modbus tcp通信

composer require aldas/modbus-tcp-client 2.4

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use ModbusTcpClient\Network\BinaryStreamConnection;
use ModbusTcpClient\Packet\ModbusFunction\ReadHoldingRegistersRequest;
use ModbusTcpClient\Packet\ModbusFunction\ReadHoldingRegistersResponse;

class ModbusController extends Controller
{
    public function connect()
    {
        try {
            // 创建 Modbus TCP 连接
            $connection = BinaryStreamConnection::getBuilder()
                ->setHost('192.168.254.15')
                ->setPort(502)
                ->build();

            // 建立连接
            $connection->connect();

            // 创建读取保持寄存器请求
            $request = new ReadHoldingRegistersRequest(0, 256, 3);

            // 发送请求并获取响应
            /** @var ReadHoldingRegistersResponse $response */
            $response = $connection->sendAndReceive($request);

            // 获取响应数据
            $data = $response->getData();

            // 关闭连接
            $connection->close();

            return $data;
        } catch (\Exception $e) {
            return 'Modbus TCP 连接失败：' . $e->getMessage();
        }
    }
}

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use ModbusTcpClient\Network\BinaryStreamConnection;

class ModbusController extends Controller
{
    public function testConnection()
    {
        try {
            // 创建 Modbus TCP 连接
            $connection = BinaryStreamConnection::getBuilder()
                ->setHost('192.168.254.15')
                ->setPort(502)
                ->build();

            // 建立连接
            $connection->connect();

            // 连接成功
            $message = 'Modbus TCP 连接成功';

            // 关闭连接
            $connection->close();

            return $message;
        } catch (\Exception $e) {
            return 'Modbus TCP 连接失败：' . $e->getMessage();
        }
    }
}