Modbus Server(Slave) Serial Protocol(RTU and Ascii)

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File:TArduinoModbusServerSerial.png

Summary

Handles Modbus Serial communication (RTU and ASCII) for a Modbus Server (Slave).

Description

The **Modbus Server (Slave) Serial Protocol** component enables a device to function as a Modbus Slave over a serial connection. It supports both **RTU** (binary) and **ASCII** formats for compatibility with a wide range of Modbus Master devices.

This component processes serial Modbus frames, validates packets, and outputs decoded Modbus messages for handling by a Modbus Device. It is ideal for embedded and industrial systems that need to act as Modbus Slaves communicating with PLCs, controllers, or HMIs.

Diagram:

Categories

Properties

  • Ascii Format (boolean) – Enables ASCII mode (when disabled, RTU mode is used).
  • Input Buffer Size Limit – Maximum size of the receive buffer (default: 1024).
  • Packet Detect Interval (mS) – Timeout window for detecting complete Modbus packets (default: 100).

Pins

Input Pins

  • In – Serial input data stream.

Output Pins

  • Out – Serial output data stream.
  • Modbus – Decoded Modbus request/response stream for use with a Modbus Device.
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