Example #1
0
  public String openPort(String portName, String appName) {
    // open the port, check ability to set moderators
    try {
      // get and open the primary port
      CommPortIdentifier portID = CommPortIdentifier.getPortIdentifier(portName);
      try {
        activeSerialPort = (SerialPort) portID.open(appName, 2000); // name of program, msec to wait
      } catch (PortInUseException p) {
        return handlePortBusy(p, portName, log);
      }

      // try to set it for communication via SerialDriver
      try {
        activeSerialPort.setSerialPortParams(
            9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
      } catch (gnu.io.UnsupportedCommOperationException e) {
        log.error("Cannot set serial parameters on port " + portName + ": " + e.getMessage());
        return "Cannot set serial parameters on port " + portName + ": " + e.getMessage();
      }

      // set RTS high, DTR high
      activeSerialPort.setRTS(true); // not connected in some serial ports and adapters
      activeSerialPort.setDTR(true); // pin 1 in DIN8; on main connector, this is DTR

      // disable flow control; hardware lines used for signaling, XON/XOFF might appear in data
      activeSerialPort.setFlowControlMode(0);
      activeSerialPort.enableReceiveTimeout(50); // 50 mSec timeout before sending chars

      // set timeout
      // activeSerialPort.enableReceiveTimeout(1000);
      log.debug(
          "Serial timeout was observed as: "
              + activeSerialPort.getReceiveTimeout()
              + " "
              + activeSerialPort.isReceiveTimeoutEnabled());

      // get and save stream
      serialStream = activeSerialPort.getInputStream();

      // purge contents, if any
      purgeStream(serialStream);

      // report status
      if (log.isInfoEnabled()) {
        log.info(
            "Wangrow " + portName + " port opened at " + activeSerialPort.getBaudRate() + " baud");
      }
      opened = true;

    } catch (gnu.io.NoSuchPortException p) {
      return handlePortNotFound(p, portName, log);
    } catch (Exception ex) {
      log.error("Unexpected exception while opening port " + portName + " trace follows: " + ex);
      ex.printStackTrace();
      return "Unexpected error while opening port " + portName + ": " + ex;
    }

    return null; // indicates OK return
  }
  public synchronized String openPort(String portName, String appName) {
    // open the port, check ability to set moderators
    try {
      // get and open the primary port
      CommPortIdentifier portID = CommPortIdentifier.getPortIdentifier(portName);
      try {
        activeSerialPort = (SerialPort) portID.open(appName, 2000); // name of program, msec to wait
      } catch (PortInUseException p) {
        handlePortBusy(p, portName);
        return "Port " + p + " in use already";
      }

      // try to set it for communication via SerialDriver
      try {
        // Doc says 7 bits, but 8 seems needed
        activeSerialPort.setSerialPortParams(
            38400, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
      } catch (gnu.io.UnsupportedCommOperationException e) {
        log.error("Cannot set serial parameters on port " + portName + ": " + e.getMessage());
        return "Cannot set serial parameters on port " + portName + ": " + e.getMessage();
      }

      // set RTS high, DTR high
      activeSerialPort.setRTS(true); // not connected in some serial ports and adapters
      activeSerialPort.setDTR(true); // pin 1 in DIN8; on main connector, this is DTR

      // disable flow control; hardware lines used for signaling, XON/XOFF might appear in data
      activeSerialPort.setFlowControlMode(0);

      // set timeout
      log.debug(
          "Serial timeout was observed as: "
              + activeSerialPort.getReceiveTimeout()
              + " "
              + activeSerialPort.isReceiveTimeoutEnabled());

      // get and save stream
      serialStream = new DataInputStream(activeSerialPort.getInputStream());
      ostream = activeSerialPort.getOutputStream();

      // make less verbose
      sendBytes(new byte[] {(byte) 'L', (byte) '-', 10, 13});
      // purge contents, if any
      int count = serialStream.available();
      log.debug("input stream shows " + count + " bytes available");
      while (count > 0) {
        serialStream.skip(count);
        count = serialStream.available();
      }

      // report status?
      if (log.isInfoEnabled()) {
        log.info(
            portName
                + " port opened at "
                + activeSerialPort.getBaudRate()
                + " baud, sees "
                + " DTR: "
                + activeSerialPort.isDTR()
                + " RTS: "
                + activeSerialPort.isRTS()
                + " DSR: "
                + activeSerialPort.isDSR()
                + " CTS: "
                + activeSerialPort.isCTS()
                + "  CD: "
                + activeSerialPort.isCD());
      }

    } catch (java.io.IOException ex) {
      log.error("IO error while opening port " + portName, ex);
      return "IO error while opening port " + portName + ": " + ex;
    } catch (gnu.io.UnsupportedCommOperationException ex) {
      log.error("Unsupported communications operation while opening port " + portName, ex);
      return "Unsupported communications operation while opening port " + portName + ": " + ex;
    } catch (gnu.io.NoSuchPortException ex) {
      log.error("No such port: " + portName, ex);
      return "No such port: " + portName + ": " + ex;
    }
    return null; // indicates OK return
  }