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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
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
Multidrop Microplate Dispensers
Multidrop Microplate Dispensers
Published: 2013/11/18
Channel: Thermo Scientific
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
polin Multi Drop TWINY
polin Multi Drop TWINY
Published: 2012/05/04
Channel: KOREA TOSTEM
MULTIDROP JUNIOR
MULTIDROP JUNIOR
Published: 2012/04/17
Channel: papakyriazis
Polin Multidrop Macaron Production
Polin Multidrop Macaron Production
Published: 2013/07/30
Channel: RVO Enterprises
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
Multidrop Optimization
Multidrop Optimization
Published: 2016/03/02
Channel: IntegrityIntegration
Fernbus Gameplay - Multi Drop
Fernbus Gameplay - Multi Drop
Published: 2016/08/23
Channel: Squirrel
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: MathIndy
Polin multi drop "Welcome"
Polin multi drop "Welcome"
Published: 2012/05/30
Channel: Panamequipment
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT Depositor for Brownies
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT Depositor for Brownies
Published: 2015/03/16
Channel: proBAKE Inc.
RS232 - MDB - CCNET conversion
RS232 - MDB - CCNET conversion
Published: 2016/11/14
Channel: Alex Mina
Multidrop Probe & Sensor Wiring Instructions
Multidrop Probe & Sensor Wiring Instructions
Published: 2013/07/11
Channel: OPW Global
MultiDrop
MultiDrop
Published: 2017/01/05
Channel: CheezMusic
Thermo Multidrop Combi w Rapidstak
Thermo Multidrop Combi w Rapidstak
Published: 2015/05/14
Channel: Oscar Guerra
MDBSlaveReader
MDBSlaveReader
Published: 2015/07/26
Channel: BonusData
Scorpion MultiDrop Combi 2015
Scorpion MultiDrop Combi 2015
Published: 2015/07/03
Channel: John Woodford
Polin multidrop
Polin multidrop
Published: 2011/10/06
Channel: dennis de ruyter
RapidStak microplate stacker with two Multidrop Combi dispensers
RapidStak microplate stacker with two Multidrop Combi dispensers
Published: 2013/03/21
Channel: RapidStak microplate stacker
Multi Drop Orders
Multi Drop Orders
Published: 2016/12/30
Channel: Simple Ton
POLIN MULTIDROP TWINY
POLIN MULTIDROP TWINY
Published: 2016/05/04
Channel: LME Quill
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT Depositor
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT Depositor
Published: 2012/05/29
Channel: proBAKE Inc.
quickdrop/multi drop
quickdrop/multi drop
Published: 2017/07/21
Channel: saransh kumar
SVMBRG - Sahhara feat. VICA [Multidrop Release]
SVMBRG - Sahhara feat. VICA [Multidrop Release]
Published: 2017/03/29
Channel: Multidrop Records
Polin Multidrop depositor from www.brookfood.co.uk  full range in stock, best prices gauranteed
Polin Multidrop depositor from www.brookfood.co.uk full range in stock, best prices gauranteed
Published: 2012/11/29
Channel: BrookFoodEquipment
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.
Polin Multi-Drop Depositor
Polin Multi-Drop Depositor
Published: 2011/03/07
Channel: johnunionphotos
Ode To The Multidrop
Ode To The Multidrop
Published: 2013/02/22
Channel: Richard Cambridge
POLIN MULTIDROP JUNIOR - Cookie Dropper - Subabake
POLIN MULTIDROP JUNIOR - Cookie Dropper - Subabake
Published: 2016/07/11
Channel: SUBA INDIA
CREATE A MULTI DROP DISTRIBUTION
CREATE A MULTI DROP DISTRIBUTION
Published: 2010/11/05
Channel: equatorworldwide
Clash Royale Multidrop Tutorial
Clash Royale Multidrop Tutorial
Published: 2017/07/08
Channel: Randomized YT
Polin Multidrop depositor
Polin Multidrop depositor
Published: 2014/09/11
Channel: UnionMachinery100
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
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
Thermo Scientific 836 MultiDrop Combi Reagent Dispenser 5840300 with Rapidstak - 7440
Thermo Scientific 836 MultiDrop Combi Reagent Dispenser 5840300 with Rapidstak - 7440
Published: 2015/06/05
Channel: WWW.BOSTONIND.COM | Laboratory & Scientific Lab Equipment | Boston Industries, Inc.
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
Multi drop combo demo
Multi drop combo demo
Published: 2015/03/20
Channel: Sirichai Niyamanon
Polin Multidrop MD 393 Tipo "C" II
Polin Multidrop MD 393 Tipo "C" II
Published: 2011/11/10
Channel: docmeat
Multidrop Combi & Multi-reagent Valve stand alone
Multidrop Combi & Multi-reagent Valve stand alone
Published: 2012/04/25
Channel: RapidStak microplate stacker
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT for Whoopie Pies
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT for Whoopie Pies
Published: 2015/03/16
Channel: proBAKE Inc.
Multi drop
Multi drop
Published: 2016/08/29
Channel: Suneet Mehrotra
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT for Biscotti
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT for Biscotti
Published: 2015/03/16
Channel: proBAKE Inc.
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. Drop 4 of 6 (Old #28)
Day long frozen multidrop run. Drop 4 of 6 (Old #28)
Published: 2012/07/08
Channel: DTW-TheWanderingMuzungu
Thermo Scientific MultiDrop Combi
Thermo Scientific MultiDrop Combi
Published: 2014/11/20
Channel: Website: www.bostonlabco.com 617-209-2525 Boston Laboratory Equipment
Scorpion multidrop.wmv
Scorpion multidrop.wmv
Published: 2010/03/25
Channel: John Woodford
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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]

  1. ^ "MDB Specification Version 4.2" (PDF). NAMA. 

External links[edit]

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