net.wimpi.modbus.cmd.DIDOTest Maven / Gradle / Ivy
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/***
* 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.io.ModbusTCPTransaction;
import net.wimpi.modbus.msg.ModbusRequest;
import net.wimpi.modbus.msg.ReadInputDiscretesRequest;
import net.wimpi.modbus.msg.ReadInputDiscretesResponse;
import net.wimpi.modbus.msg.WriteCoilRequest;
import net.wimpi.modbus.net.TCPMasterConnection;
import net.wimpi.modbus.Modbus;
/**
* Class that implements a simple commandline
* tool which demonstrates how a digital input
* can be bound with a digital output.
*
* Note that if you write to a remote I/O with
* a Modbus protocol stack, it will most likely
* expect that the communication is kept alive
* after the first write message.
* This can be achieved either by sending any kind of
* message, or by repeating the write message within a
* given period of time.
* 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 1.2 (@date@)
*/
public class DIDOTest {
public static void main(String[] args) {
InetAddress addr = null;
TCPMasterConnection con = null;
ModbusRequest di_req = null;
WriteCoilRequest do_req = null;
ModbusTCPTransaction di_trans = null;
ModbusTCPTransaction do_trans = null;
int di_ref = 0;
int do_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);
di_ref = Integer.parseInt(args[1]);
do_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
di_req = new ReadInputDiscretesRequest(di_ref, 1);
do_req = new WriteCoilRequest();
do_req.setReference(do_ref);
di_req.setUnitID(0);
do_req.setUnitID(0);
//4. Prepare the transactions
di_trans = new ModbusTCPTransaction(con);
di_trans.setRequest(di_req);
di_trans.setReconnecting(false);
do_trans = new ModbusTCPTransaction(con);
do_trans.setRequest(do_req);
do_trans.setReconnecting(false);
//5. Holders for last states
boolean last_out = false;
boolean new_in = false;
//6. Execute the transactions repeatedly
do {
di_trans.execute();
new_in = ((ReadInputDiscretesResponse) di_trans.getResponse())
.getDiscreteStatus(0);
//write only if differ
if (new_in != last_out) {
do_req.setCoil(new_in);
do_trans.execute();
last_out = new_in;
if (Modbus.debug) System.out.println("Updated coil with state from DI.");
}
} while (true);
} catch (Exception ex) {
ex.printStackTrace();
} finally {
//7. Close the connection
con.close();
}
}//main
private static void printUsage() {
System.out.println(
"java net.wimpi.modbus.cmd.DIDOTest } [String]> "
);
}//printUsage
}//class DIDOTest