Omron NT31 NT31C manual Pin Arrangement, RS-422A/485 Terminal Block, RS-232C Connector

Using an RS-232C/RS-422A Convertor Unit Appendix C

Pin Arrangement

The convertor unit has a terminal block for an RS-422A/485 interface connection and a connector for an RS-232C interface connection.

The pin arrangements for the RS-422A/485 terminal block and the RS-232C connector are as follows.

RS-422A/485 Terminal Block

7

5

3

1

	Terminal			Signal direction
	block pin	Signal name	Abbreviation	(convertor unit ⇔ RS-422
8	No.			device)
	8	Request to send (−)	CSA	→
6
	7	Request to send (+)	CSB	→
4
	6	Receive data (−)	RDA	←
2
	5	Receive data (+)	RDB	←
	4	Send data (−)	SDA	→
	3	Send data (+)	SDB	→
	2	Signal ground	SG (GND)	–
	1	Functional ground		–

* The CSB and CSA signals are for specialized applications.

RS-232C Connector

		Connector			Signal direction
			Signal name	Abbreviation	(convertor unit ⇔ RS-232C
		pin No.
					device)
1
	6	1	Not used	–	–
2
	7
		2	Send data	SD	←
3
	8
		3	Receive data	RD	→
4
	9
5		4	Request to send	RS	←
			(shorted to CS internally)
		5	Clear to send	CS	→
			(shorted to RS internally)
		6	+5 V (150 mA) input for convertor	+5 V	→
			unit
		7	Data set ready	DR	→
			(shorted to ER internally)
		8	Data terminal ready	ER	←
			(shorted to DR internally)
		9	Signal ground	SG	–

* The hood is connected to the functional ground terminal of the RS-422A terminal block.

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