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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



  #http://www.tahapaksu.com/crc/

  #https://www.lammertbies.nl/comm/info/crc-calculation.html

  test "wrap test" do

    p  0xFFFF, <<>>

    p  0x40BF, <<0>>

    p  0x70C0, <<0,1>>

    p  0x91F1, <<0,1,2>>

    p  0x8510, <<0,1,2,3>>

  end



  defp p(crc, payload) do

    assert <<payload::binary, crc::16>> == payload |> Rtu.wrap

    assert payload == <<payload::binary, crc::16>> |> Rtu.unwrap

  end



end