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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$modbus = new ModbusMaster("192.192.15.51", "UDP");
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// Data to be writen
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$bitValue = true;
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$bitNumber = 2;
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$andMask = 0xFFFF ^ pow(2, $bitNumber);
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$orMask = 0x0000 ^ (pow(2, $bitNumber) * $bitValue);
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try {
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// FC22
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$modbus->maskWriteRegister(0, 12288, $andMask, $orMask);
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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 $modbus;
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