sf_bigScreen/src/main/java/com/htyg/manger/controller/ModbusReader1.java

package com.htyg.manger.controller;
import com.alibaba.fastjson.JSONObject;
import com.ghgande.j2mod.modbus.io.ModbusSerialTransaction;
import com.ghgande.j2mod.modbus.msg.ReadMultipleRegistersRequest;
import com.ghgande.j2mod.modbus.msg.ReadMultipleRegistersResponse;
import com.ghgande.j2mod.modbus.net.SerialConnection;
import com.ghgande.j2mod.modbus.util.SerialParameters;

public class ModbusReader1 {

    private static final String PORT_NAME = "COM3"; // 更改为你的串口名称
    private static final int BAUD_RATE = 9600;
    private static final int DATA_BITS = 8;
    private static final int STOP_BITS = 1;
    private static final int PARITY = 0; // 无校验位

    public static void main(String[] args) {
        JSONObject jsonObject=new JSONObject();
        getData(jsonObject);
    }

    //1605 水箱温度
    public static void getData(JSONObject jsonObject) {
        SerialParameters parameters = new SerialParameters();
        parameters.setPortName(PORT_NAME);
        parameters.setBaudRate(BAUD_RATE);
        parameters.setDatabits(DATA_BITS);
        parameters.setStopbits(STOP_BITS);
        parameters.setParity(PARITY);

        SerialConnection connection = new SerialConnection(parameters);

        try {
            connection.open();
            ModbusSerialTransaction transaction = new ModbusSerialTransaction(connection);
            ReadMultipleRegistersRequest request = new ReadMultipleRegistersRequest();
            request.setUnitID(1); // Modbus设备的ID，通常为1
            request.setReference(1600); // 寄存器起始地址

            // 读取连续6个单字节（每个字节占用一个寄存器）
            request.setWordCount(20);

            transaction.setRequest(request);
            transaction.execute();

            ReadMultipleRegistersResponse response = (ReadMultipleRegistersResponse) transaction.getResponse();
            if (response != null) {
                for (int i = 0; i < response.getWordCount(); i++) {
                    // 每个字节占用一个寄存器，直接读取寄存器值即可
                    int value = response.getRegisterValue(i);
                    // 处理读取到的数据
                    System.out.println("Register " + (i + 1600) + ": " + value);
                    jsonObject.put(Integer.valueOf(i + 1600).toString(),value/10.0);
                }
            } else {
                System.out.println("Response is null.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.close();
            }
        }
    }
}