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6. Modes of Operation
MDB mode
6.1.1 Description
The majority of the Vending Machines support the MDB or Executive communication protocol.
MultiDrop Bus (MDB)
“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. In use since the 1980s, it
is now an open standard of the National Automatic Merchandising Association, or NAMA.”
In general:
The Payter Vending terminals will support all Vending Machines that comply with the MDB
specifications. Level 1-3.
This mode of operation is commonly used for vending machines.
The vending machine controller(VMC) and the terminal are physically connected using a single
cable for power and communication. The VMC is the BUS master and instructs the terminal when
to initiate a transaction.
All electrical and datalink aspects are covered by the MDB standard, this simplifies the
integration of the terminal to a plug and play experience. With only a few settings that require
attention. The terminal is classified as an MDB Cashless Device, and supports Level 3
functionality including “always idle mode” from the MDB specification v4.2.
For a detailed description on the MDB interface, consult the MDB v4.2 specification
documentation.
6.1.2 Connecting the terminal
Note: Always Turn off the vending machine when installing a new MDB device!
Connect the P6X terminal to the VMC using the supplied MDB Cable. Power up the vending
machine, the terminal should power up as well. After boot-up has completed the terminal should
automatically register with the VMC.
Fig. 7 – P6X Terminal VMC connection.
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