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Appendix A: DB9 DCE Pin Assignment
Appendix A. DB9 DCE Pin Assignment.
Pin Number Name RS-232 Signal Name
1 DCD Data Carrier Detect
2 RxD Received Data
3 TxD Transmit Data
4 — Not connected
5 GND Signal Ground
6 DSR Data Set Ready
7 — Not connected
8 CTS Clear to Send
9 — Not connected