PhpModbus

This project deals with an implementation of the basic functionality of the Modbus TCP and UDP based protocol using PHP.

Implemented features:

• Modbus master
• FC1 - Read coils
• FC3 - Read holding registers
• 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
$recData = $modbus->readMultipleRegisters(0, 12288, 5); 
// Print data in string format
echo PhpType::bytes2string($recData); 

For more see documentation or FAQ.

Note:

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