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14. Modbus

Last modified by writer on 2025/07/15 19:25

Modbus RTU communication is supported at the hardware level on the following devices:

  • PX1;
  • PLCM-E3 + PLCM-B1-G2.

When using other controllers that do not support the Modbus RTU protocol, communication is configured by connecting to a PC via a USB-RS485 converter, for example, via PLB485.

When working via Modbus RTU, PUMOTIX acts as a Master device, and all connected devices must be in Slave mode.

Supported functions:

  • Read - 0x03 (Read Holding Registers);
  • Read - 0x04 (Read Input Registers);
  • Write - 0x06 (Write Single Register);
  • Write - 0x10 (Write Multiply Registers).

Connection and configuration examples for some frequency converters: