Implementation of the basic functionality of the Modbus TCP and UDP based protocol using PHP.
NOTE: This is a fork to fix & update the library code (and code alone). Notably, the tests are probably all broken.
What's new
This fork adds a namespace and fixes issues encountered when porting to PHP 7
- 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
- The PHP extension php_sockets.dll should be enabled (server php.ini file)
use PHPModbus/ModbusMaster;
use PHPModbus/PhpType;
// 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);
Use the setTimeout($seconds)
and setSocketTimeout($read_timeout_sec, $write_timeout_sec)
methods to adjust wait times.
Most of the code is (to some extent) commented and documented with PhpDoc. You should get useful tooltips in your IDE.
This project was originally hosted on (now defunct) Google Code. It's still archived here: