serialport串口通信

serialport串口通信

npm包serialport

/*
 * @Descripttion: 
 * @Author: yizheng.yuan
 * @Date: 2020-03-02 09:38:54
 * @LastEditors: yizheng.yuan
 * @LastEditTime: 2020-04-10 18:18:40
 */

// console.log('SerialPort:',SerialPort)

// if(SerialPort){ 

//     SerialPort.close();

// }

var portName = 'COM2'; //定义串口名
var SerialPort = require('serialport');


// list()弃用回调形式了，已经采用promise返回了，所以这里要用promise接收数据
let rel = SerialPort.list();
let com,vid,pid;
// [ { path: 'COM5',
//     manufacturer: 'Prolific',
//     serialNumber: '5&79ce5a3&0&2',
//     pnpId: 'USB\\VID_067B&PID_2303\\5&79CE5A3&0&2',
//     locationId: 'Port_#0002.Hub_#0001',
//     vendorId: '067B',
//     productId: '2303' } ]
rel.then(
    data=>{ 
        console.log('成功，串口列表为data22:',data);
        // for(let i=0;i<data.length;i++){
        //     if(data[i].vendorId=='067B'){
        //         com = data[i].path;
        //         vid = data[i].vendorId;
        //         pid = data[i].productId;
        //     }
        // }
        com = data[1].path;
        vid = data[1].vendorId;
        pid = data[1].productId;
        console.log('###-get-:com,vid,pid:',com,vid,pid);
        connectPort(com)
    },
    error=>{console.log('失败err:',error)}
)



function connectPort(com){
    let spt = new SerialPort( //设置串口属性
        com, {
          baudRate: 115200,  //波特率
          dataBits: 8,    //数据位
          parity: 'none',  //奇偶校验
          stopBits: 1,  //停止位
          flowControl: false ,
          autoOpen:false //不自动打开1
        }, false);
    spt.open(function(error){
      if(error){
        console.log("打开端口"+portName+"错误："+error);
      }else{ 
      console.log("打开端口成功1，正在监听数据中");
        spt.on('data',function(data){
           console.log('1返回的11----接收串口数据data:',data.toString());
        })
      }
    });

    console.log('--尝试往串口发数据1--');
    function callbackFun(){
        console.log('write--success2')
    }
    function writeAndDrain (data,callback) {
        console.log('write:',data)
        spt.write(data, function () {
            spt.drain(callback);
        });
    }
    setInterval(()=>{
        let data="abc\r\n"
        let data1='{"msg":"method", "method":"system.get_channel", "params":[{"args": [], "kwargs": {}}], "id":"xxxxx", "devID":"xxxx" }\r\n';
        writeAndDrain(data1,callbackFun)
    },3000)

}


// var SerialPort = require('serialport');

// SerialPort.list(function (err, ports) {

//   ports.forEach(function(port) {

//     console.log(port.comName);

//     console.log(port.pnpId);

//     console.log(port.manufacturer);

//   });

// });