User manual

Communication Modes and Cabling Options
Cable
Mode
Board A Board B
Pins Pins
Simplex 2-wire Receive Only Rx- 1 2
Rx+ 9 3
Simplex 2-wire Transmit Only Tx+ 2 9
Tx- 3 1
Half-
Duplex
2-wire TRx+ 2 2
TRx- 3 3
Full-Duplex 4-wire w/o local echo Tx+ 2 9
Tx- 3 1
Rx- 1 3
Rx+ 9 2
Manual 104-ICOM-2S, 104-COM-2S 15