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ADX-140 Remote / GPI Connector Pinout (DB9 Female)
GPI inputs are TTL-compatible inputs, pulled up to +5 volts with a 5K resistor. They
should be pulled to ground with a dry switch closure to activate.
RS232 Remote port is 38.4K Baud, One Stop Bit, No Parity
*GPIs 1 and 2 may be used to implement a talkback function for the first two mic
inputs. They may be controlled with a hand-held pushbutton switch, for example.
If GPI 1 is closed to ground (switch between pins 5 and 6 on the connector), Mic 1 is
muted on its normal path, and routed to the mic 3 (TB1) path. A rapidly-flashing
yellow LED adjacent to the Mic 3 connector indicates that this is happening.
GPI 2 does the same thing for Mic 2 (routed to the Mic 4/TB2 path).
Note that the GPIs must be enabled in the ADX-140 menu.
Pin #
Function
1
Ground
2
RS232 Data Out (TX)
3
RS232 Data In (RX)
4
(no connection)
5
Ground
6
GPI 1 In (Talkback 1)*
7
GPI 2 In (Talkback 2)*
8
GPI 3 In (Unused)
9
Ground
21
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