connector wiring scheme
| Pin | Signal | Description | Direction |
|---|---|---|---|
| 1 | +CA1F | X.21 control, +CHA1 | output |
| 2 | 232TXDA1 | Transmit data, CHA1, RS-232 | output |
| 3 | -CA1F | X.21 control, -CHA1 | output |
| 4 | 1RTSA | Ready To Send, CHA1, RS-232 | output |
| 5 | 1CTSA | Clear To Send, CHA1, RS-232 | input |
| 6 | +CB1F | X.21 control, +CHB1 | output |
| 7 | 232TXDB1 | Transmit data, CHB1, RS-232 | output |
| 8 | -CB1F | X.21 control, -CHB1 | output |
| 9 | 1RTSB | Ready To Send, CHB1, RS-232 | output |
| 10 | 1CTSB | Clear To Send, CHB1, RS-232 | input |
| 11 | +1B1 | X.21 indication, +CHB1 | input |
| 12 | 232TXDA2 | Transmit data, CHA2, RS-232 | output |
| 13 | 2RXDA | Receive data, CHA2, RS-232 | input |
| 14 | 2RTSA | Ready To Send, CHA2, RS-232 | output |
| 15 | 2CTSA | Clear To Send, CHA2, RS-232 | input |
| 16 | +IA1 | X.21 indication, +CHA1 | input |
| 17 | 232TXDB2 | Transmit data, CHB2, RS-232 | output |
| 18 | 2RXDB | Receive data, CHB2, RS-232 | input |
| 19 | 2RTSB | Ready To Send, CHB2, RS-232 | output |
| 20 | 2CTSB | Clear To Send, CHB2, RS-232 | input |
| 21 | +422TXCA1 | +Transmit clock, CHA1, RS-422 | input |
| 22 | -422TXCA1 | -Transmit clock, CHA1, RS-422 | input |
| 23 | +422RXDA1 | +Receive data, CHA1, RS-422 | input |
| 24 | -422RXDA1 | -Receive data, CHA1, RS-422 | input |
| 25 | +422RXCA1 | +Receive clock, CHA1, RS-422 | input |
| 26 | -422RXCA1 | -Receive clock, CHA1, RS-422 | input |
| 27 | +422TXDA1 | +Transmit data, CHA1, RS-422 | output |
| 28 | -422TXDA1 | -Transmit data, CHA1, RS-422 | output |
| 29 | +422TXCB1 | +Transmit clock, CHB1, RS-422 | input |
| 30 | -422TXCB1 | -Transmit clock, CHB1, RS-422 | input |
| 31 | +422RXDB1 | +Receive data, CHB1, RS-422 | input |
| 32 | -422RXDB1 | -Receive data, CHB1, RS-422 | input |
| 33 | +422RXCB1 | +Receive clock, CHB1, RS-422 | input |
| 34 | -422RXCB1 | -Receive clock, CHB1, RS-422 | input |
| 35 | +422TXDB1 | +Transmit data, CHB1, RS-422 | output |
| 36 | -422TXDB1 | -Transmit data, CHB1, RS-422 | output |
| 37 | GND_6 | Extra ground | |
| 38 | 2TXCA | Transmit clock, CHA2, RS-232 | input |
| 39 | 2RXCA | Receive clock, CHA2, RS-232 | input |
| 40 | 2RXCB | Receive clock, CHB2, RS-232 | input |
| 41 | GND_5 | Extra ground | |
| 42 | 2TXCB | Transmit clock, CHB2, RS-232 | input |
| 43 | 1DSRA | Data Set Ready, CHA1, RS-232 | input |
| 44 | 1DCDA/-IA1 | Data Carrier Detect, RS-232/X.21 indication, -CHA1 | input |
| 45 | 1DTRA | Data Terminal Ready, CHA1, RS-232 | output |
| 46 | 1RIA | Ring Indicator, CHA1, RS-232 | input |
| 47 | GND_4 | CHB2 ground | |
| 48 | 1DSRB | Data Set Ready, CHB1, RS-232 | input |
| 49 | 1DCDB/-IB1 | Data Carrier Detect, RS-232/X.21 indication, -CHB1 | input |
| 50 | 1DTRB | Data Terminal Ready, CHB1, RS-232 | output |
| 51 | 1RIB | Ring Indicator, CHB1, RS-232 | input |
| 52 | GND_3 | CHA2 ground | |
| 53 | 2DSRA | Data Set Ready, CHA2, RS-232 | input |
| 54 | 2DCDA | Data Carrier Detect, CHA2, RS-232 | input |
| 55 | 2DTRA | Data Terminal Ready, CHA2, RS-232 | output |
| 56 | 2RIA | Ring Indicator, CHA2, RS-232 | input |
| 57 | GND_2 | CHB1 ground | |
| 58 | 2DSRB | Data Set Ready, CHB2, RS-232 | input |
| 59 | 2DCDB | Data Carrier Detect, CHB2, RS-232 | input |
| 60 | 2DTRB | Data Terminal Ready, CHB2, RS-232 | output |
| 61 | 2RIB | Ring Indicator, CHB2, RS-232 | input |
| 62 | GND_1 | CHA1 ground | - |