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\ModbusMasterUdp;
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// Create Modbus object
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$modbus = new ModbusMasterUdp("192.192.15.51");
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try {
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// Read input discretes - FC 4
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$recData = $modbus->readMultipleInputRegisters(0, 0, 2);
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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 $e;
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exit;
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}
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var_dump($recData);
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