Bus protocol
MDB
Converters and gateways
QRport MDB
MDB fiscalization gateway and MDB ↔ RS-232 converter
- MDB bus
- Cash + cashless
- MDB ↔ RS-232
Sits on the MDB bus of an existing machine and fiscalizes every device on it — bill validators, coin changers and contactless readers — for both cash and cashless payments. The same board works as an MDB ↔ RS-232 converter, so a machine with an MDB bus can talk to equipment that only speaks serial.
Price on request
Price per unit, VAT excluded. Batch pricing on request.
Pinouts, wiring diagrams and firmware notes are issued per board revision and sent on request.
01
Specifications
Functions
Fiscalization gateway + MDB ↔ RS-232 converter
Fiscalizes devices
Bill validators · coin changers · contactless readers
Payment types
Cash and cashless
Fiscalization
Cloud fiscal receipt services
Typical applications
Coffee machines · coffee vending · any MDB vending
02
Typical applications
- Coffee machines and MDB vending that must issue fiscal receipts
- Adding cashless payment to a machine whose VMC already speaks MDB
- Bridging an MDB machine to serial-only peripherals or a host system
03
Questions we get first
Do I have to replace the machine controller?
No. QRport MDB connects to the MDB bus of an existing machine and keeps its VMC. If you want to replace the controller instead, M-VEND takes that role.
Which devices does QRport MDB fiscalize?
Every payment device on the MDB bus: bill validators, coin changers and contactless readers, for both cash and cashless payments.
What is the MDB ↔ RS-232 converter for?
It lets a machine with an MDB bus talk to equipment that only speaks serial, or to a host system. The same board does this alongside fiscalization.
Which machines is QRport MDB used in?
Coffee machines, coffee vending and any vending machine with an MDB bus that has to issue fiscal receipts or bridge to serial equipment.
Where can I read how MDB works?
The documentation section has an MDB explainer: master-slave topology, the serial frame format, peripheral addressing and how a cashless device joins the bus.
How do I get the pinout and a quote?
Pinouts, terminal assignments and firmware notes are issued per board revision and sent on request. Send the machine model, the payment devices and the quantity through the form on this page.
Order this board
Tell us the board, the quantity and where it ships. We reply with the invoice, the lead time and the documentation for the revision you get.
