The G120 has a Wiegand interface.

Wiegand is a common interfaced used by RFID readers. So it means many readers can be simply connected to the G120, and read cards that the DM RFID reader may not be able to read.

The DM RFID reader reads 125kHz EM4001 cards and fobs. Other common access cards that sites/business may use are HID (common) or MiFare. 

So if a customer already has allocated access cards to their staff, they can still be used if a suitable reader is found. 

Read more about this on our site!

So how do I source the right reader?

In short, you need to find a reader that reads the type of card/fob in use, and outputs Wiegand. 

Check the specification, that it has a Wiegand Interface. 

And then check the card types it reads. 

That is pretty much all there is to it. 

Though sometimes keypads like to do weird things, but often it is hard to know until you have it in your hands anyway..

The other considerations are:

- Cost

- Form Factor

- Mounting

- How it is powered.

There is 4V available on pin 3 on the wiring harness (purple wire of 4 way driver ID connector on G120 harness)

But many Wiegand readers often require a higher voltage to operate, so they will need to be powered separately. 

It is generally easiest just to connect to where you are powering the G120 from. 

What are some common pitfalls?

These can be hard to spot beforehand, but a few issues or areas to consider that have cropped up in testing keypads

  • We have seen some keypads that send through data for every key press (and don't wait for the complete code). So trying to enter "12345" sends through each in sequence i.e. 1, 2, 3, 4, 5. There is no way around this and another keypad needs to be sourced.

  • Wiegand encoding must be accounted for. "12345" when pressed on the keypad won't turn up as this. It is typically encoded into the Wiegand protocol and ends up looking different by the time it makes it to TG. So the "TG Version" must be what is entered in the Driver List. This is easy to work around by:
    • Simply enter the desired code - i.e. 12345 - then check the Telemetry in TG for the driver code. Paste what comes through into the driver list, and

Can you recommend any?

Below are some Wiegand readers we have seen in use. They have not been extensively tested by DM but can give an idea of what to look for. 

  1. RFID Access Card Reader (Jaycar Australia)
    Tested by DM, works and reads HID cards.

  2. Digital Keypad with RFID (Jaycar Australia) - LA5353

NB - Key presses/tag reads are encoded so you will not see your code in TG exactly as it is entered - i.e. the code "111111" will appear as 1A00D903C0 in telemetry. 

If we know the encoding we can work out what codes to add to the driver list. 

A javascript calculator is attached that will convert as needed.