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

Section 5-2

CVM1/CV-series CPUs whose model names do not have the suffix -EVjcan- not be connected by any connection method.

114

1325

NT31/NT31C side

 

Abbreviation

Pin number

 

FG

Connector

 

hood

 

 

 

1

 

 

 

RS-232C/

SD

2

422A/485

 

 

RD

3

connector

 

 

RS

4

 

 

 

 

 

CS

5

 

 

 

 

6

 

 

 

 

SG

7

 

 

 

 

8

 

 

 

 

TRM

9

 

 

 

 

RDB (+)

10

 

 

 

 

SDB (+)

11

 

 

 

 

12

 

 

 

 

13

 

 

 

 

14

 

 

 

 

SDA ()

15

 

RDA ()

16

 

 

 

 

 

16

 

PC (CPU) side

 

Pin number Abbreviation

 

 

Connector

FG

 

 

hood

 

 

 

 

 

 

 

1

 

SDA

RS-422A

 

 

 

 

 

2

 

SDB

connector

9

3

 

5

 

 

4RS

5CS

6RDA

7

8RDB

9

 

 

RSB (+)

23

 

 

RSA ()

24

 

 

25

(25-pin type)

Shielding wire

(9-pin type)

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.

Wiring for a Memory Link Connection

Prepare the adapter cable while referring to the following diagram.

114

1325

NT31/NT31C side

 

Abbreviation

Pin number

 

 

 

 

FG

Connector

 

hood

 

 

 

1

 

 

 

RS-232C/

SD

2

422A/485

 

 

RD

3

connector

 

 

 

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

(25-pin type)

Host side

Abbreviation

Connector

hood

SDA

RS-422A

SDB connector

RS

CS

ROA

ROB

Shielding wire

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.

120

Page 131
Image 131
Omron NT31 NT31C manual 120