QMS 1725E, Reference

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Cable Pinouts
QMS 1725E Print System Reference B-10
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.
» 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.
Printer
end of
cable
9-Pin
CPU XT
end of
cable
25-Pin F
Printer
end of
cable
9-Pin
CPU AT
end of
cable
9-Pin F
1 Not Used 1 Not Used
RXD 2 2 RXD RXD 2 2 RXD
TXD 3 3 TXD TXD 3 3 TXD
DTR 4 20 DTR DTR 4 4 DTR
DSR 6 6 DSR DSR 6 6 DSR
GND 5 7 GND GND 5 5 GND
RTS 7 4 RTS RTS 7 7 RTS
CTS 8 5 CTS CTS 8 8 CTS
9 Not Used 9 Not Used