Hi, @J-Hilk!

Looks like i found desired method in QModbusDataUnit class docs. Don't know how i missed it being mentioned in List of All Members for QModbusRtuSerialMaster. I guess digging into Qt docs about Modbus was a proper way to solve this :)

QModbusDataUnit::QModbusDataUnit(QModbusDataUnit::RegisterType type, int address, const QVector<quint16> &data)

In my case this will be:

QModbusDataUnit input(QModbusDataUnit::InputRegisters, 3001, data);

Thanks for joining my journey!