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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 -