Serial; Ibm Pc/Xt, Pc/At, And Compatible Computers - QMS 19 User Manual

Appendix B

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

IBM PC/XT, PC/AT, and Compatible Computers

Pinout:
IBM PC/XT
Pinout:
IBM PC/AT
B - 1 2
EDNord - Istedgade 37A - 9000 Aalborg - telefon 96333500
Pin No. Name
2 TxD
3 RxD
4 RTS (optional)
5 CTS
6 DSR (optional)
7 GND
20 DTR (optional)
Printer
DB-25S
1
2
3
4
5
20
6+8
7
Printer
DB-25S
1
2
3
7
20
T e c h n i c a l S p e c i f i c a t i o n s
IBM PC/XT
DB-25P
1
3
2
5
4
6+8
20
7
IBM PC/AT
DB-9P
1
2
3
5
6+8