UDPDITest.java

/***
 * Copyright 2002-2010 jamod development team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ***/

package net.wimpi.modbus.cmd;

import java.net.InetAddress;

import net.wimpi.modbus.Modbus;
import net.wimpi.modbus.io.ModbusUDPTransaction;
import net.wimpi.modbus.msg.ReadInputDiscretesRequest;
import net.wimpi.modbus.msg.ReadInputDiscretesResponse;
import net.wimpi.modbus.net.UDPMasterConnection;

/**
 * Class that implements a simple commandline
 * tool for reading a digital input.
 *
 * @author Dieter Wimberger
 * @version @version@ (@date@)
 */
public class UDPDITest {

    public static void main(String[] args) {

        UDPMasterConnection conn = null;
        ModbusUDPTransaction trans = null;
        ReadInputDiscretesRequest req = null;
        ReadInputDiscretesResponse res = null;

        InetAddress addr = null;
        int ref = 0;
        int count = 0;
        int repeat = 1;
        int port = Modbus.DEFAULT_PORT;

        try {

            // 1. Setup the parameters
            if (args.length < 3) {
                printUsage();
                System.exit(1);
            } else {
                try {
                    String astr = args[0];
                    int idx = astr.indexOf(':');
                    if (idx > 0) {
                        port = Integer.parseInt(astr.substring(idx + 1));
                        astr = astr.substring(0, idx);
                    }
                    addr = InetAddress.getByName(astr);
                    ref = Integer.parseInt(args[1]);
                    count = Integer.parseInt(args[2]);
                    if (args.length == 4) {
                        repeat = Integer.parseInt(args[3]);
                    }
                } catch (Exception ex) {
                    ex.printStackTrace();
                    printUsage();
                    System.exit(1);
                }
            }

            // 2. Open the connection
            conn = new UDPMasterConnection(addr);
            conn.setPort(port);
            conn.connect();

            // 3. Prepare the request
            req = new ReadInputDiscretesRequest(ref, count);
            req.setUnitID(0);
            if (Modbus.debug) {
                System.out.println("Request: " + req.getHexMessage());
            }

            // 4. Prepare the transaction
            trans = new ModbusUDPTransaction(conn);
            trans.setRequest(req);

            // 5. Execute the transaction repeat times
            int k = 0;
            do {
                trans.execute();

                res = (ReadInputDiscretesResponse) trans.getResponse();
                if (Modbus.debug) {
                    System.out.println("Response: " + res.getHexMessage());
                }
                System.out.println("Digital Inputs Status=" + res.getDiscretes().toString());
                k++;
            } while (k < repeat);

            // 6. Close the connection
            conn.close();

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }// main

    private static void printUsage() {
        System.out.println(
                "java net.wimpi.modbus.cmd.UDPDITest <address{:<port>} [String]> <register [int16]> <bitcount [int16]> {<repeat [int]>}");
    }// printUsage

}// class DITest