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modbus

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Modbus library with TCP Master & Slave implementation.

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modbus test rtu_test.exs
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test/rtu_test.exs 

defmodule RtuTest do

  use ExUnit.Case

  alias Modbus.Rtu



  test "wrap test" do

    p(<<0xCB, 0x4F>>, <<0x01, 0x05, 0x0B, 0xB8, 0x00, 0x00>>)

    p(<<0x3B, 0x0E>>, <<0x01, 0x05, 0x0B, 0xB8, 0xFF, 0x00>>)

    p(<<0xCB, 0x7F>>, <<0x01, 0x01, 0x0B, 0xB8, 0x00, 0x01>>)

    p(<<0x88, 0x51>>, <<0x01, 0x01, 0x01, 0x00>>)

  end



  defp p(<<crc_hi, crc_lo>>, payload) do

    assert <<payload::binary, crc_lo, crc_hi>> == payload |> Rtu.wrap()

    assert payload == <<payload::binary, crc_lo, crc_hi>> |> Rtu.unwrap()

  end

end