This function designed for those old vending machines don't support DEX but support MDB cashless.
#NOTES:
It only works for those vending machines only have cashless payment, as our device cannot record cash sales info via MDB bus.
To setup cashless 2in1 DTU work in Self Dex mode.
1: Make sure the machine works with our cashless only, no coin mech
and note reader
2: Self DEX mode setup instruction
1) After turn on, when see "Tap or swipe card", press and hold MODE
button on the dtu for 3 seconds and then release it.
2) On the reader then will show "1 APN Setup", press RESET button to
navigate until you see
7 MDB Master
Self DEX: on
3) Press Restock button to change to "Self DEX: off " and then press
again to "Self DEX:ON"
4) Press Collection button to save it.
5) Press Mode to exit to "Tap or swipe card"
6) Then make a purchase on with card on each selection
7) Press and hold the collection button to restock the machine. Then
the dex file will report properly.