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Serial
The table below 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
2TxD
3 RxD
4 RTS (optional)
5CTS
6 DSR (optional)
7 GND
20 DTR (optional)
IBM PC/XT, PC/AT, and Compatible Computers
Pinout:
IBM PC/XT
Printer IBM PC/XT
DB-25S DB-25P
1 1
23
32
45
54
20 6+8
6+8 20
77
Pinout:
IBM PC/AT
Printer IBM PC/AT
DB-25S DB-9P
1 1
22
33
75
20 6+8
Appendix B
B-12 Technical Specifications