this gives null pointer exception when i use lib 1.2.9 but it works fine when i use 1.2.8.4, about jlibmodbus

[SanduDS]

please tell me what I got wrong. and power meter (SMD 220 eastron )gives me integer register values but I couldn't convert it to real values. I m new to Modbus

[kochedykov]

Hi! JLibmodbus supports several uart connectors like jssc, rxtx, jserialcomm etc. Before you create a master you should set SerialPortFactory, for instance jssc:
SerialUtils.setSerialPortFactory(new SerialPortFactoryJSSC());
If you need to read float values you can use the code below:

        ReadHoldingRegistersRequest request = new ReadHoldingRegistersRequest();
        //Or ReadInputRegistersRequest request = new ReadInputRegistersRequest();
        request.setServerAddress(slaveId);
        request.setStartAddress(offset);
        request.setQuantity(2);
        ReadHoldingRegistersResponse response = (ReadHoldingRegistersResponse) 
        request.getResponse();

        master.processRequest(request);
        ModbusHoldingRegisters registers = response.getHoldingRegisters();
        registers.getFloat32At(0);