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Implementation of the Modbus protocol in Java language
package com.invertor.modbus.msg.response;
import com.invertor.modbus.Modbus;
import com.invertor.modbus.exception.ModbusNumberException;
import com.invertor.modbus.msg.base.ModbusResponse;
import com.invertor.modbus.net.stream.base.ModbusInputStream;
import com.invertor.modbus.net.stream.base.ModbusOutputStream;
import com.invertor.modbus.utils.DataUtils;
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]
*/
public class ReadFifoQueueResponse extends ModbusResponse {
private byte[] bytes;
public ReadFifoQueueResponse(int serverAddress) throws ModbusNumberException {
super(serverAddress);
}
private void checkFifoCount(int fifoCount) throws ModbusNumberException {
if (fifoCount > Modbus.MAX_FIFO_COUNT)
throw new ModbusNumberException("Fifo count greater than max fifo count", fifoCount);
}
@Override
protected void readResponse(ModbusInputStream fifo) throws IOException, ModbusNumberException {
int byteCount = fifo.readShortBE();
int fifoCount = fifo.readShortBE();
if ((fifoCount * 2) != byteCount)
throw new ModbusNumberException("Fifo count not matches bytes*2", fifoCount);
checkFifoCount(fifoCount);
bytes = new byte[byteCount];
if (fifo.read(bytes) != byteCount) {
throw new IOException("Can't read fifo value register");
}
}
@Override
protected void writeResponse(ModbusOutputStream fifo) throws IOException {
int[] r = getFifoValueRegister();
fifo.writeShortBE(r.length * 2);
fifo.writeShortBE(r.length);
fifo.write(DataUtils.toByteArray(r));
}
@Override
protected int responseSize() {
return 2 + 2 + (bytes != null ? bytes.length : 0);
}
@Override
public int getFunction() {
return ModbusFunctionCode.READ_FIFO_QUEUE.toInt();
}
public int[] getFifoValueRegister() {
return DataUtils.toIntArray(bytes);
}
public void setFifoValueRegister(int[] fifoValueRegister) throws ModbusNumberException {
checkFifoCount(fifoValueRegister.length);
this.bytes = DataUtils.toByteArray(fifoValueRegister);
}
}