How can consulting Modbus protocol documentation help in resolving issues related to incorrect data output in PHP Modbus TCP communication?

Issue: Consulting Modbus protocol documentation can help in resolving issues related to incorrect data output in PHP Modbus TCP communication by ensuring that the correct data types, registers, and addressing are used when reading or writing data to Modbus devices. 

// Example code snippet for reading holding registers using Modbus TCP in PHP
$modbus = new ModbusMaster("192.168.1.1", "TCP");
$data = $modbus->readMultipleRegisters(0, 10, 5); // Read 5 holding registers starting from address 10
if(!$data){
    echo "Error reading data from Modbus device";
} else {
    foreach($data as $value){
        echo "Register value: " . $value . "\n";
    }
}

Keywords

Modbus protocol documentation data output PHP communication TCP

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