var Serial = require("serialport");
var port = new Serial("COM3", {
    baudRate: 9600,
    dataBits: 7,
    stopBits: 1,
    parity: 'even',
    autoOpen: true
});
port.on("open", function () {
    console.log('open');
});
port.on('data', function (data) {
    console.log(data);
});

checksum用

function checkSum(buf) {
    var cs = 0;
    for (var i_1 = 1; i_1 < buf.length - 2; i_1++)
        cs += buf[i_1];
    var rr = (cs & 0xFF).toString(16);
    return "0".repeat(2 - rr.length) + rr;
}