electron app nodejs Serial port -- 2

I Have Dev an electron serial app witch have : async open 3 serial port . When serials open 1 Serial parse data to renderer js file 2 the renderer js file is link to main [login to view URL] electron window by parsing data to many function 3 I have already create a child window but i can not parse the main index console to child html page async function listSerialPorts() { await [login to view URL]().then((ports, err) => { if(err) { [login to view URL]('error').textContent = [login to view URL] [login to view URL](err) return } else { [login to view URL]('error').textContent = '' } //[login to view URL]('ports', ports); //später löschen if ([login to view URL] === 0) { [login to view URL]('error').textContent = 'No ports discovered' [login to view URL]("No ports discovered") } for( let i=0;i < [login to view URL];i++) { [login to view URL] =[login to view URL] + "<option value = "+ ports[i].path+ ">" + ports[i].path + "</option>" [login to view URL]('comPorts').innerHTML = [login to view URL]; [login to view URL]('comPorts1').innerHTML = [login to view URL]; [login to view URL]('comPorts2').innerHTML = [login to view URL]; } [login to view URL] = []; }) [login to view URL] = e =>{ [login to view URL] = [login to view URL]("comPorts").value [login to view URL] = new SerialPort({path:[login to view URL],baudRate:[login to view URL] }) [login to view URL] = [login to view URL](new ReadlineParser({ delimiter: '\r\n' })) [login to view URL] = true [login to view URL] = false DataReceived() init() //GPS()// } function DataReceived() { let newValue =''; [login to view URL]('data',function(data){ newValue = data; var bar= newValue; bar1 = parseInt(bar); [login to view URL](newValue); //getValue(data); }); } mains .js const electron = require('electron') const app = [login to view URL] const BrowserWindow = [login to view URL] const path = require('path') const url = require('url') let mainWindow function createWindow() { mainWindow = new BrowserWindow({ width: 1050, height: 1080, frame: true, webPreferences: { nodeIntegration: true, contextIsolation: false, enableRemoteModule: true, } }) [login to view URL]([login to view URL]({ pathname: [login to view URL](__dirname, '[login to view URL]'), protocol: 'file:', slashes: true })); let child= new BrowserWindow({parent:mainWindow}) [login to view URL]([login to view URL]({ pathname: [login to view URL](__dirname, '[login to view URL]'), protocol: 'file:', })); [login to view URL]() [login to view URL]([login to view URL]({ pathname: [login to view URL](__dirname, '[login to view URL]'), protocol: 'file:', slashes: true })); // Open the DevTools. [login to view URL](); [login to view URL]('closed', function() { mainWindow = null }) } [login to view URL]('ready', createWindow) [login to view URL]('window-all-closed', function() { [login to view URL]() }) [login to view URL]('activate', function() { if (mainWindow === null) { createWindow() } });