Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc22.php

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538 B

<?php
require_once dirname(__FILE__) . '/../Phpmodbus/ModbusMaster.php';
// Create Modbus object
$modbus = new ModbusMaster("192.192.15.51", "UDP");
// Data to be writen
$bitValue = true;
$bitNumber = 2;
$andMask = 0xFFFF ^ pow(2, $bitNumber) ;
$orMask = 0x0000 ^ (pow(2, $bitNumber) * $bitValue ) ;
try {
// FC22
$modbus->maskWriteRegister(0, 12288, $andMask, $orMask);
}
catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
// Print status information
echo $modbus;
?>