nodejs串口通信（基础）

let bodyParser = require('body-parser');
let express = require("express"),
    app = express();

let port = 8686;

app.listen(port, () => {
    console.log(`server is success,listen on ${port}`);
});
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:false}));
app.use(express.static('./static'));

//引入串口通信的模块
let SerialPort = require('serialport');
//打开一个串口
let serialPort = new SerialPort('COM5', {
    //波特率
    baudRate : 115200,
    autoOpen:false
});

app.post("/sendMsg",async (req,res)=>{
    let {msg=''} = req.body;
    //前端发送请求，后端接收到数据msg后，通过串口进行写入
    serialPort.write(msg);
});


//连接串口后
serialPort.open(function (err) {
	//连接串口后执行此方法
    console.log('IsOpen:',serialPort.isOpen)
    console.log('err:',err)
})

//指令监听
serialPort.on('data',async function (data) {
	//接收到串口传递来的数据后，对数据处理
    console.log('data received: '+data)
})
//错误监听
serialPort.on('error',function (error) {
    console.log('error: '+error)
})