an undefined state waiting to time out. Also if the dialling radio is power saved
it will return to sleep before completing transmission of the AT error code to the host
resulting in corrupt serial data. It is therefore recommended that RTS should not be dropped
until commands have been completed and the appropriate error codes returned.
The operation of the hardware handshakes lines can be summarised as follows:
RTS when raised is a signal to the radio to wake up and enter command mode. Dropping
RTS cancels all operations and returns the radio to sleep.
CTS when raised provides acknowledgement that the radio is awake, or when dropped that
the radio is entering sleep.
DCD when raised is an indication that a link has been established and that transparent mode
is active, it is dropped when the link fails or is terminated.
RI when raised is an indication that an incoming call is being received.
5.2.4
RADIO ROUTING
Routing is determined by the dial up command used by the calling host. Radios will pass on
route information to all members of a link at the point of call set up. When a radio calls
another radio either because its host has requested a dial up or because it has been told by
another radio that it is to be part of a link, it first sends a wake up request to the next radio in
the route and waits for a reply, when this is received the route information is sent, no reply is
required to this message, the next message expected is a link fail or link established message
originating from the final destination radio. When received the link established message is
forwarded on to the original calling radio. If a radio fails to respond to the wake up signal the
radio calling it will return the address of the failed radio in the link fail message, a final
destination radio may also reply with a message indicating that the destination host did not
respond to the wake up procedure. This data is returned to the host by appending the "NO
ANSWER" error message with the failed address in ASCII numerals or the message "NO
PICK UP". If no link failed/established is received "NO ANSWER" is returned on its own.
5.2.5
WAKE UP PROCEDURE
Some radios in a network may have mains power supplies available and so do not need to
conserve power by sleeping, to accommodate such radios a single wake up message is sent
and a 1 second wait (programmable via the AT S registers) is imposed to allow a reply, a
radio knows whether the radio it is calling should be sleeping or not from its address value.
If the destination is a sleeping radio the wake up message is sent cyclically for 6 seconds
(programmable via the AT S registers) to allow a sleeping radio to hear it, when this is
completed a reply is waited on again for 1 second.
5.2.6
S0
IMPLEMENTED S REGISTERS
AUTO ANSWER
Sets the number of seconds to wait after raising RI before entering transparent mode or if
zero waits for the host to respond with an ATO command (up to the time set by S21).
S1
not implemented
S2
ESCAPE CHARACTER
Sets the value used for the 3 character escape code.
S3 to S11
not implemented
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S12
GUARD TIME
Sets the time in 20ms units required to separate the escape code sequence from other data.
S13
S14
SYSTEM ID LSB
SYSTEM ID MSB
Both bytes are transmitted and checked as part of every radio message.
S15
S16
MIN POWER SAVE ADDRESS
MAX POWER SAVED ADDRESS
All radios within the range max to min inclusive will operate in power saved mode. Any
commas with destination addresses in this range will start with a long wake up message.
S17
LINK ESTABLISHMENT TIME
This sets the time in 1 sec units that a calling radio will wait before reporting to its host that a
dial command has failed.
S18
CONNECTED INACTIVITY TIME
This time (in 1 sec units) is used as timeout for the following:
1/ receipt of a routing message following acknowledgement of a wake up call.
2/ receipt of a link establishment message from a down link radio when in relay
mode.
3/ receipt or transmission of data in transparent mode or relay mode.
Timeout results in the radio going back to idle mode (i.e. the link is cancelled).
S19
POWER SAVE ON TIME
The time in seconds for which the radio is asleep between checking for wake up signals.
S20
LONG WAKE UP SIGNAL DURATION
The time in seconds that the wake up message is sent to a power saved radio.
S21
OFF LINE INACTIVITY TIME
The time for which a radio will wait for its host to wake up after raising RI if auto answer is
disabled.
S22
not implemented
S23
MY ADDRESS
The radio's own network address.
S24
REPLY TIME
The time in 10ms units that a radio waits for a reply to a wake up call.
S25
AWAKE TIME
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The time in 10ms units that a radio checks for a wake up signal before returning to sleep.
Note that the radio requires an additional 20ms to initialise before starting this timer and also
that the awake time is terminated 30ms early if no carrier and data signal are detected. The
minimum recommended value for this S register is 8 resulting in a total awake time of 100ms
if a signal is present or 70ms if not.
PROGRAMMING
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6.1
INTRODUCTION
The ART Series can be programmed with any PC operating DOS via a standard 9W – 9W
RS232 cable. The programming software will allow user to configure the product to work
within many systems. At the time of writing this manual a Win98 version is under
development.
6.2
MEDIUM
6.3
CONFIGURATION OF THE A4P PROGRAM
This software is available on either 3.5 inch floppy or CD ROM.
To set up the programme for your computer put the supplied disc into the drive and type
"A4P/C", the /C extension causes the configuration mode to be entered. The programme
provides the user with instructions about what to do and allows set up for the type of
screen in use and selection of either comms port 1 or 2 for programming.
6.4
STARTING THE PROGRAM.
To start the programme, put the supplied disc in the drive and type "A4P" (Note: hard disc
users may wish to run the programme from hard disc, to do this copy the files named
A4P.EXE, RP.CFG and DEFAULTS.DAT to the appropriate directory and proceed as for a
floppy drive, if RP.CFG is not present is may be created by entering the configuration mode
by typing "A4P/C". On starting, the programme will load and display the opening menu.
6.5
CONNECTING THE ART FOR LOCAL PC PROGRAMMING
Connect the ART product to the designated PC's comms port via a normal 9Way to 9Way
RS232 cable.
6.6
PROGRAMMING/READING RADIO
To read or programme the radio both Switches on the front of the modem should be set
to zero (0). The radio data can be read via the “Read Radio” function or programmed via the “Program
Radio” function.
Note: Always Read the Radio First to check the RF power & Alignment Range.
When programming/reading has finished the screen reverts to normal. Normal operation of the radio is
resumed when the channel switches are set to a valid channel number.
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6.7
OPENING MENU
"Arrow Keys" are used to move round the menu and the RETURN key is used to make the
selection required. Whenever a programme is produced for a Radio Modem, it may be
given a name and stored and retrieved from disc by using the SAVE TO DISC and LOAD
FROM DISC options.
6.7.1
DIRECTORY DISPLAY
When “Load Program From Disc” is selected it is possible to display the directory containing
the relevant programs by following the prompt at the bottom of the screen. CTRL “D” is
used to select the required directory and pressing “ESCAPE” returns the Opening Menu
screen.
6.7.2
VERSION NUMBER & COMPATIBILITY MESSAGE
If new fields are added or changes are made to the PC program, the version number changes but in
most cases a new program will program older radios. To complicate matters more, over time there will
be changes and upgrades to the firmware in the radio which may not be compatible with older PC
programming software. To overcome this, each modem has a compatibility serial number which is
changed at the factory if and when the firmware changes. If the product and PC software is not
compatible, as a safety precaution the PC will not read or write to the modem but will display a
compatibility error message. If this happens a different edition of PC programming software with the
same compatibility number may be required.
6.7.3
EDIT NOTES
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The PC program has a text editor accessed from the main menu that will allow the user to
enter the unit’s hard link configuration and add notes if required. The file has defaults but
these can be over typed and changed as required. The print command will print the notes
together with all the programmed parameters.
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6.8
6.8.1
DESCRIPTION OF MAIN MENU EDIT FUNCTIONS:
MAIN MENU
To edit the radio modem programme data select “EDIT PROGRAMME” and the menu above
will be displayed: The up/down arrow keys are used to move the cursor round the fields on
the screen. To change a field press the RETURN key and then select the data with the
left/right arrow keys. Some fields will require you to type in data, e.g. channel Numbers or
channel frequencies. After confirming the selected data is correct press the RETURN key to
enter. If you want to change the data once it's been entered, just move the cursor to the
desired field and press RETURN. You can then repeat the operation.
6.8.2
RADIO MODE
This function selects Semi-duplex/Simplex or Duplex operation
6.8.3 FREQUENCY RANGE
This selects the frequency range and covers the discrete VHF, UHF and 900MHz
bands, or specific telemetry band allocations used in various countries.
To Check the programmable range of the product connected, look at the Alignment
range field.
VHF
138 – 155MHz
150 – 175MHz
175 – 225MHz
UHF
406 - 475MHz
900MHz
820 – 950MHz
Pre-set
MPT1411 Outstation
MPT1411 Scanner
MPT1329
6.8.4
ALIGNMENT RANGE
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This reads from programmable range and the channel spacing of the connected radio
e.g. F3 458 – 4760MHz 12.5KHz
TX F3 458 – 470MHz RX F2 430 – 442MHz 12.5KHz
6.8.5
CHANNEL SELECTION MODE
There are two ways of setting up channels on the radio, in INCREMENTAL mode a start
frequency for both RX and TX is set up along with a channel increment and the desired
number of channels, for example entering 450MHz as the RX and TX start frequency, 5 as the
number of channels, and 12.5kHz as the channel increment, will result in frequencies of
450.0000, 450.0125, 450.0250, 450.0375, and 450.0500 being allocated to channels 1 to 5 of the
modem, the TX and RX frequencies can be offset by using different start frequencies. Up to 80
channels can be programmed in this way. (Note that selection of MPT1329 or MPT1411 for
frequency range forces use of incremental mode and inhibits alteration of the number of
channels or their spacing). In DISCRETE mode channel frequencies may be explicitly entered
in the channel data and do not have to conform to any regular spacing.
6.8.5.1
Number of Channels
This option sets the number of channels required in INCREMENTAL channel selection mode,
it is suppressed when the mode is set to DISCRETE. See the section on CHANNEL
SELECTION MODE for more detail.
6.8.5.2
Channel Increments
This option sets the channel spacing required in INCREMENTAL channel selection mode, it
is suppressed when the mode is set to DISCRETE. See the section on CHANNEL .
6.8.5.3
RX Start Frequency
This option sets the channel one RX frequency required in INCREMENTAL channel selection
mode, all subsequent channels are spaced above this frequency separated by the CHANNEL
INCREMENT, it is suppressed when the mode is set to DISCRETE. See the section on
CHANNEL SELECTION MODE for more detail.
6.8.5.4
TX Start Frequency
This option sets the channel one TX frequency required in INCREMENTAL channel selection
mode, all subsequent channels are spaced above this frequency separated by the CHANNEL
INCREMENT, it is suppressed when the mode is set to DISCRETE. See the section on
CHANNEL SELECTION MODE for more detail.
6.86
POWER RANGE
This option is used to select either the 10mW - 1Watt or 50mW - 5Watt transmitter version.
6.8.7
TX POWER
The required transmitter power in watts can be entered in this field.
Fore example 1.32Watts or 0.05 Watts.
6.8.8
POWER SAVE OPTIONS
The save on, save off and resume time are all programmable parameters to provide further
power saving features.
6.8.8.1
Save On Time
This is for power save programming and sets the time the transceiver is switched off for
during the power save cycle (Power Save On). The Save On Time is programmable from
0 - 1500ms in 50ms steps. A setting of 0 disables power save.
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6.8.8.2
Save Off Time
This is for power save programming and sets the time the transceiver is switched on for
during the power save cycle (Power Save Off). The Save Off Time is programmable from
100 - 1500ms in 50ms steps. The default setting is 100ms.
6.8.8.3
Save Resume Time
When a carrier is received during power save mode, the unit will come out of its powersave
mode to receive the signal. The Resume Time, is the time the receiver stays active after the
received carrier has dropped out, i.e. the time power save mode is deferred. This is
programmable between 0 - 255 seconds in 1 second steps.
6.8.9
SERIAL NUMBER
The serial number may not be altered using the set up program, it does however provide the
user with the means to read it.
6.8.10
NOTE PAD
The notepad provides a facility for storing up to 48 ASCII characters in the modem's
memory.
6.8.11
LOCKOUT TIME MODE
Selectable either resetable or cumulative.
6.8.12
LOCKOUT TIME
Selects the transmit timeout timer period, 0 - 255 seconds in one second steps.
6.8.13
AUDIO RESPONSE
This option sets the response of the receiver’s and transmitter’s audio path to either flat or de/pre-emphasised. When de-/pre-emphasised is selected a 300Hz low pass filter is also
switched in.
Note: IF INTERNAL MODEM OPERATION IS REQUIRED THE RX AUDIO RESPONSE
SHOULD BE SET TO A FLAT RESPONSE.
6.8.14
CARRIER MUTE
The receive audio path can be set to mute when no incoming carrier is detected if this option
is turned on.
6.8.15
MENU OPTIONS
6.8.15.1
Return to Main Menu
As suggested this function returns the Main Menu.
6.8.15.2
Edit Channel Data
This field takes you into the Channel Data Screen
6.8.15.3
Edit Modem Setup
This field takes you into the modem setup menu
6.8.15.3
Custom Menus
If custom options have been ordered (such as Store and Forward) then this menu will allow
access for programming.
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6.9
MODEM EDIT MENU
6.9.1
RADIO BAUD RATE
Sets the baud rate of the internal radio modem, (currently 150 – 9600 baud within the
prescribed 12.5KHz channel) this setting does not govern the speed at which the serial port
operates which should be set either at the same speed or a higher speed. The radio baud rate
should be set at the minimum possible to maintain the required throughput, lower speeds
will give better results in poor signal conditions.
6.9.2
RADIO DATA BITS
Selects either 7 or 8 bits
6.9.3
RADIO PARITY
Selects none, even or odd
6.9.4
RADIO STOP BITS
Selects either 1 or 2.
6.9.5
FFSK TONE SET
Selects either Bell 202 or V23 mode 2, Bell 202 tones should be selected if possible since their
wider separation yields better performance, V23 tones however are more common in existing
systems. The tone set is fixed at speeds above 1200 baud.
6.9.6
FFSK SYNC/ASYNC
Allows either synchronous or asynchronous selection at up to 1200 baud FFSK.
6.9.7
SERIAL BAUD RATE
The serial port baud rate may be set independently from the radio baud rate in the range
150 to 38400bps. The setting should always be the same speed or higher than the radio baud
rate.
6.9.8
SERIAL DATA BITS
Selects either 7 or 8 data bits for the serial port.
6.9.9
SERIAL PARITY
Selects: none, odd or even parity for the serial port.
6.9.10
SERIAL STOP BITS
Selects 1 or 2 stop bits for the serial port.
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6.9.11
RTS/CTS HANSHAKE
On or Off can be selected
6.9.12
DCD OPERATION
This option is used in conjunction with the internal modem and is used to select DCD line
active on detection of RF Only or RF and Data.
6.9.13
DTR SHUTDOWN
Enables DTR to be used for external power save.
6.9.14
LEAD IN DELAY
Selects the time the RF carrier is raised before the transmission of data via the internal
modem takes place, for more detail see the section of this manual describing transmit/receive
timing. The delay is programmable from 0 to 2500ms in 10ms steps.
6.9.15
LEAD OUT DELAY
Selects the time the transmitter remains up after the data has been sent. Used sometimes to
give a finite quiet pause after the data has been sent, for more detail see the section of this
manual describing transmit/receive timing. The delay is programmable from 0 to 2500ms in
10ms steps.
6.9.16
EMBEDDED CONTROL
The embedded control addresses are used in conjunction with the network routing mode
discussed is section 5.
6.9.16.1
Network I.D.
The Network I.D can consist of up to 4 digits and differentiates one network or a sub network
from another.
6.9.16.2
Network Address
The Network Address is the actual address of the radio modem.
6.10
EDIT CHANNEL DATA
This field takes you into the Channel Data Screen
6.10.1
CHANNEL DATA SCREEN:
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6.10.2
DESCRIPTION OF CHANNEL DATA MENU FUNCTIONS:
The channel data screen is displayed when "EDIT CHANNEL DATA" is selected from the
main edit menu. Up to 32 channels may be edited in discrete channel selection mode, and up
to 80 in incremental mode. The channel number displayed at the top right of the screen
corresponds to the channels that may be selected by the bcd channel switches in the modem.
The channels can be stepped through one by one using the NEXT and PREVIOUS
CHANNEL options.
6.10.3
RX & TX FREQUENCY
In incremental channel selection mode the frequencies are displayed for information
purposes only and may not be edited, in discrete mode each frequency must be explicitly
entered. For convenience the TX frequency can be made the same as the RX frequency by
hitting the space bar when prompted for an entry.
6.10.5
NEXT/PREVIOUS CHANNEL
By pressing the Enter key the next or previous channel is displayed.
6.10.6
EDITING CHANNEL
Press the Enter key and then use the Arrow keys to select the required channel number, then
press the Enter key again to display the channel information.
6.11
CALIBRATE MENU (FACTORY & SERVICE CENTRE OPTION)
Only the Line input level, Line output level, RSSI Test, Input Voltage Test & Temperature
Test options within this menu are available to users, the other functions are for factory
alignment only and have been inhibited.
6.11.1
TEST MAX POWER/MOD BALANCE
This selects the maximum power for TX alignment and modulates the Transmitter with a
50Hz square wave to balance the modulation point.
6.11.2
SET TX FREQUENCY
This adjusts the transmitter’s frequency by varying the voltage to the VCTCXO.
It is normally set to the mid point +/-2.5V and the frequency is then set up with
the variable capacitor in the VCTCXO. This enables later electronic adjustment to be carried
out via a PC or over the radio link.
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6.11.3
SET RX FREQUENCY
This adjusts the receiver’s frequency by varying the voltage to the VCTCXO.
It is normally set to the mid point +/-2.5V and the frequency is then set up with
the variable capacitor in the VCTCXO. This enables later electronic adjustment to be carried
out via a PC or over the radio link.
6.11.4
CALIBRATE POWER
Following the menu, the operator adjusts the power output via the arrow keys and enters
requested levels. These levels are used to calibrate the particular RF power profile of the
individual product. This profile is then used to accurately select the required RF power level
via the PC program or over the air.
6.11.5 SET PEAK DEVIATION
Using the up/down arrow keys the peak deviation level is set for the required channel
spacing.
6.11.6 INTERNAL MOD LEVEL
The internal modulation level adjustment sets the normal modulation level for the product.
6.11.7 SET LINE INPUT LEVEL & SET LIN OUTPUT LEVEL
These options allow the line input and output levels to be adjusted between –20 and +3dBm.
6.11.8
CAL RSSI
In the same way as the RF power calibration profile is built up, so the RSSI profile is built. Once the
profile is in the product, a calibrated RSSI level can be observed on a connected PC or over the radio
link.
6.11.9
RSSI TEST
Will read a calibrated -15 to +30dBuV for antenna alignment and range testing
6.11.10
TEMP/PSU TEST
This function measures the internal temperature of the radio and the input voltage level
of the connected power supply.
6.11.11 RETURN TO MAIN MENU
Simply returns the user to the Main Menu
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SOFTWARE & ANCILLARY ITEMS
7.1
PC SOFTWARE
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Dedicated PC software has been written to support the ART series, to enhance its operation, and
provide unrivalled versatility. The software covers local & remote programming, installation, network
management, local & remote firmware upgrades, first line service and factory testing.
7.2
CLIENT PROGRAMMING SOFTWARE
Programming software in DOS (with Windows 95/98 being written) is available for the ART Series, a
full description of the DOS version is outlined in section 6.
7.3
FACTORY PROGRAMMING SOFTWARE
The factory version includes all the factory alignment and test additions.
7.4
BIT ERROR RATE (BER)SOFTWARE
The BER Test software, enables two ART’s to communicate via serial ports on two PC’s for the
purpose of BER testing and provides a quick and easy Go/No Go test.
7.5
TEST & ALIGMENT SOFTWARE
The ART products have extensive self test routines built into the product and under the control of PC
software, in conjunction with an RF test set, the ART will perform an in-depth self test of the
Receiver, Transmitter & Control and interface board, even down to plotting the individual frequency
responses curves of the data paths. This can be used in first line testing of the product and for realignment when used in conjunction with suitable test equipment.
7.6
NETWORK MANAGEMENT SOFTWARE
7.6.1
INSTALLATION
At the point of installation, the Network Management software provides engineers with
relevant software tools to align antennas, check path links in both directions and provide performance
data of the link at various RF levels with different baud rates.
7.6.2
OPERATION WITHIN THE NETWORK
Once the network is operational, the software can be used to continue monitoring the link’s
performance as well as being able to reprogram any, or all of the outstations normal programmable
parameters remotely over the radio link.
7.6.3
ADDITIONAL FEATURES
In additional to the normal programming parameters the following information can also be retrieved
from the network..
7.6.3.1
Internal Temperature Measurement
The internal temperatures within the ART’s in the network and within the base station can be
displayed, this is very useful for looking at any frequency drift or performance problems due to
abnormally high or low temperature differentials.
7.6.4.2
Input Power Supply Voltage
Although the ART can work at 100% with an input voltage as low as 9V6DC. The normal input would
be 12VDC, hence the ability to measure and display the input voltage at each and every ART within
the network could be very useful, as it would show battery performance trends over time and alert the
user of possible battery problems, long before they became a problem.
7.6.4.3
RX & TX Frequency offset measurement & TCXO re-alignment
Any receiver or transmitter frequency off set at an outstation or repeater can be measured and the
percentage offset compared to the base station. If the off set is outside reasonable limits, a global or
individual command will re-align the oscillators to that of the base station.
7.6.4.4
Local/Remote Firmware Upgrades
Provided the optional memory card is fitted, the user can download new firmware to one or all of the
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outstations, via the very safe and secure encrypted protocol within the network management software.
7.6.4.5
Local I.O. Control
The ART has two digital inputs and two digital outputs for local control & monitoring,
With the aid of the network management software these I.O can be read or set.
7.7
FUTURE SOFTWARE DEVELOPMENTS
As the I.O. and other products are developed, so software will be developed to provide the user as
much flexibility as possible.
7.7.1
Non Intrusive Network Management Software
Network Management software is in the process of being completed and will enable system operation
and performance to be monitored via an XT9000 base , independently to the protocol running.
Alternatively, the commands and controls could be written and included in the system software.
7.8
ANCILLARY PRODUCTS
7.8.1
POWER SUPPLIES WITH CHARGERS
ART750 80- 250VAC to 12VDC 3 Amps with backup battery charger & fault
reporting via the I2C Bus
ART751 80 – 60VDC isolated to 12VDC 3 Amps with backup battery
charging and fault reporting via the I2C bus
7.8.2
RF POWER AMPLIFIERS
ART400PA-10 UHF 5Watt to 10Watt RF power amplifier with built-in VSWR facility that
measures Forward & Reflected power and conveys the information back to
the ART400 via the I2C bus.
ART400PA-25 As above but 25Watts.
ART170PA-10 VHF 5Watt to 10Watt RF power amplifier as the ART400PA-10
ART170PA-25 VHF 5Watt to 25Watt RF power amplifier as the ART400PA-25
7.8.3
DIN I.O. MODULES
ART710
8 Digital programmable Input or Output
ART720
4 12bit Analogue Outputs Current
ART721
4 12bit Analogue Outputs Voltage
ART730
4 12bit Analogue Inputs Current or Voltage
ART740
4 Digital I.O. 2 12bit Analogue Inputs, 2 12bit Analogue Outputs
ART780
I2C Protocol converter to MODBUS, CANBUS, DEVICENET etc.
ART781
2 x RS232/485 to I2C Bus converter
ART782
GPS module
ART790
Duplicated controller
7.8.4
ENCLOSURES
19 inch rack to take an ART400 and power supply
Lockable IP51 wall cabinet to take an ART400, power supply, I.O. and
backup battery.
IP67/68 Enclosures available to take most modules
7.8.5
LEADS & CABLES
RS232 cable 9 Way "D" to 9Way “D”
Store and Forward & Repeater connecting lead between to radios
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“N” to BNC Coax Cable Adapter for Chassis Mounting
7.9 ADAPTERS & PARTS
Duplexer
Transmitter circulator
Receiver Antenna Splitter
External Solid State Antenna Switch
Lightning Arrester with “N” Connectors
Lightening Arrester with “BNC” Connectors
7.10
MANUALS
Programming, installation and operations manual
7.11
BACKUP BATTERY PACKS
Full range in stock to fit the above enclosures.
7.12
ANTENNAS
We stock a full range of antennas for most applications. For a full list please contact the sales office.
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---

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