/***
* 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 net.wimpi.modbus.Modbus;
import net.wimpi.modbus.io.ModbusTCPTransaction;
import net.wimpi.modbus.io.ModbusTransaction;
import net.wimpi.modbus.msg.ModbusRequest;
import net.wimpi.modbus.msg.ReadInputRegistersRequest;
import net.wimpi.modbus.msg.ReadInputRegistersResponse;
import net.wimpi.modbus.msg.WriteSingleRegisterRequest;
import net.wimpi.modbus.net.TCPMasterConnection;
import net.wimpi.modbus.procimg.SimpleRegister;
import java.net.InetAddress;
/**
* Class that implements a simple commandline
* tool which demonstrates how a analog input
* can be bound with a analog output.
* <p/>
* Note that if you write to a remote I/O with
* a Modbus protocol stack, it will most likely
* expect that the communication is <i>kept alive</i>
* after the first write message.<br>
* This can be achieved either by sending any kind of
* message, or by repeating the write message within a
* given period of time.<br>
* If the time period is exceeded, then the device might
* react by turning pos all signals of the I/O modules.
* After this timeout, the device might require a
* reset message.
*
* @author Dieter Wimberger
* @version @version@ (@date@)
*/
public class AIAOTest {
public static void main(String[] args) {
InetAddress addr = null;
TCPMasterConnection con = null;
ModbusRequest ai_req = null;
WriteSingleRegisterRequest ao_req = null;
ModbusTransaction ai_trans = null;
ModbusTransaction ao_trans = null;
int ai_ref = 0;
int ao_ref = 0;
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);
ai_ref = Integer.parseInt(args[1]);
ao_ref = Integer.parseInt(args[2]);
} catch (Exception ex) {
ex.printStackTrace();
printUsage();
System.exit(1);
}
}
//2. Open the connection
con = new TCPMasterConnection(addr);
con.setPort(port);
con.connect();
if (Modbus.debug) System.out.println("Connected to " + addr.toString() + ":" + con.getPort());
//3. Prepare the requests
ai_req = new ReadInputRegistersRequest(ai_ref, 1);
ao_req = new WriteSingleRegisterRequest();
ao_req.setReference(ao_ref);
ai_req.setUnitID(0);
ao_req.setUnitID(0);
//4. Prepare the transactions
ai_trans = new ModbusTCPTransaction(con);
ai_trans.setRequest(ai_req);
ao_trans = new ModbusTCPTransaction(con);
ao_trans.setRequest(ao_req);
//5. Prepare holders to update only on change
SimpleRegister new_out = new SimpleRegister(0);
ao_req.setRegister(new_out);
int last_out = Integer.MIN_VALUE;
//5. Execute the transaction repeatedly
do {
ai_trans.execute();
int new_in =
((ReadInputRegistersResponse) ai_trans.getResponse()).getRegister(0).getValue();
//write only if differ
if (new_in != last_out) {
new_out.setValue(new_in); //update register
ao_trans.execute();
last_out = new_in;
if(Modbus.debug) System.out.println("Updated Register with value from Input Register.");
}
} while (true);
} catch (Exception ex) {
ex.printStackTrace();
} finally {
//6. Close the connection
con.close();
}
}//main
private static void printUsage() {
System.out.println("java net.wimpi.modbus.cmd.AIAOTest <address{:<port>} [String]> <register a_in [int16]> <register a_out [int16]>");
}//printUsage
}//class AIAOTest