User`s guide

Serial
This table gives the correct pinouts for the printer end of the 25-pin
serial cable used to connect a computer and printer:
Pinout:
Serial
Pin No. Name
2 Transmit Data
3 Receive Data
4 Request to Send (optional)
5 Clear to Send
6 Data Set Ready (optional)
7 Signal Ground
8 Receive Line Signal Data
20 Data Terminal Ready (optional)
24 Reserved
25 Reserved
Appendix A
Cable Pinouts A-5