Example RModBus

example_rmodbus.rb

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