Furness controls FCO770 - Page 80

Page 80 FCO770 Users Guide Issue 1
It is also common to use a 3 wire cable with the handshake lines looped back at each end:
FCO770 D Connector COMPUTER D Connector
9-way 25-way 9-way
2 Rx 2 Tx 3 Tx
3 Tx 3 Rx 2 Rx
5 GND 7 GND 5 GND
4 DTR 5 CTS 8 CTS
8 CTS 6 DSR 6 DSR
* 1 CD 8 CD 1 CD
* 6 DSR 20 DTR 4 DTR
* These are not required but can be connected to make the cable the same both ends
when connecting to a 9-way computer port.