GAI-Tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telephone Interconnect Installation & Service Manual - Manual (Page 18)

Installation PL1877A Microprocessor Radio Telephone Interconnect
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P1 Radio Connector
The 16-pin radio connector (P1) pin designations are shown below. Refer to the applicable section of
this manual for your specific radio for more detailed information on its installation.
Radio Connector Pinout
P1 Radio Connector Pin Chart
Pin No. Wire Color Function
1 Red/Black PL Strip
2 Red PL Strip Return
3 Orange Monitor
4 Orange/Black Monitor Return
5 White PTT
6 Green PTT Sense
7 White/Black Data TX (TPL and DPL signal output)
8 Blue White TX Audio
9 Blue/Black TX Audio Return
10 Green/White RX Audio Return
11 Green/Black RX Audio
12 Black PL Detect
13 Blue Carrier Detect
14 Black/White Optional Input #1
15 Red/White Patch Inhibit
16 Not connected Optional Input #2
The PL1877A has been designed with several diagnostic tests to assist you in set-up and troubleshooting.
Entry into the diagnostic mode is made by simultaneously pressing the
UP and DOWN buttons.
To step to another test once the diagnostic mode has been entered, press the PATCH ON/OFF button. To
exit, press both the UP and PATCH ON/OFF buttons simultaneously.
Each time a new test is selected, a test timer is set to 15 minutes. If this timer reaches zero, the patch
resets itself to idle, ready for normal operation.