User's Manual

CONNECTION
The radio antenna connects by means of a BNC miniature coaxial connector. All other
connections to the T200 transceiver are made using a standard 9-way D type connector as
detailed in the table below.
PIN NAME FUNCTION REMARKS
1 MOD I/P Data modulation input To transmitter, TTL/CMOS compatible
2 DATA O/P Receiver Output
5V CMOS levels, high ( +5V) when no
signal present
3 bTbX bE transmit enable
HIGH >2.5V = receive
LOW <0.8V = transmitter enabled
4 0V 0 volts common DC and signal ground
5 + Vin positive supply +10 to +14 V DC
6 SQF Squelch flag output
HIGH (+5V, 10kS pull-up) = Signal present
LOW (<0.8V) = Signal not present
7 CS channel select Serial channel select input (RS232
compatible)
8 RSSI Received Signal Strength
Indicator
+1 to +3V DC nominal, 50dB range
9 0V 0 volts common DC and signal ground
PROGRAMMING
The software supplied with the T200 transmitter is the single channel TPRG.exe program. The
software can be run on a PC with the serial port connected to pin 7 of the transmitter via a
suitable adaptor as shown in Figure 1. The unit may be programmed in-situ provided that pin 7
is available. There is no feed-back facility with this circuit, and for this reason, the TPRG software
repeats the programming three times to eliminate error.
This version of software is programmed by a series of 8 byte data packets at 1200 baud. Each
packet includes a 16 bit sync code and an 11 bit checksum to eliminate the possibility of
spurious programming.