STC6000-MM01-EN.02

Serial Interface

Precautions for Connecting Serial Interface

The serial interface is not isolated.

NOTE: For information on how to connect controllers and other types of equipment, refer to the corresponding device driver manual of your screen editing software.

You can switch the communication method between RS-232C and RS-422/RS-485 via the software.

The SG (signal ground) and FG (frame ground) terminals are connected inside the product. When the serial interface connector is D-Sub, connect the FG wire to the shell.

DANGER
ELECTRIC SHOCK AND FIRE
When using the SG terminal to connect an external device to this product:
  • Verify that a ground loop is not created when you set up the system.
  • Connect the SG terminal to remote equipment when the external device is not isolated.
  • Connect the SG terminal to a known reliable ground connection to reduce the risk of damaging the circuit.
Failure to follow these instructions will result in death or serious injury.
CAUTION
LOSS OF COMMUNICATION
  • Do not put excessive stress on the communication ports of all connections.
  • Securely attach communication cables to the panel wall or cabinet.
  • Use a D-Sub 9 pin connector that has jack screws.
Failure to follow these instructions can result in injury or equipment damage.
NOTE: Use within the rated current.

Serial Interface Connector RS-232C

D-Sub 9 pin plug connector

Product side:

Pin No.

RS-232C

Signal name

Direction

Meaning

1

CD

Input

Carrier detect

2

RD (RXD)

Input

Receive data

3

SD (TXD)

Output

Send data

4

ER (DTR)

Output

Data terminal ready

5

SG

Signal ground

6

DR (DSR)

Input

Data set ready

7

RS (RTS)

Output

Request to send

8

CS (CTS)

Input

Send possible

9

VCC

Output

+5 Vdc ±5% Output 0.25 A*1

Shell

FG

Frame ground (common with SG)

*1 When using RS-232C pin #9, enable VCC with the software.

Recommended jack screw is #4-40 (UNC).

Recommendations:

  • Cable Connector: XM3D-0921 manufactured by OMRON Corporation.

  • Cable Cover: XM2S-0913 manufactured by OMRON Corporation.

  • Jack Screw (#4-40 UNC): XM2Z-0073 manufactured by OMRON Corporation.

Serial Interface Connector RS-422/485

D-Sub 9 pin plug connector

Product side:

Pin No.

RS-422/RS-485

Signal name

Direction

Meaning

1

RDA

Input

Receive data A (+)

2

RDB

Input

Receive data B (-)

3

SDA

Output

Send data A (+)

4

ERA

Output

Data terminal ready A (+)

5

SG

Signal ground

6

CSB

Input

Send possible B (-)

7

SDB

Output

Send data B (-)

8

CSA

Input

Send possible A (+)

9

ERB

Output

Data terminal ready B (-)

Shell

FG

Frame ground (common with SG)

Recommended jack screw is #4-40 (UNC).

Recommendations:

  • Cable Connector: XM3D-0921 manufactured by OMRON Corporation.

  • Cable Cover: XM2S-0913 manufactured by OMRON Corporation.

  • Jack Screw (#4-40 UNC): XM2Z-0073 manufactured by OMRON Corporation.

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