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This diagram gives the suggested cable pinouts for IBM PC/XT, PC/
AT, and compatible computers
Not all serial cables are configured as shown and may require an
additional null-modem adapter. Check with your cable vendor for
compatibility. 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.
To Printer
9-Pin
To CPU XT
25-Pin
To Printer
9-Pin
To CPU AT
9-Pin
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