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Good Day, I'm using Cimplicity as my HMI to a control system that uses ModbusTCP as the network protocol. Initially I tested it using Kepware's OPC server (works really well). I recommend that my customers buy the OPC server but some customers have already set up their system using the driver supplied with Cimplicity. Using the driver in the "non-quantum" mode the data transfer works fine but I can't limit the block size requests. My Modbus "slave" device can only handle block sizes under 64 bytes. Has anyone hit/solved this problem? brendan