PHP and Modbus TCP: Building a real-time data monitoring system
Abstract:
This article will introduce how to use PHP and Modbus TCP protocol to build a real-time data monitoring system. Modbus TCP is a communication protocol used to transmit data in the field of industrial automation. By using the PHP programming language, and the support library for the Modbus TCP protocol, we can easily communicate with the Modbus TCP server and monitor and obtain data in real time. The article will provide code examples to help readers better understand the implementation process.
//Set the IP address and port of the Modbus TCP server
$server_ip = '192.168.1.1';
$server_port = 502;
// Create Modbus TCP client
$client = new ModbusTcpClient($server_ip, $server_port);
// Connect to Modbus TCP server
$client->connect();
// Read the value of the register
$address = 0; // Register address
$value = $client->readRegister($address );
// Output the read value
echo 'Read value: ' . $value;
// Disconnect from the Modbus TCP server
$ client->disconnect();
?>
The above sample code demonstrates how to communicate using PHP and the Modbus TCP support library. First, we set the IP address and port of the Modbus TCP server. Then, we create a ModbusTcpClient object and call the connect() method to connect to the Modbus TCP server. Next, we read the value of the register using the readRegister() method and store the result in the $value variable. Finally, we disconnect from the Modbus TCP server and output the read value to the screen.
References:
[1] Modbus TCP Support Library, https://www.modbustcp.net/
[2] PHP: Hypertext Preprocessor, https:/ /www.php.net/
[3] TCP/IP, https://en.wikipedia.org/wiki/Transmission_Control_Protocol
The above is the detailed content of PHP and Modbus TCP: Building a real-time data monitoring system. For more information, please follow other related articles on the PHP Chinese website!