IBM 19 - Manual (Page 376)

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
2 TxD
3 RxD
4 RTS (optional)
5 CTS
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
2
3
3 2
4 5
5 4
20 6+8
6+8 20
7 7
Pinout:
IBM PC/AT Printer IBM PC/AT
DB-25S DB-9P
1 1
2
2
3 3
7 5
20 6+8
Appendix B
B - 1 2 T e c h n i c a l S p e c i f i c a t i o n s
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