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Implementation of the Modbus protocol in Java language
There is a newer version: 1.2.9.0
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.ReadFifoQueueResponse;
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]
 */
public class ReadFifoQueueRequest extends AbstractDataRequest {

    public ReadFifoQueueRequest(int serverAddress) throws ModbusNumberException {
        super(serverAddress);
    }

    public ReadFifoQueueRequest(int serverAddress, int startAddress) throws ModbusNumberException {
        super(serverAddress, startAddress);
    }

    @Override
    protected void writeData(ModbusOutputStream fifo) throws IOException {
        //no op
    }

    @Override
    protected void readData(ModbusInputStream fifo) throws IOException, ModbusNumberException {
        //no op
    }

    @Override
    protected int dataSize() {
        return 0;
    }

    @Override
    public ModbusResponse process(DataHolder dataHolder) throws ModbusNumberException {
        ReadFifoQueueResponse response = new ReadFifoQueueResponse(getServerAddress());
        try {
            int[] r = dataHolder.readFifoQueue(getStartAddress());
            response.setFifoValueRegister(r);
        } catch (ModbusProtocolException e) {
            response.setException();
            response.setModbusExceptionCode(e.getException().getValue());
        }
        return response;
    }

    @Override
    public boolean validateResponseImpl(ModbusResponse response) {
        return true;
    }

    @Override
    public int getFunction() {
        return ModbusFunctionCode.READ_FIFO_QUEUE.toInt();
    }
}