Commonly Used Serial Cable Configurations
IBM 25-Pin Cable Configuration
Computer
IBM 9-Pin Cable Configuration
Computer
Printer
PG 1
1 PG
TD 2
3 RD
RD 3
2 TD
CTS 5
11 SSD
DSR 6
20 DTR
6 DSR
SG 7
7 SG
4 RTS
5 CTS
Printer
RD 2
2 TD
TD 3
3 RD
SG 5
7 SG
DSR 6
20 DTR
6 DSR
CTS 8
11 SSD
4 RTS
5 CTS
Appendix A: Interfacing
135