Sending bytes to serial port using Nodejs

Question

Sending bytes to serial port using Nodejs

I am planning to do a POC on serialport communication using NodeJs. I googled and found the "serialport" module for Nodejs. I have C# code which writes the data to serial port in byte datatype format. I would like to try the same using NodeJs. The C# code has the following value in the byte[] array

5 170 85 250 0 86 0 3 158 0

Could anyone please tell me how to achieve this using NodeJs's serialport module.

Raaj

node.js
serial-port
node-serialport

Answer 1

Finally I was able to figure it out. Just create a buffer() variable (as mentioned in the documentation) and add those bytes to it. Write it to the serial port. Below is the chunk which worked for me,

var buffer = new Buffer(10);
buffer[0] = 0x05;   
buffer[1] = 0xAA;  
buffer[2] = 0x55;  
buffer[3] = 0xFA;   
buffer[4] = 0x00;   
buffer[5] = 0x56;
buffer[6] = 0x00;
buffer[7] = 0x03;
buffer[8] = 0x9E;
buffer[9] = 0x00;

var com = new SerialPort(COM1, {
    baudRate: 38400,
    databits: 8,
    parity: 'none'
}, false);

com.open(function (error) {
            if (error) {
                console.log('Error while opening the port ' + error);
            } else {
                console.log('CST port open');
     com.write(buffer, function (err, result) {
                if (err) {
                    console.log('Error while sending message : ' + err);
                }
                if (result) {
                    console.log('Response received after sending message : ' + result);
                }    
            });
       }              
    });