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rtu.php
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rtu.php
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<?php
use ModbusTcpClient\Network\BinaryStreamConnection;
use ModbusTcpClient\Packet\ModbusFunction\ReadHoldingRegistersRequest;
use ModbusTcpClient\Packet\RtuConverter;
use ModbusTcpClient\Utils\Packet;
require __DIR__ . '/../vendor/autoload.php';
require __DIR__ . '/logger.php';
$connection = BinaryStreamConnection::getBuilder()
->setPort(502)
->setHost('127.0.0.1')
->setReadTimeoutSec(3) // increase read timeout to 3 seconds
->setIsCompleteCallback(function ($binaryData, $streamIndex) {
return Packet::isCompleteLengthRTU($binaryData);
})
->setLogger(new EchoLogger())
->build();
$startAddress = 256;
$quantity = 6;
$slaveId = 1; // RTU packet slave id equivalent is Modbus TCP unitId
$tcpPacket = new ReadHoldingRegistersRequest($startAddress, $quantity, $slaveId);
$rtuPacket = RtuConverter::toRtu($tcpPacket);
try {
$binaryData = $connection->connect()->sendAndReceive($rtuPacket);
echo 'RTU Binary received (in hex): ' . unpack('H*', $binaryData)[1] . PHP_EOL;
$response = RtuConverter::fromRtu($binaryData);
echo 'Parsed packet (in hex): ' . $response->toHex() . PHP_EOL;
echo 'Data parsed from packet (bytes):' . PHP_EOL;
print_r($response->getData());
} catch (Exception $exception) {
echo 'An exception occurred' . PHP_EOL;
echo $exception->getMessage() . PHP_EOL;
echo $exception->getTraceAsString() . PHP_EOL;
} finally {
$connection->close();
}