Member alicat_basis2::kInterFrameDelayMs: Never used by the driver. The inter-frame gap is computed from the bus baud rate: modbus::InterFrameGapUs(), Driver::SetBusBaudRate().
Member alicat_basis2::reg::MeasurementPrevAvgFlowLow: Misnamed: 4214 is the high register of the 32-bit value. Use MeasurementPrevAvgFlow; the low register is 4215.