Please note that the SerialPort API has changed between versions.
The one on node-serialport-omega2 is version 3. Which is why it might get a bit confusing if you look at the latest docs from the original serialport repo instead of the omega2 fork of the same.
Please refer to the docs on the omega2 fork. They should work as expected.var SerialPort = require('serialport'); // original fork (v5) var port = new SerialPort('COM1'); var SerialPort = require('serialport').SerialPort; // omega2 port (at v3) var port = new SerialPort('COM1');