User guide

Appendix A: Pin Definition of RS232 DB9 Male
RS232-A for POS/Cash Register (Half-duplex)
Pin Definition
1-
2RX
3-
4-
5 GND
6 -
7-
8-
9 -
RS232-B for DVR (Full-duplex)
Pin Definition
1 -
2RX
3 TX
4 -
5 GND
6 -
7 RTS
8 CTS
9 -