Omron NT31 NT31C manual Reference Connecting between NT31/NT31C Units

Connecting to the Host’s RS-422A/485 Port Section 5-2

Reference:

Connecting between NT31/NT31C Units

SCommunication using the RS-422A type standard NT link (1:N) method is possible only when a CS1W-SCB41 Serial Communications Board is installed in a CS1 series CS1G/H, a Communications Board is installed in a C200HX/ HG/HE(-Z)E, or a CQM1H-SCB41 Serial Communications Board is installed in a CQM1H.

SCommunication using the RS-422A type high-speedNT link (1:N) method is possible only when a CS1W-SCB41 Serial Communications Board is installed in a CS1 series CS1G/H.

The relay terminal block is not included in this figure. Insert the relay terminal block so as to achieve the wiring configuration shown below.

NT31/NT31C Host

RS-422A

:

114

1325

NT31/NT31C side

	Abbreviation	Pin number
	FG	Connector
		hood
RS-232C/	−	1
422A/485	SD	2
connector	RD	3
	RS	4
	CS	5
	−	6
	SG	7
	−	8
	TRM	9
	RDB (+)	10
	RDB (+)	11
	−	12
	−	13
	−	14
	SDA (−)	15
	RDA (−)	16
	−
	−	−
	RSB (+)	23
	RSA (−)	24
	−	25

(25-pin type)

Shielding wire

:

NT31/NT31C side

Pin number Abbreviation

Connector

hood FG

1−

		RS-232C/
2	SD
		422A/485
3	RD	connector

4RS

5CS

6−

7SG

8−

9TRM

10RDB (+)

11RDB (+)

12−

13−

14−

15SDA (−)

16RDA (−)

−	−
	−

23RSB (+)

24RSA (−)

25−

(25-pin type)

114

1325

*2

Make the connection between pin numbers 9 and 10 at the NT31/NT31C at the end of the RS-422A cable (marked : in the figure above) only.

In order to avoid an FG ground loop, connect the functional ground of only one of the NT31/NT31C units to the shielding of the RS-422A cable.

Connecting an NT31/NT31C and a Host

NT31/NT31C Host

RS-422A

123