Nodejs serialport - doesn't fire from RFID tag

Hi

I'm trying to create a Node app that will listen to the serial port. The idea is that I scan an RFID tag and I can read the value.

I have the following BrightSign:
Model: XT1144
Boot Version: 7.1.42
BrightSign OS Version: 8.5.33

I have a Nexmosphere XM-350 (with an XR-DR1 and XR-C10 attached) plugged into the serial port. I know this isn't a Nexmosphere forum, just giving as complete a picture as possible). This setup basically reads RFID tags.

I've followed this guide as closely as possible:
https://github.com/brightsign/bs-node-serialport

And here is my code:

const SerialPort = require('@serialport/stream')
const ByteLength = require('@serialport/parser-byte-length');

function main() {
  const BrightSignBinding = require('./bs-binding');
  SerialPort.Binding = BrightSignBinding;

  let path = '/dev/ttyS0';

  const options = {
    path: path,
    port: 0, // Port 0, 3.5mm Serial/RS232, Port 2, USB Serial
    baudRate: 115200, // Update to reflect the expected baud rate
    dataBits: 8,
    stopBits: 1,
    parity: "none",
    autoOpen: false,
    module_root: '/storage/sd' // Source for where serialport will look for the underlying module
  }

  let port = new SerialPort(path, options);
  let parser = port.pipe(new ByteLength({length: 1}));

  port.open(function (err) {
    if (err) {
      return console.log('Error opening port: ', err.message)
    }
    console.log(`connected to ${path}, isOpen: ${port.isOpen}`);

    // Transmitter
    port.write('abc', function(err) {
      if (err) {
        console.log(err);
        return console.log('Error on write: ', err.message)
      }

      console.log('message written')
    })

  });

  // Receiver
  parser.on('data', function(data) {
    console.log("Parsed data: " + data);
  });

  // Open errors will be emitted as an error event
  port.on('error', function(err) {
    console.log(err);
    console.log('Error: ', err.message)
  })

  console.log(`After serialport creation`);
}

window.main = main;

In the log, I can see the following:

[   31.964] [INFO]   [source file:///sd:/index.html:7]: After serialport creation 
[   31.965] No inversion GPIO
[   31.967] [INFO]   [source file:///sd:/index.html:7]: connected to /dev/ttyS0, isOpen: true 
[   31.971] [INFO]   [source file:///sd:/index.html:7]: message written

However when I scan an RFID, although an LED changes on the Nexmo kit (which I assume means a signal has been sent) I don't see any message in the BrightSign log.

Has anyone got experience with this sort of thing? I'm not sure how I can even test the serial port.

Nodejs serialport - doesn't fire from RFID tag

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