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27 Appendix A
A.3 RS-232 Standard Serial Port (COM1~COM2)
Table A.4: RS-232 standard serial port pin assignments
Pin RS-232 Signal Name
1DCD
2RxD
3TxD
4DTR
5GND
6DSR
7RTS
8CTS
9RI
Advantech UNO 2173A/AF Computer Hardware User Manual
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