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modbus

0.3.0

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Modbus library with TCP Master & Slave implementation.

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modbus lib rtu.ex

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lib/rtu.ex

defmodule Modbus.Rtu do
  alias Modbus.Helper
  @moduledoc false

  def wrap(payload) do
    crc = Helper.crc(payload)
    <<payload::binary, crc::16>>
  end

  def unwrap(data) do
    size = :erlang.byte_size(data)-2
    <<payload::binary-size(size), crc::16>> = data
    ^crc = Helper.crc(payload)
    payload
  end

end

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