rtu-pjc

Nifty Modbus: RTU (PureJavaComm)

This project adds Modbus RTU (serial, RS-485, etc.) protocol support to Nifty Modbus, using the PureJavaComm library to provide native serial port access.

Example use

Here is an example of using the Nifty Modbus RTU client to read some Modbus registers:

// configure the serial port settings
BasicSerialParameters params = new BasicSerialParameters();
params.setBaudRate(9600);
NettyRtuModbusClientConfig config = new NettyRtuModbusClientConfig("/dev/ttyUSB0", params);

// create the client, passing in the PJC SerialPortProvider
ModbusClient client = new RtuNettyModbusClient(config, new PjcSerialPortProvider());

try {
	// open the serial port
	client.start().get();

	// request the first 10 holding register values
	RegistersModbusMessage req = RegistersModbusMessage.readRegistersRequest(
		ModbusBlockType.Holding, 1, 0, 10);
	RegistersModbusMessage res = client.send(req).unwrap(RegistersModbusMessage.class);

	// print out the results
	short[] data = res.dataDecode();
	for ( int i = 0, len = data.length; i < len; i++ ) {
		System.out.printf("%d: 0x%04X\n", addr + i, data[i]);
	}
} finally {
	// close the serial port
	client.stop();
}