User`s guide

Non-proprietary I/O Port Specifications
007-4701-003 171
Table A-15 DB-9 Serial Connector Pin Assignments
DB-9 Connector Pin Pin Assignment
1 Data carrier detect (DCD) (not used)
2 Receive data (RD)
3Transmit data (TD)
4 Data Terminal Ready (DTR) (not used)
5Ground
6 Data set ready (DSR) (not used)
7 Request to send (RTS)
8 Clear to send (CTS)
9 Ringing indicator (RI) (not used)