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rtu_usb_to_serial_stream.php
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rtu_usb_to_serial_stream.php
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<?php
use ModbusTcpClient\Network\BinaryStreamConnection;
use ModbusTcpClient\Packet\ModbusFunction\ReadInputRegistersRequest;
use ModbusTcpClient\Packet\ModbusFunction\ReadInputRegistersResponse;
use ModbusTcpClient\Packet\RtuConverter;
require __DIR__ . '/../vendor/autoload.php';
$connection = BinaryStreamConnection::getBuilder()
->setUri('/dev/ttyUSB0')
->setProtocol('serial')
->build();
$startAddress = 1;
$quantity = 2;
$slaveId = 1; // RTU packet slave id equivalent is Modbus TCP unitId
$tcpPacket = new ReadInputRegistersRequest($startAddress, $quantity, $slaveId);
$rtuPacket = RtuConverter::toRtu($tcpPacket);
try {
echo 'RTU Binary to sent (in hex): ' . unpack('H*', $rtuPacket)[1] . PHP_EOL;
$start = microtime(true);
$binaryData = $connection->connect()->sendAndReceive($rtuPacket);
$end = (microtime(true) - $start) * 1000;
echo 'Response in: ' . $end . ' ms' . PHP_EOL;
echo 'RTU Binary received (in hex): ' . unpack('H*', $binaryData)[1] . PHP_EOL;
/** @var ReadInputRegistersResponse $response */
$response = RtuConverter::fromRtu($binaryData)->withStartAddress($startAddress);
echo 'Parsed packet (in hex): ' . $response->toHex() . PHP_EOL;
echo PHP_EOL;
echo 'Temperature: ' . ($response->getWordAt(1)->getInt16() / 10) . PHP_EOL;
echo 'Humidity: ' . ($response->getWordAt(2)->getInt16() / 10) . PHP_EOL;
} catch (Exception $exception) {
echo 'An exception occurred' . PHP_EOL;
echo $exception->getMessage() . PHP_EOL;
echo $exception->getTraceAsString() . PHP_EOL;
} finally {
$connection->close();
}