Technical information

This diagram gives the suggested cable pinouts for IBM PC/XT, PC/
AT, and compatible computers
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