Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc23.php

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<?php
require __DIR__ . '/../vendor/autoload.php';
use PHPModbus\ModbusMasterUdp;
require_once __DIR__ . '/request_input_data.php'; // 'ip', 'unitid','reference','quantity' are read from $_GET
$modbus = new ModbusMasterUdp($ip);
// Data to be writen
$data = array(10, -1000, 2000, 3.0);
$dataTypes = array("WORD", "INT", "DINT", "REAL");
try {
// FC23
$recData = $modbus->readWriteRegisters($unitId, $reference, $quantity, $reference, $data, $dataTypes);
} catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
echo '<h1>Status</h1><pre>';
print_r($modbus);
echo '</pre>';
echo '<h1>Data</h1><pre>';
print_r($recData);
echo '</pre>';