Wiring(CM3 Serial)

Owned by CIMON (Unlicensed)
May 03, 2023
2 min read

▶  Null Modem Wiring

DSUB

Connection

DSUB

Pin

Pin

1

 

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

 

DSUB 9Pin Female

 

Pin

Contents

Name

1

Carrier Detect

1

2

Received Data

2

3

Transmitted Data

3

4

Data Terminal Ready

4

5

Signal Ground

5

6

Data Set Ready

6

7

Request to Send

7

8

Clear to Send

8

9

Ring Indicator

9

 

 

 

▶  Modem Wiring (Leased line modem, CDMA Modem)

  • Connect each pin 1:1 directly

  • CDMA Modem Wiring

 

DSUB

Connection

DSUB

9-Pin

Name

Name

25-Pin

1

CD

 

CD

8

2

RXD

RXD

3

3

TXD

TXD

2

4

DTR

DTR

20

5

SG

SG

7

6

DSR

DSR

6

7

RTS

RTS

4

8

CTS

CTS

5

9

RI

RI

22

※ If CDMA modem has 9-pin connector, please check the pin number both modem and PLC before wiring.

 

 

 

▶  RS422 Wiring

The first 2 modules are connected cross TX to RX and other stations are connected TX to
TX and RX to RX.

 

▶  RS-485 Wiring

Connect SDA to RDA and SDB to RDB and connect to other PLCs.