phpmodbus 를 이용하여, modbus 통신하기 > 시리얼 통신

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https://github.com/adduc/phpmodbus

컴포저로 phpmodbus 설치
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https://packagist.org/packages/mightypork/phpmodbus
> composer require mightypork/phpmodbus
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com 포트 사용시 아래것 이용
https://packagist.org/packages/fawno/modbus



<?php

use PHPModbus\ModbusMaster;

// Create Modbus object
$modbus = new ModbusMaster("172.30.1.118", "TCP");
$modbus->port = 9999;
$data = array(
    //1, 0, 1, 1, 0, 1, 1, 1
    0, 0, 0, 0, 0, 0, 0, 0
    //1, 1, 1, 1, 1, 1, 1, 1
);

try {
    // FC 3
    //$recData = $modbus->readMultipleRegisters(2, 0, 8);
    
    // 8025 읽어오기
    echo " 1 : " ;
    $recData = $modbus->readMultipleRegisters(1, 0, 8);
    print_r($recData);
    echo "<br />";

    echo " 2 : " ;
    $recData = $modbus->readMultipleRegisters(2, 0, 8);
    print_r($recData);
    echo "<br />";

    // 3066 읽고 쓰기
    //$data[2] = $data[3] = 1;
    $modbus->writeMultipleCoils(1, 0, $data);

    echo "3 :";
    $rData = $modbus->readCoils(1, 0, 8);
    print_r($rData);

    

} catch (Exception $e) {
    // Print error information if any
    echo "--> modbus : " . $modbus;
    echo "--> e : " . $e;
    exit;
}

// Print status information
//echo "</br>Status:</br>" . $modbus;

// Print read data
//echo "</br>Data:</br>";
//print_r($recData);
//echo "</br>";
?>