Shenzhen Rakinda Technologies Co., Ltd.

With the popularity of mobile payments, nowadays many young people go on a trip only with mobile phone, because they don’t need to carry cash.When they want to buy a drink or snack in vending machine, they only put the mobile phone in front of the windows of barcode reader from vending machine, and then they will get their drinks or snacks after they paid.

When people choose their own drinks or snacks at a self-service vending machine, they can turn on their mobile APP “third-party payment software” from mobile phones, such as Alipay or wechat, to display the screen payment QR code from their mobile phone. Finally, people align the barcode scanning window for scanning and they can complete the payment.

So how does the barcode scanner module connect to a vending machine through an MDB protocol?
The barcode scanner’s common interface is USB or RS232 serial port.So when you want to achieve the barcode scanner connect with vending machine,
it must be through the MDB converter and the backstage code that modifies the MDB’s communication protocol.

What is MDB protocol?
MDB (ICP) protocol, is by the national association for the automatic machinery sales (NAMA) and the European Association for vending machine (EVA) related members formulation, is a coordination of vending machines for main controller (VMC) and the communication protocol between multiple peripherals.

In fact, MDB interface work with the 9600 baud rate master-slave type serial bus interface and peripheral equipment (such as COINS, currency detector, card reader, etc.) are primarily controller (traditionally called vending machine controller – VMC). All peripheral devices and VMC communicate in the same way.
The serial number format of the MDB protocol is 1 start bit, 8 data bits, 1 way bit and 1 stop bit, the total is 11 bits.The way bits are placed 0 or 1 in different ways.

What is a good barcode reader to recommend for the vending machine?

RD4500R or RD4600 2d barcode scanner has a interface is USB or RS-232.It reads printed or screen barcodes with 5 to 10mil precision. Its light source is LED white light and the Industrial grade is IP65. At the same time, small streamlined design makes it perfect for embedding in the various types of self-service machines, like vending machine.