无法使用Node.js读取串行端口

Question

我已经使用Node.js创建了一个网络服务器并进行了表达。我想通过单击一个按钮来读取一些数据到串行端口。写作有效，阅读无效。我没有任何错误。

这样我就可以看到与Putty一起发送的日期。但是read.js没有显示任何内容。

////index.js
const express = require('express');
const path = require('path');
const socket = require('socket.io');
const SerialPort = require('serialport');
const writeToPort = require('./write');
const readPort = require('./read');
const Readline = require('@serialport/parser-readline');

const app = express();

app.use(express.static(path.join(__dirname, 'public')));

const PORT = process.env.PORT || 80;

var server = app.listen(PORT, () => console.log('Server started on port: 
'+PORT));

var io = socket(server);

io.on('connection', function(socket){

console.log('made socket connection');

// Port open
const wPort = new SerialPort('COM1');
const rPort = new SerialPort('COM2');

readPort.read(rPort);

// 'direction' event
socket.on('direction', function(data){

    // Write to port
    writeToPort.write(wPort, data);
});
});


////read.js   
const SerialPort = require('serialport');
const Readline = require('@serialport/parser-readline');

exports.read = function(_port){
console.log('Reading...');
const port = _port;
const parser = port.pipe(new Readline({ delimiter: '\r\n' }));

parser.on('data', function(data){
    console.log('Read: '+data);
});
}