Ibm Pc/Xt, Pc/At, And Compatible Computers - QMS 1725E Reference

IBM PC/XT, PC/AT, and Compatible
Computers
This diagram gives the suggested cable pinouts for IBM PC/XT, PC/
AT, and compatible computers
» Note: Not all serial cables are configured as shown and may require an additional
null-modem adapter. Check with your cable vendor for compatibility.
Printer
end of
cable
9-Pin
RXD
TXD
DTR
DSR
GND
RTS
CTS
» Note: To download printer system software via the serial port, your hardware must
have RTS and CTS support. Make sure that pins 4 and 5 on the 25-pin serial cable
and pins 7 and 8 on the 9-pin serial cable are criss-crossed as shown in this
diagram.
B-10
CPU XT
end of
cable
25-Pin F
1 Not Used
2 2
3 3
4 20
6 6
5 7
7 4
8 5
9 Not Used
QMS 1725E Print System Reference
Printer
end of
cable
9-Pin
RXD RXD
TXD TXD
DTR DTR
DSR DSR
GND GND
RTS RTS
CTS CTS
CPU AT
end of
cable
9-Pin F
1 Not Used
2 2
3 3
4 4
6 6
5 5
7 7
8 8
9 Not Used
RXD
TXD
DTR
DSR
GND
RTS
CTS