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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.AbstractDataRequest;
import com.invertor.modbus.msg.base.ModbusResponse;
import com.invertor.modbus.msg.response.MaskWriteRegisterResponse;
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 MaskWriteRegisterRequest extends AbstractDataRequest {
private int maskAnd;
private int maskOr;
public MaskWriteRegisterRequest(int serverAddress) throws ModbusNumberException {
super(serverAddress);
}
public MaskWriteRegisterRequest(int serverAddress, int startAddress, int maskAnd, int maskOr) throws ModbusNumberException {
super(serverAddress, startAddress);
setMaskAnd(maskAnd);
setMaskOr(maskOr);
}
/*result = ((reg & and) | (or & !and))*/
@Override
public ModbusResponse process(DataHolder dataHolder) throws ModbusNumberException {
MaskWriteRegisterResponse response = new MaskWriteRegisterResponse(getServerAddress(), getStartAddress(), getMaskAnd(), getMaskOr());
try {
int reg = dataHolder.readHoldingRegister(getStartAddress());
dataHolder.writeHoldingRegister(getStartAddress(), (reg & getMaskAnd()) | (getMaskOr() & (~getMaskAnd())));
} catch (ModbusProtocolException e) {
response.setException();
response.setModbusExceptionCode(e.getException().getValue());
}
return response;
}
@Override
public boolean validateResponseImpl(ModbusResponse response) {
if (!(response instanceof MaskWriteRegisterResponse)) {
return false;
}
MaskWriteRegisterResponse r = (MaskWriteRegisterResponse) response;
return (r.getStartAddress() == getStartAddress()) &&
(r.getMaskAnd() == getMaskAnd()) &&
(r.getMaskOr() == getMaskOr());
}
@Override
protected void readData(ModbusInputStream fifo) throws IOException {
setMaskAnd(fifo.readShortBE());
setMaskOr(fifo.readShortBE());
}
@Override
public void writeData(ModbusOutputStream fifo) throws IOException {
fifo.writeShortBE(getMaskAnd());
fifo.writeShortBE(getMaskOr());
}
@Override
public int getFunction() {
return ModbusFunctionCode.MASK_WRITE_REGISTER.toInt();
}
@Override
protected int dataSize() {
return 4;
}
public int getMaskAnd() {
return maskAnd;
}
public void setMaskAnd(int maskAnd) {
this.maskAnd = maskAnd;
}
public int getMaskOr() {
return maskOr;
}
public void setMaskOr(int maskOr) {
this.maskOr = maskOr;
}
}