Omron manual Connection between NT631/NT631C Units RS- 422A

Connecting to the Host’s RS-232C Port Section 5-1

Connection between NT631/NT631C Units (RS- 422A)

The relay terminal board is not included in the figure below. Insert a relay ter- minal board so as to achieve the wiring configuration indicated below.

NT631/NT631C NT-AL001 Host

RS-422A
:
RDA	NT631/NT631C side			NT631/NT631C side		RDA
TRM		Abbreviation	Short-circuit tool	Abbreviation		TRM
		RDA (-)	:	RDA (-)
RDB	RS-422A/	TRM		TRM RS-422A/		RDB
		RDB (+)		RDB (+)	485
SDA	485				terminal	SDA
	terminal	SDA (-)		SDA (-)	block
	block
SDB						SDB
		SDB (+)		SDB (+)
RSA		RSA (-)		RSA (-)		RSA
		RSB (+)		RSB (+)
RSB		Functional	Shielding	Functional		RSB
		ground		ground
			wire
24V						24V
+DC						+DC

*Short TRM and RDA terminals of the NT631/NT631C at the end of the RS- 422A cable (* marked in the above figure) using the short-circuit tool sup- plied with the NT631/NT631C.

For details on handling shield wires, refer to 5-2-8 Handling the Shield on RS- 422A/485 Cables on page 125.

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