Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc2.php

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<?php
use PHPModbus\ModbusMaster;
// Create Modbus object
$modbus = new ModbusMaster("192.192.15.51", "UDP");
try {
// FC 2
// read 2 input bits from address 0x0 (Wago input image)
$recData = $modbus->readInputDiscretes(0, 0, 2);
} catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
// Print status information
echo "</br>Status:</br>" . $modbus;
// Print read data
echo "</br>Data:</br>";
var_dump($recData);
echo "</br>";