itonylee / phpmodbus

Modbus library for PHP (Google code follower)

phpmodbus

Implementation of the basic functionality of the Modbus TCP and UDP based protocol using PHP. This is the Google code project follower at https://code.google.com/p/phpmodbus/

Implemented features:

• Modbus master
• FC1 - Read coils
• FC2 - Read input discretes
• FC3 - Read holding registers
• FC4 - Read holding input registers
• FC5 - Write single coil
• FC6 - Write single register
• FC15 - Write multiple coils
• FC16 - Write multiple registers
• FC23 - Read/Write multiple registers

Example:

require_once dirname(__FILE__) . '/Phpmodbus/ModbusMaster.php'; 

// Modbus master UDP
$modbus = new ModbusMaster("192.168.1.1", "UDP"); 
// Read multiple registers
try {
    $recData = $modbus->readMultipleRegisters(0, 12288, 5); 
}
catch (Exception $e) {
    // Print error information if any
    echo $modbus;
    echo $e;
    exit;
}
// Print data in string format
echo PhpType::bytes2string($recData); 

For more see [http://code.google.com/p/phpmodbus/downloads/list documentation] or [http://code.google.com/p/phpmodbus/wiki/FAQ FAQ].

Note:

• The PHP extension php_sockets.dll should be enabled (server php.ini file)