Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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<?php
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require_once dirname(__FILE__) . '/../../Phpmodbus/ModbusMasterUdp.php';
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require_once dirname(__FILE__) . '/../config.php';
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// Create Modbus object
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$modbus = new ModbusMasterUdp($test_host_ip);
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// Data to be writen - BOOL array
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$data = array(1, 0, TRUE, TRUE, 0, 1, TRUE, TRUE,
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1, 1, TRUE, TRUE, 0, 0, FALSE, FALSE,
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0, 0, FALSE, FALSE, 1, 1, TRUE, TRUE,
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1, 1, TRUE, TRUE, 1, 1, TRUE, TRUE);
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// Write data - FC 15
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$modbus->writeMultipleCoils(0, 12288, $data);
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//echo $modbus->status;
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//$modbus->status = "";
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//echo "\n\n";
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// Read data - FC 1
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$recData = $modbus->readCoils(0, 12288, 32);
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//echo $modbus->status;
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//echo "\n\n";
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var_dump($recData);
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