Snapex7.Client.read_szl

You're seeing just the function read_szl, go back to Snapex7.Client module for more information.
Link to this function

read_szl(pid, id, index)

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Specs

read_szl(GenServer.server(), integer(), integer()) ::
  {:ok, bitstring()} | {:error, map()} | {:error, :einval}

Reads a partial list of given ID and INDEX See System Software for S7-300/400 System and Standard Functions Volume 1 and Volume 2 for ID and INDEX info (chapter 13.3), look for TIA Portal Information Systems for DR data type.