Connector Pinouts
190-01810-00 GDL 82 TSO Installation Manual
Rev. 5 Page 5-4
5.2.2 RS-232
The RS-232 port is compatible with EIA Standard RS-232C with an output voltage swing of at least ±5 V when driving
a standard RS-232 load.
Table 5-4 RS-232
5.2.3 Discrete Inputs
Table 5-5 Discrete Inputs
Squat Switch*
Depending on whether the input is ground or open, the Squat Switch* discrete determines when the aircraft is
airborne or on the ground.
Anonymous Mode*
The Anonymous Mode* discrete input supports activation of the anonymous mode feature. When the discrete is
grounded and the integrated transponder is tuned to the configured VFR squawk code, the GDL 82 will enter
anonymous mode. If the integrated transponder is not tuned to the VFR squawk code, the GDL 82 will not enter
anonymous mode in either discrete state.
PIN NAME CONNECTOR PIN I/O
RS-232 TX 1
P821 8 Out
RS-232 RX 1
P821 9 In
PIN NAME CONNECTOR PIN I/O
SQUAT SWITCH*
P821 4 In
ANONYMOUS MODE*
P821 5 In
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