Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/tests/ModbusMaster/test.udp.fc26.php

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<?php
require_once dirname(__FILE__) . '/../../Phpmodbus/ModbusMaster.php';
require_once dirname(__FILE__) . '/../config.php';
// Create Modbus object
$modbus = new ModbusMaster($test_host_ip, "UDP");
// Data to be writen
$data = array(1000, 2000, 1.250, 1.250);
$dataTypes = array("REAL", "REAL", "REAL", "REAL");
// FC23
$recData = $modbus->readWriteRegisters(0, 12288, 6, 12288, $data, $dataTypes);
if(!$recData) {
// Print error information if any
echo "</br>Error:</br>" . $modbus->errstr . "</br>";
//
exit();
}
// Print status information
echo "writeMultipleRegister (FC26): DONE";
?>