Control RS232C devices from PLC via Ethernet communication

To control RS232C-equipped devices with a PLC, a serial communication unit is required, and there are some limitations such as one-to-one communication to the port, and the communication distance is usually less than 15m.

The RS232C-Ethernet converter enables 1-to-n communication with multiple RS232C-equipped devices at a distance of 100m from the PLC's built-in Ethernet port via a switching hub.

Normal control configuration for RS232C devices
Control configuration of RS232C devices by Ethernet communication

Control RS232C devices in remote locations

Ethernet communication allows PLCs to control RS232C-equipped devices such as barcode readers, printers, scales, and temperature controllers in remote locations.

No need for RS232C serial communication unit

The built-in Ethernet of the PLC can be used, eliminating the need for a serial communication unit. Although an RS232C-Ethernet converter is required for each device, it is less expensive than a serial communication unit, so the more devices you control, the more cost effective it becomes.

Need to replace with a program for Ethernet communication

When changing the serial communication of existing equipment to Ethernet communication, the program of the communication part cannot be used as it is. The PLC side requires a program to send/receive commands over Ethernet, so please consult with us when replacing with Ethernet communication.

Ethernet-RS232C control test

【Test Method】

  1. Connect the PLC and RS232C-Ethernet converter with Ethernet cable.
  2. Connect the converter and PC with RS232C cable.
  3. Send a command from the PLC and confirm that the PC receives the command.

【Test equipment configuration】
・PLC: Q03UDECPU (with Ethernet port)
・PC side software: Rs232cTool

【Test Video】