
UNO-2174A/2178A User Manual 32
A.4 RS-232/485 Serial Port (COM3-COM6)
This function is enabled through expansion cable (UNO-2178A only).
Table A.4: RS-232/485 Serial Port Pin Assignments
Pin RS-232 Signal Name RS-485 Signal Name
1NC Data-
2 RxD Data+
3TxD NC
4NC NC
5GND GND
6NC NC
7RTS NC
8CTS NC
9NC NC
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