Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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<?php
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use PHPModbus\ModbusMaster;
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// Create Modbus object
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$modbus = new ModbusMaster("192.192.15.51", "UDP");
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try {
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// FC 1
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$recData = $modbus->readCoils(0, 12288, 12);
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} catch (Exception $e) {
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// Print error information if any
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echo $modbus;
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echo $e;
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exit;
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}
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// Print status information
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echo "</br>Status:</br>" . $modbus;
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// Print read data
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echo "</br>Data:</br>";
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var_dump($recData);
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echo "</br>";
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