Postek C168 - Appendix A: Interface Specifications; RS232 Serial Interface

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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