What is MDB and how is it integrated in vending machines?



Vending Machines



What is MDB and how is it integrated in vending machines?

MDB stands for "Multi Drop Bus". In connection with vending machines, this refers to a connection technology for peripheral devices (coin validators, banknote readers, etc.). The MDB standard of the NAMA was adopted in Europe by the EVA and describes the electrical interface, as well as the serial and logical protocol.

The MD Bus is anything but modern. The MDB's electrical signal is a kind of "current loop" that communicates with 9 bits (also the higher protocol uses this ninth bit). A modern PC or controller can't do anything with it. An MDB interface helps here. With this, all possible MDB devices can be connected and addressed via a standard USB port.

Nowadays, there are also coin validators or credit card terminals with other interfaces. Nevertheless, it still makes sense to use the MDB interface. It's the international "standard", by which the devices of different manufacturers are mostly compatible with each other and the connection via MDB is often inevitable for upgrading an existing machine.

We at Qibixx originally developed our MDB USB interface for our own "machine solution", with which we can add a mobile payment system (TWINT, for which we were permitted to build the hardware) to the usual vending machines. This experience is now also available to you as a solution for your MDB interfacing applications, packed in a stylish aluminium housing.

Special versions with 4G/LTE modem and intelligence, WiFi connection etc. are available on request.

A brief overview of a typical vending machine system:

    1. The "VMC" (Vending Machine Controller), the central control unit that also controls the electromechanical system. The payment systems are connected via the MDB interface.
    2. One or more authorization equipment that accept money or credit (readers, coin validators, etc.).
    3. In addition, loggers, memories, etc. can be connected

Where to use the Qibixx MDB USB device?

The device was originally developed to be used together with a small Linux controller (our Linulus) a "cashless device" and to accept TWINT mobile payments for the machine. The Qibixx MDB Interface works as a "slave" (graphic:2), and communicates with the VMC via the MDB bus. It's connected in parallel with any other "readers" that may be present.

What if I want to build a modern vending machine and need a central control and a coin validator?

In this case the MDB USB interface from Qibixx is connected to the central controller via USB. In this way the controller can communicate easily with all MDB peripherals (from coin validators to credit card terminals) in the simplest manner. Of course, we can also supply a suitable controller (Linulus), but you can also use a Raspberry Pi or a Windows PC.

Your specific application is not listed? Ask us, we have more - and with engineering and know-how based in Switzerland, we are also able to build the necessary equipment for you quickly and competently. For example, the MDB interface can be equipped with a 4G communication capability so that you can accept payments to the machines anywhere in the country, release single machines and so on. Statistical and monitoring functions are also programmable. Contact us!

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