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Implementation of the Modbus protocol in Java language
package com.invertor.modbus.msg.request;
import com.invertor.modbus.data.DataHolder;
import com.invertor.modbus.exception.ModbusNumberException;
import com.invertor.modbus.exception.ModbusProtocolException;
import com.invertor.modbus.msg.base.ModbusRequest;
import com.invertor.modbus.msg.base.ModbusResponse;
import com.invertor.modbus.msg.response.ReadExceptionStatusResponse;
import com.invertor.modbus.net.stream.base.ModbusInputStream;
import com.invertor.modbus.net.stream.base.ModbusOutputStream;
import com.invertor.modbus.utils.ModbusFunctionCode;
import java.io.IOException;
/*
* Copyright (C) 2016 "Invertor" Factory", JSC
* [http://www.sbp-invertor.ru]
*
* This file is part of JLibModbus.
*
* 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.
*
* Authors: Vladislav Y. Kochedykov, software engineer.
* email: [email protected]
*/
final public class ReadExceptionStatusRequest extends ModbusRequest {
public ReadExceptionStatusRequest(int serverAddress) throws ModbusNumberException {
super(serverAddress);
}
@Override
public void writeRequest(ModbusOutputStream fifo) throws IOException {
//no operation
}
@Override
public int requestSize() {
return 0;
}
@Override
public ModbusResponse process(DataHolder dataHolder) throws ModbusNumberException {
ReadExceptionStatusResponse response = new ReadExceptionStatusResponse(getServerAddress());
try {
int exceptionStatus = dataHolder.readExceptionStatus();
response.setExceptionStatus(exceptionStatus);
} catch (ModbusProtocolException e) {
response.setException();
response.setModbusExceptionCode(e.getException().getValue());
}
return response;
}
@Override
public boolean validateResponseImpl(ModbusResponse response) {
return true;
}
@Override
public void readPDU(ModbusInputStream fifo) throws ModbusNumberException, IOException {
//no operation
}
@Override
public int getFunction() {
return ModbusFunctionCode.READ_EXCEPTION_STATUS.toInt();
}
}