Revision B 24/04/03
Page 4 of 18
The SRT Series are high quality receivers with an RS232 output and two addressable digital
outputs. Designed for the Paging and Data markets, the products are available in the VHF,
280MHz, 320MHz, UHF & 930MHz bands.
The
SRT series feature f
lash processor to allow easy program upgrades or changes should
they be required. The receiver is built into a small, milled aluminium housing which can be
DIN
or panel
mounted
.
1.1 APPLICATIONS
The SRT receivers can be used in wide or local area paging
and d
ata systems.
Applications include; information receivers, wireless local or wide area sign control, point
and multi-point data distribution, remote control of systems & equipment, telemetry and
transmitter site monitoring.
For suitable local area transmitters, see the ART series
of Data
& Paging transmitters.
1.2 SPECIFICATION:
The SRT products have been developed for use in areas of high interference and low signal
levels, but where the correct reception of data is still critical. Particular attention has been
given to the sensitivity, Intermodulation, selectivity, blocking and spurious response
parameters to ensure the product will perform in even the worst areas.
1.3
RS232 SERIAL PORT
The SRT receivers have a programmable RS232 port that may be programmed for
for 1200, 2400, 4800 or 9600bps with various data and stop bits.
1.4 PROGRAMMING
The SRT Series can be programmed directly from a PC. Programmable
parameters include; RF channel, POCSAG or Data mode, Serial port set-up &
Power save functions.
1.5 RSSI
The Receivers Signal Strength is measured within the receiver and the DC voltage
representing the level is fed to both the internal processor and outside via the 15W
“D” connector. The internal processor converts this voltage to a uV value which can be read
by a host PC or microprocessor to provide link conditions during set-up.
1.6 SOFTMODEM
The SRT features a “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.
The current firmware supports; 150-2400bps FFSK with Bell202 & V23 supported, 150-4800
FSK, 4800bps GMSK & 512, 1200 & 2400 POCSAG.
1.7
REMOTE SWITCH APPLICATIONS
The SRT Receivers have two programmable open collector outputs and in the paging mode
they can programmed with unique addresses for stand alone remote switch operation within
a paging scheme. The switches can be operated in an On/Off, Momentary or programmable
timed mode.
1.8 EXTERNAL
AUDIO
OUTPUT
A buffered audio output has been provided where the internal modem is not required.
1.9
EXTERNAL DIGITAL OUTPUT
