J2Mod - I/O 异常 - 读取失败

Question

我正在为我的项目使用 J2Mod java jar。我通过 comport 与设备连接，但既不能读取数据也不能将数据写入设备。两次当我试图将数据读取或写入设备时都出现相同的异常。无论何时，使用 QModMaster 我都能够从设备读取数据。

连接代码-

SerialParameters parameters;
SerialConnection serialMaster;

try {
        parameters = new SerialParameters();

        parameters.setPortName((String) jComboBox4.getSelectedItem());
        //parameters.setCommPortId("/dev/ttyUSB1");
        parameters.setBaudRate(9600);
        parameters.setDatabits(8);
        parameters.setStopbits(1);
        parameters.setParity("none");
        // parameters.setEncoding("rtu");
        // parameters.setEcho(false);
        System.out.println("Connection Section" + parameters);
        serialMaster = new SerialConnection(parameters);

        serialMaster.open();
        System.out.println("Connection open :" + serialMaster.isOpen());

    } catch (Exception ex) {
        Logger.getLogger(TankIQ_Configurator.class.getName()).log(Level.SEVERE, null, ex);
    }

读取数据的代码-

ReadMultipleRegistersRequest readMultipleRegistersRequest;
ReadMultipleRegistersResponse readMultipleRegistersResponse;
ModbusSerialTransaction trans;    

trans = new ModbusSerialTransaction(serialMaster);

Register[] register = {simpleRegister1, simpleRegister2};

int unitid = 1; //the unit identifier we will be talking to
int ref = 50; //the reference, where to start reading from
int count = 2; //the count of IR's to read
int repeat = 1; //a loop for repeating the transaction

//4. Open the connection
try{
    //5. Prepare a request
    readMultipleRegistersRequest = new ReadMultipleRegistersRequest(50, 2);
    readMultipleRegistersRequest.setUnitID(unitid);
    readMultipleRegistersRequest.setHeadless();

    //6. Prepare a transaction
    trans = new ModbusSerialTransaction(serialMaster);
    trans.setRequest(readMultipleRegistersRequest);

    int k = 0;
    do {
        trans.setTransDelayMS(1000);
        trans.execute();
        readMultipleRegistersResponse = (ReadMultipleRegistersResponse) trans.getResponse();
        for (int n = 0; n < readMultipleRegistersResponse.getWordCount(); n++) {
            System.out.println("Word " + n + "=" + readMultipleRegistersResponse.getRegisterValue(n));
        }
        k++;
    } while (k < repeat);
    serialMaster.close();//8. Close the connection
} catch (Exception ex) {
    Logger.getLogger(WriteMultipleRegistersRequest.class.getName()).log(Level.SEVERE, null, ex);
}

Answer 1

谢谢！所有参与本题的人。

现在，让我解释一下为什么会出现此错误。

除了 unitid 之外，所有代码都很好。 unitid 只是从属地址而已。在我的例子中，从地址是 5.

J2Mod - I/O 异常 - 读取失败

J2Mod - I/O exception - failed to read

java

exception

modbus

modbus-tcp