Serial connector pinout

The Connect EZ has an RJ45 (10 pin) serial connector. The table below contains the pinout information.

Altpin

If you enable Altpin in EIA-232 mode, the DCD and DSR signals are swapped. This allows use of DCD with 8-wire cables. Altpin has no impact on 422 or 485 mode.

Data+/Data- pins (in RS 485 half duplex mode)

For RS 485 cables in half duplex mode, you only need to connect one each of the Data+ and Data- pins.

			MEI models only	MEI models only
10-pin	8-pin	EIA-232 Signals (DTE)	EIA-422/485 Full-duplex	EIA-485 Half-duplex
1		RI	TxD-	Data-
2	1	DSR (DCD*) *When Altpin is enabled	RxD-	Data-
3	2	RTS	RTS+	N/A
4	3	GND	GND	GND
5	4	TxD	TxD+	Data+
6	5	RxD	RxD+	Data+
7	6	SG	SG	SG
8	7	CTS	CTS+	N/A
9	8	DTR	RTS-	N/A
10		DCD (DSR*) *When Altpin is enabled	CTS-	N/A