php-modbus/README.md

phpmodbus

This project deals with an implementation of the basic functionality of the Modbus TCP and UDP based protocol using PHP. It's a copy of the releases from the project page over at Google Code with composer support added.

Features

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

Example

// 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);