Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc6.php

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378 B

<?php
use PHPModbus\ModbusMaster;
// Create Modbus object
$modbus = new ModbusMaster("192.192.15.51", "UDP");
// Data to be writen
$data = array(-1000);
try {
// FC6
$modbus->writeSingleRegister(0, 12288, $data);
} catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
// Print status information
echo $modbus;