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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
1
Not Used
RXD
2
TXD
3
DTR
4
DSR
6
GND
5
RTS
7
CTS
8
9
Not Used
To CPU XT
25-Pin
2
RXD
3
TXD
20
DTR
6
DSR
7
GND
4
RTS
5
CTS
To Printer
9-Pin
1
Not Used
RXD
2
TXD
3
DTR
4
DSR
6
GND
5
RTS
7
CTS
8
9
Not Used
To CPU AT
9-Pin
2
RXD
3
TXD
4
DTR
6
DSR
5
GND
7
RTS
8
CTS
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