RS232-MDB® (PC2MDB®) For

Easy Vending Machine Cashless Payment Design

A simple yet powerful way to connect the RS232 interface device including PC,PLC,Raspberry pi or Android board to the existing vending machine.and working as the slave cashless payment device.

About The RS232-MDB(PC2MDB) Adapter box


Smart cashless payment adapter box for vending machine!

Smart Designed RS232-MDB Adapter Box

The vending industry standard NAMA Multi-Drop Bus (MDB) may now be interfaced a PC to the existing mdb interface vending machine with the RS232-MDB. The RS232-MDB allows PC computer,android maini board, Raspberry pi, RS232 pos and all other RS232 controllers to be connected to the vending machine.Follow WAFERSTAR's quick use guide and send some simple and necessary instructions to realize cashless payment. It's easy to get started and complete the design.

Conforms to all NAMA MDB specification and is compatible with any MDB compliant vending machine. Hardware interface comes with cables,user's guide and user's protocal.

RS232-MDB(PC2MDB)'s Main Features


Happy to select and use our MDB box. It is very easy to start!

We Design, Manufacture and Sale


Hot-selling products from WAFERSTAR related to vending machines!

How the RS232-MDB Works? Play And Watch!

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What Our Users Say’s


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RS232-MDB and Relative product


We have a series of related products available!

Basic
RS232-MDB

COM Version

  • RS232 interface
  • Easy for cashless module design
  • Long-term application guarantee
  • Simple and Professional
  • Online Skype Service
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USB
RS232-MDB

USB Version

  • Fully Compatible
  • FT232RL USB chip on board
  • Comprehensive USB driver support
  • Simple and Professional
  • Online Skype Service
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Raspbery Pi
RS232-MDB

Raspberry Pi Version

  • Plug on the Raspberry PI
  • Well-designed plastic case
  • Communicate through RXD and TXD on GPIO
  • Output DC5V for Raspberry PI
  • Online Skype Service
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MDB-RS232
MDB-RS232

For Vending machine design

  • Different from RS232-MDB
  • Simple, reliable and easy to use
  • Working as master MDB module
  • Simple and Professional
  • Online Skype Service
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Download the Files


Download the manual and Start to order the samples to test.Believe WAFERSTAR will give you a surprise start!

Frequently Questions and Answers


You can find the questions and answers of your interest here!


    MDB stands for "Multi-Drop Bus" and is a protocol developed by vending machine industry. The "Multi-drop Bus" (MDB) protocol is not compatible with the standard RS232 PC protocol and therefore a hardware and software interface is necessary.
    The RS232-MDB is a microprocessor controlled hardware interface with embedded firmware that converts the MDB protocol to an RS232 protocol and also performs the necessary voltage conversion.
    RS232-MDB also undertakes a lot of necessary real-time communication with the vending machine. This allows users to develop cashless payment devices very simply and quickly. There is no need to study too many communication protocols.
    The first purpose of purchasing this device is to develop a cashless payment device that can communicate with the vending machine, make payments, and allow dispensing the goods, so as to realize unattended automatic payment and sales.
    You can choose any RS232 device as a payment device, such as an existing POS machine (of course, you must have the ability to program on the POS machine, communicate with the RS232-MDB box according to the protocol and send and receive the data). You can also choose a computer, an Android motherboard, or a Raspberry Pi motherboard as a payment device. As long as it is a serial communication device.
    Next, you only need to use a simple serial port tool (Also can be provided by WAFERSTAR company) according to the instructions in the Quick User Guide, and then you can manually send data to pay and allow dispensing. You can be surprised to find that with the help of the RS232-MDB box. Realizing cashless payment is so simple.
    Of course, the hardware connection is relatively simple. A professional hardware engineer is not necessarily required. However, you need to have a professional software engineer to complete the subsequent software development work. At the same time, you also need to research and read the MDB standard protocol so that you can fully control the equipment and develop a higher quality software system.
    After purchasing WAFERSTAR's RS232-MDB, we will provide an easy-to-understand Quick user guide. A PC testing software will also be provided. In this way, after you prepare the motherboard and accessories, you can directly test and realize the cashless payment device. Such as add the credit value payment to the vending machine, approve the vend etc.
    Of course, if you need the source code of the PC test software, you need to purchase the SDK. The SDK includes more detailed and Quick-response technical support (this is the key point), two USB-to-serial adapters and the source code of the test tool software.
    After purchasing the SDK, our technical staff will assist you to understand the MDB protocol, analyze the errors in the receiving and sending of MDB commands, including subsequent understanding of the protocol. It is equivalent to a small amount of expense for you and one more technical guidance of the MDB protocol to help you quickly understand and complete the development.
    Normally, if your device has a RS232 port, you can directly choose the box with the RS232 interface. If your PLC or android board does not have a RS232 port, but only has a USB interface, you can choose the USB interface. Plug our USB box into your device, it will generate a virtual serial port on the device (need to install the necessary driver, our USB chip is FT232RL, you can directly search for the driver on GOOGLE, download and install).
    If you are a Raspberry Pi, you can directly purchase the Raspberry Pi version, then you can directly plug it into the Raspberry Pi motherboard and communicate through RXD and TXD on the GPIO bus. At the same time, our board will also provide the power supply to the Raspberry Pi through the VDD on the GPIO, so your Raspberry Pi does not need additional power supply.
    Sometimes, the interface on your motherboard may be a TTL serial port. We can also customize the characteristic TTL interface communication for you.

    In WAFERSTAR's online shop, there is an MDB-RS232 adapter. There is also an RS232-MDB adapter. Some people do not read the product description carefully, or are not sure what they need, it is easy to order mistakes. Please read the following carefully. If you are not sure, you can also contact us before ordering.
    MDB-RS232 is used to connect the MDB bill acceptor,coin validator,cashless payment device to computer. then you will design the Software that will run in the PC and work as the master main vending controller. For example,you develop the kiosk information machine. then you need to connect the MDB bill acceptor,coin validator to computer,but you don't know how to connect the MDB interface payment device to computer, because computer only has the RS232 port, no MDB port.then you need to order the MDB-RS232 adapter (MDB2PC Adapter ).
    RS232-MDB is used to connect the pc to existing vending machine.then you will need to design the Software that will run in the PC and work as the slave cashless payment device.and then you PC will work as a cashless payment device to vending machine. For example,you want to use the PC to give payment credit to existing vending machine, or if you want to make the internet connection to the vending machine and give credit to vending machine remotely, then you need to order the RS232-MDB adapter (PC2MDB adapter ).
    From the above description, it can be seen that in fact, RS232-MDB can be used as a cashless payment device and can be connected to the MDB-RS232 device. Here MDB-RS232 is directly connected to the PC as a host device. The RS232-MDB is a kind of slave payment device which is parallel to the Bill acceptor and coin validator at the same time.
   

  • I have understood the difference, what I need is RS232-MDB. Order Samples now! .........
  •    
  • Now I understand the difference between them, what I need is MDB-RS232. I want to continue to learn about MDB-RS232..........
  • Coin simulator can help you
        We have the MDB coin validator simulator,which can help you to connect the RS232 device to vending machine,but will simulate a coin validator.
        That means our converter will work with the vending machine as a coin validator,but the coin credit can be added through RS232 interface or just simple pulse input.
        An MDB Universal Satellite Device (USD) is a vending device which lacks customary credit acceptance peripherals. As such, a USD must rely on a host vending machine controller (VMC) to establish credit sufficient to perform a vend.
        There are three USD modes
        Mode 1: VMC is used to select items to be vended from the USD and the VMC contains all pricing information. The USD receives vend requests from the VMC and reports vend success or failure. (the USD is completely controlled by the VMC)
        Mode 2: The USD or the VMC may select items to be vended. The USD may have special requirements for price and/or selection ID display. In this case, the USD may issue a FUNDS request to retrieve this information. The USD must then issue a VEND request to gain approval from the VMC before a vend can take place. (The VMC is responsible for collecting payment and confirming the shipment. At the same time, you can select the goods on the VMC and USD)
        Mode 3: The USD selects items to be vended and has its own pricing information. The USD must issue an vend request to the VMC and gain approval before a vend can take place. (That is, the VMC is only responsible for collecting payments and confirming shipments.)
        Of course, when we are considering designing and using this extended USD interface and designing our application, we must first confirm that the VMC supports the USD interface. Because many vending machines on the market do not support it.
        Waferstar's USD-MDB provides such a converter, which converts the USD interface to the RS232 interface. At the same time, some necessary but tedious tasks were completed. Make the design of USD equipment easier.
    NAMA Releases MDB Version 4.3
        CHICAGO — August 22, 2019 — NAMA announced today the release of the latest version of the Multi-Drop Bus (MDB) standards – Version 4.3.
        This spring, NAMA VDI Task Force Chair Chris Lilly (Compass Group USA) appointed an ad hoc technical standards committee headed by Bob Ross (Ellenby Technologies, Inc.) with special assistance from Scott Hudis (Fawn Engineering Corp.), and Joe Simpkins (USA Technologies, Inc.) to implement revisions to MDB Version 4.2. Fifteen NAMA members volunteered to participate in this latest update, and significant contributions were also provided by the European Vending Association (EVA) with guidance from Vladimir Lopatin (Uvenco Group).
        “As VDI coordinator, I applaud the fine work of this committee under the skillful leadership of Chris Lilly, Bob Ross, and Vladimir Lopatin,” said Michael Kasavana, Ph.D., NAMA Endowed Professor Emeritus. “Committee members provided valuable input that impacts our industry tremendously. MDB Version 4.3 allows for a comprehensive treatment of cashless transactions across convenience services. The MDB standard has a long history of quality and reliability, and MDB Version 4.3 is built on the same proven principles,” he concluded.
        The MDB Version 4.2 standard had not been revised for eight years. MDB Version 4.3 is now available as a downloadable PDF on the NAMA website. Download your copy here. It is important to note that compared to the earlier version, MDB Version 4.3 revisions only appear in ‘Section 7 - Cashless Devices.’ The revised Section 7 is color coded to help clarify the changes. All other sections of MDB Version 4.3 remain identical to those of MDB 4.2.
        Normally customer can order the RS232-MDB box directly from wafer company. For the samples,can order from aliexpress store: https://cnkiosk.aliexpress.com

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    About WAFERSTAR


    Design experts in the field of vending payment products

    WAFER Company is a specialist in vending system design and manufacture the MDB converter for more than 15 years. Since 2003,HUOBEI Powered by waferstar and designed the RS232-MDB adapter box and registered the brand for kiosk vending machine system application. After around 10 years in the field of MDB payment technology, and become the leading designer and manufacture of payment adapter in China. and also exported to many countries. Can provide self-service payment, comprehensive solutions for products in the field of vending machine systems.

    MDB-RS232®,MDB2PC®,RS232-MDB®,PC2MDB® all are our registered brand. With rich experience in electronic product design and continuous design updates and upgrades, our products already have a good market sales and long-term operation guarantee, and have won the trust of customers at China and abroad market.

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