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63 lines
1.8 KiB
63 lines
1.8 KiB
<?php
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use PHPModbus\ModbusMaster;
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use PHPModbus\PhpType;
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$ip = filter_var($_GET['ip'], FILTER_VALIDATE_IP) ? $_GET['ip'] : '192.192.15.51';
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$unitId = ((int)$_GET['unitid']) ?: 0;
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$reference = ((int)$_GET['reference']) ?: 12288;
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$quantity = ((int)$_GET['quantity']) ?: 10;
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$modbus = new ModbusMaster($ip, 'UDP');
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try {
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// FC 3
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// read 10 words (20 bytes) from device ID=0, address=12288
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$recData = $modbus->readMultipleRegisters($unitId, $reference, $quantity);
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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 $e;
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exit;
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}
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// Received data
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echo "<h1>Received Data</h1>\n";
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print_r($recData);
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// Conversion
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echo "<h2>32 bits types</h2>\n";
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// Chunk the data array to set of 4 bytes
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$values = array_chunk($recData, 4);
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// Get float from REAL interpretation
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echo "<h3>REAL to Float</h3>\n";
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foreach ($values as $bytes)
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echo PhpType::bytes2float($bytes) . "</br>";
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// Get integer from DINT interpretation
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echo "<h3>DINT to integer </h3>\n";
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foreach ($values as $bytes)
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echo PhpType::bytes2signedInt($bytes) . "</br>";
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// Get integer of float from DINT interpretation
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echo "<h3>DWORD to integer (or float) </h3>\n";
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foreach ($values as $bytes)
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echo PhpType::bytes2unsignedInt($bytes) . "</br>";
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echo "<h2>16 bit types</h2>\n";
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// Chunk the data array to set of 4 bytes
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$values = array_chunk($recData, 2);
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// Get signed integer from INT interpretation
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echo "<h3>INT to integer </h3>\n";
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foreach ($values as $bytes)
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echo PhpType::bytes2signedInt($bytes) . "</br>";
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// Get unsigned integer from WORD interpretation
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echo "<h3>WORD to integer </h3>\n";
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foreach ($values as $bytes)
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echo PhpType::bytes2unsignedInt($bytes) . "</br>";
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// Get string from STRING interpretation
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echo "<h3>STRING to string </h3>\n";
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echo PhpType::bytes2string($recData) . "</br>";
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