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index.js
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index.js
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const SerialPort = require('serialport');
const PORT_ADDRESS = 'COM9';
let port = new SerialPort(PORT_ADDRESS, {
baudRate: 19200
});
port.on("open", function () {
console.log(`${PORT_ADDRESS} is openned`);
setInterval(function () { requestLevel(port) }, 2000);
port.on('data', function(data) {
console.log('data received: ' + data.toString('hex'));
destruct_data(data.toString('hex'));
console.log();
});
});
function requestLevel(port) {
port.write(new Buffer("3101066C", "hex"), function(err, results) {
if(err) console.log('err ' + err);
if(results) console.log('results ' + results);
});
// port.write(new Buffer('DO','ascii'), function(err, results) {
// console.log('err ' + err);
// console.log('results ' + results);
// });
}
function destruct_data(data = 0) {
if (data === 0 || data.substring(0, 2) != "3e") return;
let address = data.substring(2, 4);
console.log(`Network address: ${address}`);
let operation = data.substring(4, 6);
if (operation === "06") { console.log(`Operation: 06 (One time data request)`); } else { console.log(`Operation: ${operation}`); }
let temp = parseInt(data.substring(6, 8), 16);
console.log(`Temperature: ${temp}`);
let level = parseInt(data.substring(10, 12) + data.substring(8, 10), 16);
console.log(`Fuel Level: ${level}`);
let freq = parseInt(data.substring(14, 16) + data.substring(12, 14), 16);
console.log(`Frequency: ${freq}`);
}