代码拉取完成,页面将自动刷新
同步操作将从 不败少龙/modbus-tcp-client 强制同步,此操作会覆盖自 Fork 仓库以来所做的任何修改,且无法恢复!!!
确定后同步将在后台操作,完成时将刷新页面,请耐心等待。
<?php
use ModbusTcpClient\Packet\ModbusFunction\ReadInputRegistersRequest;
use ModbusTcpClient\Packet\ModbusFunction\ReadInputRegistersResponse;
use ModbusTcpClient\Packet\RtuConverter;
require __DIR__ . '/../vendor/autoload.php';
if (stripos(PHP_OS, 'WIN') === 0) {
echo 'This example can not be run in Windows!' . PHP_EOL;
exit(0);
}
$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 {
$device = '/dev/ttyUSB0';
$fd = fopen($device, 'w+b');
$sttyModes = implode(' ', [
'cs8', // enable character size 8 bits
'9600', // enable baud rate 9600
'-icanon', // disable enable special characters: erase, kill, werase, rprnt
'min 0', // with -icanon, set N characters minimum for a completed read
'ignbrk', // enable ignore break characters
'-brkint', // disable breaks cause an interrupt signal
'-icrnl', // disable translate carriage return to newline
'-imaxbel', // disable beep and do not flush a full input buffer on a character
'-opost', // disable postprocess output
'-onlcr', // disable translate newline to carriage return-newline
'-isig', // disable interrupt, quit, and suspend special characters
'-iexten', // disable non-POSIX special characters
'-echo', // disable echo input characters
'-echoe', // disable echo erase characters as backspace-space-backspace
'-echok', // disable echo a newline after a kill character
'-echoctl', // disable same as [-]ctlecho
'-echoke', // disable kill all line by obeying the echoprt and echoe settings
'-noflsh', // disable flushing after interrupt and quit special characters
'-ixon', // disable XON/XOFF flow control
'-crtscts', // disable RTS/CTS handshaking
]);
$sttyResult = exec("stty -F ${device} ${sttyModes}");
if ($sttyResult === false) {
echo 'stty command failed' . PHP_EOL;
exit(1);
}
echo 'RTU Binary to sent (in hex): ' . unpack('H*', $rtuPacket)[1] . PHP_EOL;
fwrite($fd, $rtuPacket);
fflush($fd);
$binaryData = '';
$start = microtime(true);
do {
// give sensor (5ms) some time to respond. SHT20 modbus minimal response time seems to be 20ms and more
usleep(5000);
$binaryData = fread($fd, 255);
} while ($binaryData === '');
$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 $exception->getTraceAsString() . PHP_EOL;
} finally {
fclose($fd);
}
此处可能存在不合适展示的内容,页面不予展示。您可通过相关编辑功能自查并修改。
如您确认内容无涉及 不当用语 / 纯广告导流 / 暴力 / 低俗色情 / 侵权 / 盗版 / 虚假 / 无价值内容或违法国家有关法律法规的内容,可点击提交进行申诉,我们将尽快为您处理。