B&B Electronics UNO-2170 RS-232/422/485 Serial Port COM3~COM4, Ethernet RJ-45 Connector LAN1~LAN2

A.4 RS-232/422/485 Serial Port (COM3~COM4)

Table A.5: RS-232/422/485 serial port pin assignments

Pin	RS-232	RS-422	RS-485
1	DCD	Tx-	DATA-
2	RxD	Tx+	DATA+
3	TxD	Rx+	NC
4	DTR	Rx-	NC
5	GND	GND	GND
6	DSR	NC	NC
7	RTS	NC	NC
8	CTS	NC	NC
9	RI	NC	NC

A.5 Ethernet RJ-45 Connector (LAN1~LAN2)

Table A.6: Table A-5: Ethernet RJ-45 connector pin assignments

Pin 10/100Base-T Signal Name

1XMT+

2XMT-

3RCV+

4NC

5NC

6RCV-

7NC

8NC

27 AppendixA