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RModBus - free implementation of ModBus protocol in pure Ruby
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README.md

RModBus Build Status

RModBus - free implementation of protocol ModBus.

Features

  • Ruby 1.8, Ruby 1.9, JRuby (without serial ModBus RTU)
  • TCP, RTU, RTU over TCP protocols
  • Client(master) and server(slave)
  • 16, 32 -bit and float registers

Support functions

  • Read Coils (0x01)
  • Read Discrete Inputs (0x02)
  • Read Holding Registers (0x03)
  • Read Input Registers (0x04)
  • Write Single Coil (0x05)
  • Write Single Register (0x06)
  • Write Multiple Coils (0x0F)
  • Write Multiple registers (0x10)
  • Mask Write register (0x16)

Installation

Download and install RModBus with the following

$ gem install rmodbus

Example

    require 'rmodbus'

    ModBus::TCPClient.new('127.0.0.1', 8502) do |cl|
      cl.with_slave(1) do |slave|
        # Read a single holding register at address 16
        slave.holding_registers[16]

        # Write a single holding register at address 16
        slave.holding_registers[16] = 123

        # Read holding registers 16 through 20
        slave.holding_registers[16..20]

        # Write holding registers 16 through 20 with some values
        slave.holding_registers[16..20] = [1, 2, 3, 4, 5]
      end
    end

GitHub

You can checkout source code from GitHub repositry

$ git clone git://github.com/flipback/RModBus.git

Reference

Home page: http://rmodbus.flipback.net

RModBud on GitHub: http://github.com/flipback/RModBus

ModBus community: http://www.modbus-ida.org

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