# h5.modbus

Implementation of the MODBUS IP/ASCII/RTU master and slave over TCP/UDP/Serial/WebSocket for Node.js.

TODO

• Remaining messages
• Tests
• Documentation
• npm publish

Requirements

• Node.js >= v8
• voodootikigod/node-serialport >= v6 (only for serial port communication).
• websockets/ws >= v1 (only for WebSocket communication).

Installation

npm install github:morkai/h5.modbus#master

Usage

'use strict';

const modbus = require('h5.modbus');

const slave = modbus.createSlave({requestHandler: handleRequest});
const master = modbus.createMaster();

master.once('open', () => master.readHoldingRegisters(0x0000, 10, handleResponse));

function handleRequest(unit, request, respond)
{
  respond(modbus.ExceptionCode.IllegalFunctionCode);
}

function handleResponse(err, res)
{
  if (err)
  {
    console.error(`[master#error] ${err.message}`);
  }
  else if (res.isException())
  {
    console.log(`[master#exception] ${res}`);
  }
  else
  {
    console.log(`[master#response] ${res}`);
  }
}

License

This project is released under the MIT License.