fc16.php

<?php

use ModbusTcpClient\Network\BinaryStreamConnection;
use ModbusTcpClient\Packet\ModbusFunction\WriteMultipleRegistersRequest;
use ModbusTcpClient\Packet\ModbusFunction\WriteMultipleRegistersResponse;
use ModbusTcpClient\Packet\ResponseFactory;
use ModbusTcpClient\Utils\Types;

require __DIR__ . '/../vendor/autoload.php';
require __DIR__ . '/logger.php';

$connection = BinaryStreamConnection::getBuilder()
    ->setPort(5020)
    ->setHost('127.0.0.1')
    ->setLogger(new EchoLogger())
    ->build();

$startAddress = 12288;

$registers = [
    Types::toInt16(10), //000a as word
    Types::toInt16(-1000), //hex: FC18 as word
    Types::toInt32(2000), //dec: 2000 -> hex: 7d00 is as 2 word 7D00 0000
];
$unitID = 1;
$packet = new WriteMultipleRegistersRequest($startAddress, $registers, $unitID); // NB: This is Modbus TCP packet not Modbus RTU over TCP!
echo 'Packet to be sent (in hex): ' . $packet->toHex() . PHP_EOL;

try {
    $binaryData = $connection->connect()
        ->sendAndReceive($packet);
    echo 'Binary received (in hex):   ' . unpack('H*', $binaryData)[1] . PHP_EOL;

    /* @var $response WriteMultipleRegistersResponse */
    $response = ResponseFactory::parseResponseOrThrow($binaryData);
    echo 'Parsed packet (in hex):     ' . $response->toHex() . PHP_EOL;
    echo 'Registers count written parsed from packet:' . PHP_EOL;
    print_r($response->getRegistersCount());

} catch (Exception $exception) {
    echo 'An exception occurred' . PHP_EOL;
    echo $exception->getMessage() . PHP_EOL;
    echo $exception->getTraceAsString() . PHP_EOL;
} finally {
    $connection->close();
}