示例#1
0
  /** Opens a new connection to the slave. */
  private void prepareConnection() {
    try {
      connection = new TCPMasterConnection(address);
      connection.setPort(port);

      connection.connect();

      transaction = new ModbusTCPTransaction(this.connection);
    } catch (Exception e) {
      log.warning("Opening connection not successful: " + e.getMessage());
    }
  }
示例#2
0
  /**
   * Read one value of the slave
   *
   * @param address Address of Memory of value in slave
   * @return the read value
   */
  public int sendReadRequest(int address) throws Exception {

    ReadInputRegistersResponse response = null;
    short tmp_value = 0;

    try {
      ReadInputRegistersRequest request = new ReadInputRegistersRequest(address, 1);
      response = (ReadInputRegistersResponse) this.sendRequest(request);
      tmp_value = response.getRegister(0).toShort();
      if (tmp_value == 0x7FFF) throw new Exception("0x7FFF received - value ignored");
    } catch (Exception ex) {
      log.warning("Error on reading value: " + ex.getMessage());
      throw ex;
    }
    return tmp_value;
  }
示例#3
0
  /**
   * Creates the ModBusWrapper.
   *
   * @param ip can contain the port information
   */
  public ModBusWrapper(String ip) {
    int idx = ip.indexOf(':');

    // extract port information
    if (idx > 0) {
      port = Integer.parseInt(ip.substring(idx + 1));
      ip = ip.substring(0, idx);
    }

    try {
      address = InetAddress.getByName(ip);
    } catch (Exception e) {
      log.severe("Failed to create address: " + ip + ";" + e.getMessage());
      return;
    }
  }
示例#4
0
  /**
   * Send a request to JAMod library. Opens and closes the connection each time. Otherwise the TCP
   * Stack of the slaves seams to have problems creating a response.
   *
   * @param request
   * @return the response
   */
  private ModbusResponse sendRequest(ModbusRequest request) {
    if (request == null) return null;
    prepareConnection();

    ModbusResponse response = null;
    transaction.setRequest(request);

    try {
      transaction.execute();
      response = transaction.getResponse();
    } catch (Exception e) {
      log.warning("Sending request not successful: " + e.getMessage());
    }
    this.connection.close();

    return response;
  }
示例#5
0
  /**
   * Write a configuration value to the slave
   *
   * @param address Address of the configuration value
   * @param value Value to be set
   * @return true if value received correctly
   */
  public boolean sendWriteRequest(int address, int value) {
    SimpleRegister reg = new SimpleRegister(value);

    try {
      WriteSingleRegisterRequest request = new WriteSingleRegisterRequest(address, reg);
      WriteSingleRegisterResponse response =
          (WriteSingleRegisterResponse) this.sendRequest(request);

      if (value != response.getRegisterValue()) {
        log.warning("The sent value isn't the same as the received value");
        return false;
      }
    } catch (Exception ex) {
      log.warning("Error on writing value: " + ex.getMessage());
      return false;
    }

    return true;
  }