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Appendix A: Interface Specifications
RS232 Serial
The RS232 connector on the printer is a DB9F:
Pin Direction
Definition
1 / /
2 Out TX
3 In RX
4 In CTS
5 - Ground
6 Out RTS
7 In DSR
8 Out DTR
9 / /
Connection with host:
Host 25S
Printer 9P
Host 9S
Printer 9P
TX 2
……… 3 RX
RX 2
……… 2 TX
RX 3
……… 2 TX
TX 3
……… 3 RX
DSR 6
……… 8 DTR
DTR 4
……… 7 DSR
DTR 20
……… 7 DSR
DSR 6
……… 8 DTR
RTS 4
……… 4 CTS
RTS 7
……… 4 CTS
CTS 5
……… 6 RTS
CTS 8
……… 6 RTS
GND 7
……… 5 GND
GND 5
……… 5 GND
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