Always Get ReadTimeOut Error When Reading From Real Device.

[coderkan]

Hi everyone,

First of all, thanks for this good library. I have a problem when using it in a real device.

I have a modbus device and a modbus usb converter to test it. I have successfully connected with ModbusPool GUI and get data successfully.

My Configuration is like below;

BaudRate: 9600
DataBits : 8
Parity: SerialPort.Parity.EVEN
StopBits: 1

My Sample Code like below;

This is a sample code, I always get ReadTimeOut error. I have no success when I try to read from a real device, ModBus Pool read successfully from the device. Have you got any ideas about that problem?

Regards Erkan

		SerialUtils.setSerialPortFactory(new SerialPortFactoryPJC());
		SerialParameters sp = new SerialParameters();
		Modbus.setLogLevel(Modbus.LogLevel.LEVEL_DEBUG);
		try {
			String[] dev_list = SerialPortList.getPortNames();
			if (dev_list.length > 0) {
				sp.setDevice(dev_list[0]);
				sp.setBaudRate(SerialPort.BaudRate.BAUD_RATE_9600);
				sp.setDataBits(8);
				sp.setParity(SerialPort.Parity.EVEN);
				sp.setStopBits(1);

				ModbusMaster m = ModbusMasterFactory.createModbusMasterRTU(sp);
				m.connect();

				int slaveId = 1;
				int offset = 0;
				int quantity = 10;
				try {
					int[] registerValues = m.readHoldingRegisters(slaveId, offset, quantity);
					// print values
					for (int value : registerValues) {
						System.out.println("Address: " + offset++ + ", Value: " + value);
					}
				} catch (RuntimeException e) {
					throw e;
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		} catch (RuntimeException e) {
			throw e;
		} catch (Exception e) {
			e.printStackTrace();
		}

[dotsha747]

Are you sure dev_list[0] contains the name of the serial port your device is connected to? Maybe print it out and confirm. There may be more than one serial device.