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

Section 5-2

Connecting between NT31/NT31C Units

NT31/NT31C

Host

 

RS-485

:

NT31/NT31C side

NT31/NT31C side

114

1325

RS-232C/

422A/485

connector

Abbreviation Pin number

FG

Connector

hood

 

1

SD

2

RD

3

RS

4

 

 

CS

5

6

SG

7

8

TRM 9

RDB (+)

10

SDB (+)

11

 

 

12

 

 

13

14

 

 

SDA ()

15

 

 

RDA ()

16

 

 

 

 

 

 

 

RSB (+)

23

 

 

RSA ()

24

25

Shielding wire

:

Pin number Abbreviation

Connector

hood FG

1

2SD

3RD

4RS

5CS

6

7SG

8

9TRM

10

RDB (+)

11

SDB (+)

12

13

14

15

SDA ()

16RDA ()

23RSB (+)

24RSA ()

25

RS-232C/ 422A/485 connector

114

1325

(25-pin type)

(25-pin type)

Next PT

*2

Make the connection between pin numbers 9 and 10 at the NT31/NT31C at the end of the RS-485 cable (marked : in the figure above) only.

Connecting an NT31/NT31C and a Host

In order to avoid an FG ground loop, do not connect the functional ground of the NT31/NT31C to the shielding of the RS-422A cable.

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-485

Wiring When Connecting a CS1-series CS1G/H Serial Communication Board, C Series C200HX/HG/HE(-Z)E Communication Board, or CQM1H Serial Communications Board

Applicable units:

CS1G-CPU42-E(V1) CS1G-CPU43-E(V1)

CS1G-CPU44-E(V1) CS1G-CPU45-E(V1)

CS1H-CPU63-E(V1) CS1H-CPU64-E(V1)

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Omron NT31 NT31C manual 126