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- Arc to TNC - RS232 Cable connections
- ------------------------------------
-
- ARC 9-WAY D CONNECTOR TNC 25-WAY D CONNECTOR TNC 9-WAY CONN.
-
- No connection 1 Cable screen No connection
- 3 TXD 2 TX data 3 TX data
- 2 RXD 3 RX data 2 RX data
- 7 RTS } * 4 RTS 7 RTS
- } 20 DTR
- 6 DSR 5 CTS 8 CTS
- 5 Signal gnd 7 Signal gnd 5 Signal gnd
- 1 DCD}
- 4 DTR} Linked together No connection No connection
- 8 CTS}
- 9 Ring indicator # 8 Connect status No connection
-
- * Some TNCs like the PK use pin 4 (RTS) for the handshake input, whereas
- others like the BSX2 use pin 20 (DTR) instead. So, if you make up a cable
- with RTS from the Micro connected to both 4 and 20 on the TNC, then it
- should be suitable for any TNC you are likely to use. Note the rather
- strange connections for the Arc; similar to a PC AT but definitely
- different! DSR is used instead of CTS, and this is quite deliberate.
-
- # Connecting this line allows !ComLink to detect a 'Connect' at the TNC.