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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 And Lost  - Class2 HGV #12
Multidrop And Lost - Class2 HGV #12
Published: 2017/08/27
Channel: Scott Andrews
telford 7.5 multidrop
telford 7.5 multidrop
Published: 2018/01/09
Channel: leon27581
Polin Multidrop Depositor in use at Brook Food Test Bakery
Polin Multidrop Depositor in use at Brook Food Test Bakery
Published: 2017/12/05
Channel: BrookFoodEquipment
IMG 3501
IMG 3501
Published: 2017/02/15
Channel: Oscar Guerra
multi drop vol 2
multi drop vol 2
Published: 2017/08/17
Channel: Oliver Hall
MultiDrop
MultiDrop
Published: 2017/01/05
Channel: CheezMusic
Polin Multi-Drop Roller Removal | Food Makers Bakery Equip
Polin Multi-Drop Roller Removal | Food Makers Bakery Equip
Published: 2016/03/01
Channel: Food Makers Bakery Equipment
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT Depositor
ProBAKE Bakery Equipment - POLIN MULTIDROP COMPACT Depositor
Published: 2012/05/29
Channel: proBAKE Inc.
Fernbus Gameplay - Multi Drop
Fernbus Gameplay - Multi Drop
Published: 2016/08/23
Channel: Squirrel
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
BID ON EQUIPMENT: Item 315863 - POLIN Multidrop Cookie Depositor
BID ON EQUIPMENT: Item 315863 - POLIN Multidrop Cookie Depositor
Published: 2017/10/31
Channel: Tech BidonEquipment
Scania P250 Interior (2016)
Scania P250 Interior (2016)
Published: 2016/08/09
Channel: TheRockgod23
Multi Drop Orders
Multi Drop Orders
Published: 2016/12/30
Channel: Simple Ton
Plan delivery route for multiple drivers
Plan delivery route for multiple drivers
Published: 2016/03/02
Channel: RouteXL
Multi-Drop In Southern Alabama With Maverick Transportation Part IIa Craig Ryan 6-15-17
Multi-Drop In Southern Alabama With Maverick Transportation Part IIa Craig Ryan 6-15-17
Published: 2017/06/19
Channel: Craig Ryan
Multi Drop Fail 😣
Multi Drop Fail 😣
Published: 2016/06/11
Channel: CricketNiveja
multi drop
multi drop
Published: 2017/08/17
Channel: Oliver Hall
quickdrop/multi drop
quickdrop/multi drop
Published: 2017/07/21
Channel: clash with sk
Multi-drop with a Hanging Rock
Multi-drop with a Hanging Rock
Published: 2016/10/10
Channel: Scott Tyler
SMORGZ - Vision [ Multidrop Release]
SMORGZ - Vision [ Multidrop Release]
Published: 2017/10/25
Channel: Multidrop Records
Cat’odic - Deadly Race [Multidrop Release]
Cat’odic - Deadly Race [Multidrop Release]
Published: 2017/10/31
Channel: Multidrop Records
Loyaltek cashless on Sodexo vending machine
Loyaltek cashless on Sodexo vending machine
Published: 2014/03/19
Channel: Loyaltek
Nikku
Nikku's Minecraft MultiDrop Mod v0.2
Published: 2011/10/03
Channel: Stratos Gaming
Automated assay preparation on the Transcriptic Robotic Cloud Lab
Automated assay preparation on the Transcriptic Robotic Cloud Lab
Published: 2017/04/24
Channel: Transcriptic
Change machine controller - MDB bill validator and ccTalk hopper
Change machine controller - MDB bill validator and ccTalk hopper
Published: 2014/10/17
Channel: Mihai Rainer
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
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
KM006 (KMV-G654) - Large Combo Snack&Drink Vending Machine
KM006 (KMV-G654) - Large Combo Snack&Drink Vending Machine
Published: 2016/08/22
Channel: PANDA VENDING LIMITED
multi drop
multi drop
Published: 2015/07/02
Channel: JiayoJames
Molex Multi-Drop Sealed Connector System
Molex Multi-Drop Sealed Connector System
Published: 2011/02/28
Channel: Molex Electronic Solutions
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 route on TomTom GO 5000
Multi drop route on TomTom GO 5000
Published: 2015/12/15
Channel: RouteXL
SVMBRG - Sahhara feat. VICA [Multidrop Release]
SVMBRG - Sahhara feat. VICA [Multidrop Release]
Published: 2017/03/29
Channel: Multidrop Records
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
Speed and Versatility
Speed and Versatility
Published: 2016/12/21
Channel: Thermo Fisher Scientific
FERNBUS SIMULATOR | RYCHLÁ JÍZDA - BUS | by PeŤan | #01
FERNBUS SIMULATOR | RYCHLÁ JÍZDA - BUS | by PeŤan | #01
Published: 2018/01/04
Channel: petangames
Multi-reagent dispensing
Multi-reagent dispensing
Published: 2012/03/01
Channel: RapidStak microplate stacker
JOB ALERT! Multidrop 7.5 Tonne Driver
JOB ALERT! Multidrop 7.5 Tonne Driver
Published: 2017/06/04
Channel: FlexiStaff Solutions LTD
MY FIRST
MY FIRST 'MULTI DROP ROUTE' (Fernbus Coach Simulator) #3
Published: 2016/09/09
Channel: JH Gaming
Chan Chasm 1 of 4
Chan Chasm 1 of 4
Published: 2008/01/30
Channel: Dirk Siron
EzLink Vending Machine
EzLink Vending Machine
Published: 2010/03/29
Channel: Ho Yeong Cherng
Serial Data Analyzer for Vending Machine Protocols
Serial Data Analyzer for Vending Machine Protocols
Published: 2013/06/11
Channel: Anton Kappeler
SMiTHMUSiX - Dab This
SMiTHMUSiX - Dab This
Published: 2017/10/05
Channel: Multidrop Records
routeMASTER Planner
routeMASTER Planner
Published: 2015/04/07
Channel: AGMTelematics
535  Multidrop comunication HVAC Consultant 9825024651
535 Multidrop comunication HVAC Consultant 9825024651
Published: 2015/08/08
Channel: STANTEC HVAC CONSU LTANT
Bus Driver Simulator 2018 - First Look
Bus Driver Simulator 2018 - First Look
Published: 2018/02/09
Channel: Squirrel
Overspeed - Class1 HGV #8
Overspeed - Class1 HGV #8
Published: 2017/06/25
Channel: Scott Andrews
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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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