Hi Guys,
I am going to post an Arduino sketch to a public google drive and I will export some tags from Ignition. This example is not a Modbus TCP example. What I threw together was Modbus RTU or Serial. This Arduino sketch is communicating over its USB as a Comm Port to Ignition. I just took pre-existing components and made them work together.
-Download the Serial Gateway Module from Ignition, this gives you the Modbus RTU driver
-Download this guy’s Modbus Library https://github.com/andresarmento/modbus-arduino