Of course it needs to be cared for. For vending machine manufacturers, just an order has been completed. For users, the real value lies in the continuous and reliable operation of the vending machine, whether there is a reliable after-sales guarantee and easy after-sales accessories. The payment system is the most critical component of the vending machine, because it is particularly important to choose a common payment device and payment accessories. Therefore, MDB is of great significance as a global payment interface compared to serial ports and other non-standard interfaces. Users can purchase suitable accessories that meet the standard agreement by themselves at a later stage. And the supplier of key parts is also very important, for example, Waferstar has been registered and has been continuously developing for 18 years, and what better than 18 years of research and development history can prove the quality of the product and the recognition of the market. Therefore, many customers specify the MDB-RS232 adapter of waferstar when ordering vending machines from manufacturers.

Yes,MDB-RS232 is used to connect the MDB payment device to RS232 interface VMC board,for example,PC, android board ,Raspberry pi board. and you can use the RS232 VMC board to send the command to control,for example enable,disable the MDB payment device. and also when payment device a payment value,then will report to VMC automatically.

Of course. More than just NAYAX's card readers. Other brands, as long as they are MDB interface, follow the MDB protocol and can be used.

Yes, of course,NAYAX, PAX IM30 and so on, these applications are very stable. Many customers use it.

No. The RS232 serial port of MDB-RS232 adapter is connected to the vmc board. The VMC board control the MDB payment device through the RS232 port, that is, the MDB adapter and the vmc board together act as the host machine.
Your requirement is that the MDB adapter and the payment module work together as a payment module, acting as slaves to the existing NECTA coffee vending machine. So you need to use "RS232-MDB", not "MDB-RS232".
For MDB-RS232 adapter,you can learn more from: http://www.mdb-rs232.com
For RS232-MDB adapter,you can learn more from: http://www.rs232-mdb.com

Of course, on our website: http://www.mdb-rs232.com, we will also provide a file of the control process of Bill Recycler for customers' reference.

We currently only provide Test software under PC Windows system. And our Raspberry Pi version of the MDB adapter board, there is also an interface that can be connected to the PC Windows system through the USB to serial adapter we provide with sample kits for testing. This can easily test, control, and familiarize yourself with the MDB protocol, control process, data format, etc. through the PC test sofware. Then you can plug our MDB board into the GPIO bus of the Raspberry Pi, and easily carry out program design and serial communication design on Android, Raspberry Pi and other devices.

Yes, our MDB adapters support the latest MDB protocol. Undergo rigorous compatibility testing before release. Moreover, our new versions will remain compatible with the previous version, which is convenient for customers to upgrade their vending system in the future.

1. Select a Android main board or PLC or Even Raspberry pi to work as the vending machine master board.
2. Order a MDB-RS232 Professional version adapter box.
3. Order a MDB Interface Age verification slave device,if you don't have a real age verification device, just want to verification the function,you can order a Age verification simulator box from the waferstar company. Of course, it is best to order a standard MDB interface AGE verification device.

Waferstar has a MDB-RS232 AIR version, it has the Sleep pin output for RS-900 backload note validator application. Then user can easily use it with the DC12V battery operated machine.

MDB board Letpos can meet your requirement. It can connect the MDB coin acceptor,bill validator and Card reader,for example nayax card reader VPOS, PAX IM20 credit card reader and accept the MDB payment and output the pulse for the vending machine. Simple setting and Plug and play.

1. WAFERSTAR are a company established in 2006 with a history of 18 years. We have been engaged in the production of MDB adapters for more than 15 years. If it is an old customer, then will know our history. Years of design experience and product updates have given us rich experience in production, design, maintenance and technical support.
2. Since the system design, sales and Technical training of vending machines take a long time, we can continue to provide technical support and after-sales service for many years. If you choose a product from an unstable company, after you complete the design, the supplier company may go bankrupt, business changes, product discontinuation, product quality issues and other accidents may occur, resulting in the embarrassment that you cannot continue to buy. Or after encountering some product or technical problems, customer will never get technical support or solutions.
3. We have a competitive price. Of course, for self-service vending products, price is definitely not the most important thing, because stability is very important in unattended situations. Only then can the machine generate trouble-free benefits for customers.
4. We provide solutions and upgrades for a series of products, and our upgrades will provide compatibility. To provide our customers with good product support.

MDB是MDB/ICP协议(Multi-Drop Bus/Internal Communication Protocol)的简称，它是欧洲自动售货机制造者协会制定的一套用于协调自动售货系统的主控制器(VMC)与多个外设之间通信的协议。标准首先是由Coinco在美国可口可乐公司的指定下开发的。这个标准于1993年被NAMA组织采用;经过NAMA修订后，于1994年被EVMMA采用。第二阶段的非现金交易标准由Debitek代表NAMA开发，并于1994年被NAMA采用；EVMMA加入了一些兼容的指令后于1994年采用。MDB接口实际上是工作于9600波特率的主从型串行总线接口，所用外围设备(例如投币器、纸币器、读卡器等)均为主控制器(售货机控制器-VMC)的从机。所有外围设备与VMC之间的通信方式都一致。

MDB协议中规定的地址是由一个地址字节的高五位进行分配，我们做售货机的研发，必须严格遵循地址的定义，否则机器会发生地址冲突，不具有通用性
地址定义如下：
00000xxxB (00H)     VMC保留
00001xxxB (08H)     硬币器
00010xxxB (10H)     非现金设备#1
00011xxxB (18H)     通信网关地址
00100xxxB (20H)     显示地址
00101xxxB (28H)     电能管理系统
00110xxxB (30H)     纸币器
00111xxxB (38H)     保留为以后的标准周边设备用
01000xxxB (40H)     USD设备（通用从机设备）#1
01001xxxB (48H)     USD设备（通用从机设备）#2
01010xxxB (50H)     USD设备（通用从机设备）#3
01011xxxB (58H)     硬币找零退币器或者硬币管1
01100xxxB (60H)     非现金设备#2
01101xxxB (68H)     年龄验证设备
01101xxxB (70H)     硬币找零退币器或者硬币管1
01111xxxB (78H)     保留为以后的标准周边设备用
. . .
. . .
. . .
11011xxxB (D8H)     保留为以后的标准周边设备用
11100xxxB (E0H)     实验性设备#1
11101xxxB (E8H)     实验性设备#2
11110xxxB (F0H)     售货机专用外围设备#1
11111xxxB (F8H)     售货机专用外围设备#2

MDB协议的Always idle

Always Idle和 Authorization是MDB非现金支付设备的两种工作模式。 这些是指无现金支付设备在选货和刷卡时间方面的工作流程。请在下表中找到不同的流程差异。

Always Idle
1-用户在自动售货机上选择商品
2-无现金支付终端要求产品价格
3-用户刷卡即可付款。
4-机器分配产品并向终端确认交易，而无需用户进行任何必要的操作。
Authorization First
1–无现金支付终端正在请求预定义的授权金额。
2-用户刷卡预授权（预留）授权金额。
3-用户在自动售货机上选择产品。
4-自动售货机将商品价格发送到终端。
5-终端调整价值以向客户收费，并向自动售货机确认，而无需用户采取任何必要行动。
6-自动售货机在用户无需采取任何必要行动的情况下配送产品并确认交易。

1. Allows reporting the item number dispensed to the cashless device.
2. New “Remote Vend” provides a method that allows the MDB cashless protocol to run a product dispenser on the VMC. For example, a mobile phone application can select products on the phone screen without touching vending machine buttons / screen.
3. New “Basket / Partial Refund” feature allows multi-vends in the MDB Cashless session in a single transaction (i.e.; single card touch). It informs the cashless device about each dispensed product (providing item number of each).
4. New “Basket / Partial Refund” feature also allows partial refunding for cases when a part of product was not dispensed (i.e.; multi-vend product not dispensed, liquid dispensing machine with stop button, etc).
5. New “Coupon” feature provides a method to accept coupons in the MDB cashless protocol. For example, prepaid coupons could be scanned to allow the cashless device to insert prepaid credit in addition to standard cards with credit holding. Another example would be a QR-code for free vend of the specified product.
6. Allows the VMC to take into consideration card information (Funds available, Payment media ID, Type of payment) in case of selection first.
7. Adds the enhanced item number information. Adds the Item Number Dispensed and the EVA-DTS PA101 field for item Selected and Dispensed to the 7.4.7 Vend Success and 7.4.10 Cash Sale commands.
8. Adds a new “Mixed Vend Flags” byte to the CASH SALE command.

Every time we have a special product demand, Waferstar is always able to provide us with the best solution.