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Coinco Multi-Drop Bus (MDB) Virtual Test Box VMTB-400
Coinco Multi-Drop Bus (MDB) Virtual Test Box VMTB-400
Published: 2010/04/20
Channel: CoincoWeb
Multi Drop Orders
Multi Drop Orders
Published: 2016/12/30
Channel: Simple Ton
MDB Converter (MDB to Serial Converter)
MDB Converter (MDB to Serial Converter)
Published: 2015/09/03
Channel: Abrantix AG
Multidrop microplate dispensers
Multidrop microplate dispensers
Published: 2016/12/21
Channel: Thermo Fisher Scientific
Fernbus Gameplay - Multi Drop
Fernbus Gameplay - Multi Drop
Published: 2016/08/23
Channel: Squirrel
ProBAKE Bakery Equipment - POLIN MULTIDROP CLASSIC Cookie Depositor (Part 3)
ProBAKE Bakery Equipment - POLIN MULTIDROP CLASSIC Cookie Depositor (Part 3)
Published: 2012/05/31
Channel: proBAKE Inc.
MDBSlaveReader
MDBSlaveReader
Published: 2015/07/26
Channel: BonusData
Fernbus Simulator - Multi Drop | Koln to Essen | Part 1
Fernbus Simulator - Multi Drop | Koln to Essen | Part 1
Published: 2016/09/16
Channel: Taff in Exile
Multi Drop Fail šŸ˜£
Multi Drop Fail šŸ˜£
Published: 2016/06/11
Channel: CricketNiveja
MULTIDROP JUNIOR
MULTIDROP JUNIOR
Published: 2012/04/17
Channel: papakyriazis
Polin Multidrop Classic - a depositor, dosing machine & a wire cut machine
Polin Multidrop Classic - a depositor, dosing machine & a wire cut machine
Published: 2013/02/18
Channel: RVO Enterprises
SVMBRG - Sahhara feat. VICA [Multidrop Release]
SVMBRG - Sahhara feat. VICA [Multidrop Release]
Published: 2017/03/29
Channel: Multidrop Records
Multidrop Probe & Sensor Wiring Instructions
Multidrop Probe & Sensor Wiring Instructions
Published: 2013/07/11
Channel: OPW Global
Multidrop Combi & Multi-reagent Valve stand alone
Multidrop Combi & Multi-reagent Valve stand alone
Published: 2012/04/25
Channel: RapidStak microplate stacker
MultiDrop
MultiDrop
Published: 2017/01/05
Channel: CheezMusic
Ode To The Multidrop
Ode To The Multidrop
Published: 2013/02/22
Channel: Richard Cambridge
Multidrop exhibition live demo
Multidrop exhibition live demo
Published: 2016/02/26
Channel: F&B Equipment Sdn Bhd
Multidrop applications example for Mathews Engineering FETAMP1
Multidrop applications example for Mathews Engineering FETAMP1
Published: 2011/03/27
Channel: Tom Mathews
Thermo Multidrop Combi w Rapidstak
Thermo Multidrop Combi w Rapidstak
Published: 2015/05/14
Channel: Oscar Guerra
Polin Multidrop depositor
Polin Multidrop depositor
Published: 2014/09/11
Channel: UnionMachinery100
Polin Multidrop Macaron Production
Polin Multidrop Macaron Production
Published: 2013/07/30
Channel: RVO Enterprises
Day long frozen multidrop run. Drop 3 of 6 (Old #27)
Day long frozen multidrop run. Drop 3 of 6 (Old #27)
Published: 2012/07/08
Channel: DTW-TheWanderingMuzungu
RapidStak microplate stacker with two Multidrop Combi dispensers
RapidStak microplate stacker with two Multidrop Combi dispensers
Published: 2013/03/21
Channel: RapidStak microplate stacker
trucker mark #29 multi dropping
trucker mark #29 multi dropping
Published: 2015/07/30
Channel: mark hickey
Scorpion multidrop.wmv
Scorpion multidrop.wmv
Published: 2010/03/25
Channel: John Woodford
Polin multidrop
Polin multidrop
Published: 2011/10/06
Channel: dennis de ruyter
Fernbus Simulator - Multi Drop | Koln to Essen | Part 2
Fernbus Simulator - Multi Drop | Koln to Essen | Part 2
Published: 2016/09/21
Channel: Taff in Exile
polin Multi Drop TWINY
polin Multi Drop TWINY
Published: 2012/05/04
Channel: KOREA TOSTEM
POLIN MULTIDROP JUNIOR - Cookie Dropper - Subabake
POLIN MULTIDROP JUNIOR - Cookie Dropper - Subabake
Published: 2016/07/11
Channel: SUBA INDIA
Super serial bus smart robot servo 70pcs Multiple Servo Control with Arduino for Arduino DIY
Super serial bus smart robot servo 70pcs Multiple Servo Control with Arduino for Arduino DIY
Published: 2017/04/06
Channel: Four Lai
MULTI DROP USE TEST
MULTI DROP USE TEST
Published: 2016/03/22
Channel: VOTO GLOBAL
quickdrop/multi drop
quickdrop/multi drop
Published: 2017/07/21
Channel: saransh kumar
WS2812b Led pixel wall with bespoke 18F26K22 processor and pc interface
WS2812b Led pixel wall with bespoke 18F26K22 processor and pc interface
Published: 2014/06/11
Channel: Andy Fordham
Day long frozen multidrop run. Drops 5&6 of 6 (Old #29)
Day long frozen multidrop run. Drops 5&6 of 6 (Old #29)
Published: 2012/07/08
Channel: DTW-TheWanderingMuzungu
Day long frozen multidrop run. Drops 1&2 of 6 (Old #26)
Day long frozen multidrop run. Drops 1&2 of 6 (Old #26)
Published: 2012/07/08
Channel: DTW-TheWanderingMuzungu
Polin Multi-Drop Depositor
Polin Multi-Drop Depositor
Published: 2011/03/07
Channel: johnunionphotos
Scorpion MultiDrop Combi 2015
Scorpion MultiDrop Combi 2015
Published: 2015/07/03
Channel: John Woodford
multi drop vol 2
multi drop vol 2
Published: 2017/08/17
Channel: Oliver Hall
AX T1 payment terminal for the vending machine industry
AX T1 payment terminal for the vending machine industry
Published: 2015/09/04
Channel: Abrantix AG
MDB protocol recording for vending machines and payment systems
MDB protocol recording for vending machines and payment systems
Published: 2013/06/11
Channel: Anton Kappeler
Multi drop
Multi drop
Published: 2016/08/29
Channel: Suneet Mehrotra
Thermo Scientific MultiDrop Combi
Thermo Scientific MultiDrop Combi
Published: 2014/11/20
Channel: Website: www.bostonlabco.com 617-209-2525 Boston Laboratory Equipment
Feetech Smart Robot Servo/Daisy Chain Servo System For Fobotics
Feetech Smart Robot Servo/Daisy Chain Servo System For Fobotics
Published: 2016/11/15
Channel: Rc Fitec
Feetech SCS009  SERVO Multi-purpose UART Bus Robot Servo for Arduino DIY
Feetech SCS009 SERVO Multi-purpose UART Bus Robot Servo for Arduino DIY
Published: 2017/03/29
Channel: FEETECH Jenny Deng
modus. - Parhelion [Multidrop Release]
modus. - Parhelion [Multidrop Release]
Published: 2017/09/11
Channel: Multidrop Records
Thermo Scientific MultiDrop Combi
Thermo Scientific MultiDrop Combi
Published: 2014/11/20
Channel: Website: www.bostonlabco.com 617-209-2525 Boston Laboratory Equipment
Multiple Multi
Multiple Multi's Drop Zone
Published: 2012/06/18
Channel: HoVa Assassin
Polin Multidrop Twiny
Polin Multidrop Twiny
Published: 2013/07/29
Channel: RVO Enterprises
RapidStak microplate stacker and Multidrop Combi
RapidStak microplate stacker and Multidrop Combi
Published: 2014/03/06
Channel: RapidStak microplate stacker
Day long frozen multidrop run. Drop 4 of 6 (Old #28)
Day long frozen multidrop run. Drop 4 of 6 (Old #28)
Published: 2012/07/08
Channel: DTW-TheWanderingMuzungu
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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A multidrop bus (MDB) is a computer bus in which all components are connected to the electrical circuit. A process of arbitration determines which device sends information at any point. The other devices listen for the data they are intended to receive.

Multidrop buses have the advantage of simplicity and extensibility. However, modern SDRAM chips exemplify the problem of electrical impedance discontinuity.[clarification needed] Fully Buffered DIMM is an alternative approach to connecting multiple DRAM modules to a memory controller. Since 2000, multidrop standards such as PCI and Parallel ATA are increasingly being replaced by point-to-point systems such as PCI Express and SATA.

MDB in vending machines[edit]

The multidrop bus used by vending machine controllers to communicate with the vending machine's components, such as a currency detector, is also called MDB (for MultiDropBus). In use since the 1980s, it is now an open standard of the National Automatic Merchandising Association, or NAMA. The devices communicate in a single-master, multiple-slave configuration using the MDB protocol, which is based on a Motorola[specify] 9-bit UART implemented as an 8-bit data value with an additional mode bit. The mode bit differentiates between ADDRESS and DATA bytes. The master sends messages containing one address byte and a variable number of data bytes. The bus "slave devices" listen for an address, and if it matches their address that slave device will process the message and respond to the master.[1] Though 9-bit compliant UARTs are not popular in PCs, they can be found in many microcontrollers.

The physical connection is realized as a serial bus with a fixed data rate of 9600 baud. There are just 2 communications signals plus the essential common-ground reference signal. The TX signal goes from the MASTER to every SLAVE device. The RX signal goes from every SLAVE device to the MASTER device. Both signals have pull-ups. The bus is driven at every transmitter by an open collector transistor driver, and isolated at each receiver with an opto-isolator - though cable harnesses carrying the communication signals may also carry 24-volt power and ground signals to devices, meaning the devices may not be isolated from each other as they share the same power bus. Some devices, however, may have alternate power supplies, especially devices with motors and high current needs such as vintage bill acceptors or currency detector devices.

MDB originated as a proprietary bus used by CoinCo for their coin-acceptors in the late 1980s and was deployed in high volume in vending machines for Coca-Cola. Coke forced CoinCo to "open-source it" in 1992 to increase competition, and NAMA released the first version of the standard in 1995, allowing other vendors to compete for the coin-acceptor portion of the vending machines (CoinCo and Mars were the 2 major suppliers in North America at the time) and also enabled alternative payment schemes (e.g. Smartcard based) to be connected to existing vending machines.

Bus addressing is based on the device type only, which allows for a very simple protocol stack, as no initial enumeration needs to be performed.

ccTalk[edit]

The ccTalk multidrop bus protocol uses an 8 bit TTL-level asynchronous serial protocol. It uses address randomization to allow multiple similar devices on the bus (after randomisation the devices can be distinguished by their serial number). ccTalk was developed by CoinControls, but is used by multiple vendors.

See also[edit]

References[edit]

External links[edit]

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