User's Manual

75
Appendix A: Communications Port
The RS232 communications port (COM) is located on the rear panel
of the computer unit. The serial communication has the following
characteristics (8: n: 1) and is transmit only:
• One (1) start bit
• Eight (8) data bits
• No parity
• One (1) stop bit
• Transmission at 1200 baud
The G3™ transmits data as ASCII symbols in the following
digit sequence:
Target Patrol
[hundreds][tens][ones] ASCII [hundreds][tens][ones]
carriage return<CR>
(<CR> = ASCII decimal value 13)
The G3™ sends the data in this sequence when the TARGET or
PATROL speed display changes, or when the MODE or antenna
(ANT) selection changes. During the test sequence the target and
patrol speeds transmit, but the display segment check data do not.
When you press the LOCK button, the G3™ transmits the following
digital sequence
[hundreds][tens][ones]<CR>
(<CR> = ASCII decimal value 13)
G3™ User & Installation Manual