I have a couple difference recording devices. A Honeywell EZTrend QXe and a LogicBeach IL-80
Using the Ignition UA OPC server,I am able to connect and read the correct data using modbus TCP to the Honeywell unit.
However on the Logicbeach unit, I get a Bad_InvalidArgument error in the Quality column.
Using Matrikon OPC I am able to read the data through modbus TCP on both units.
Modscan32 and SimplyModbus also work on both units.