Overview

The MDB2USB™ is a Computer Peripheral for interfacing vending machine protocol used by various devices including: Dollar Bill Validators, Coin Acceptors, Coin Dispensers, Smart Cards, Foreign Currency, etc. This describes the Interface Protocol for the MDB2USB Hardware circuit. The MDB2USB™ interfaces any MDB vending device (6-pin molex/5pin MTA) to the PC via the USB port, creating a virtual comm port.

Quick Start

Install the MDB2usb™ on a free USB port. Then look in Device Manager under Comm Ports.

Connect 24Vdc power and MDB connections (6-pin Molex).  Apply power.  Check for LED1 (Green) indicating power is OK.

Install and run MDBLAB application.

Hardware Installation
Table 1 - Jumper functions

Table 2 - LED Functions

Figure-2 Connector Pin Outs

Install the MDB2USB™

It is time to install the MDB2USB™ itself and move on to the testing phase.  Installation is relatively simple; there are only two connections that must be made for full functioning of the device.  There are connectors on the edge of the board.  The 6-pin Molex connects to the MDB devices. The final connector is a USB type A and connects into the back of the computer.  There should be an open port on the back of the computer labeled “USB”

 MDB OPERATION NOTES

BILL VALIDATOR

Bills Accepted  (Byte 1)

1yyyxxxx          yyy = Bill Routing

                                   000 = Bill Stacked

                                   001 = Escrow Request

                                   010 = Bill Returned

                                   011 = Not Used

                                   100 = Disabled Bill Rejected

                       xxxx =  Bill Type

 The bill types are:

            Type 0 = $1                 Type 2 = $5                 Type 4 = $20

            Type 1 = $2                 Type 3 = $10

 The bill type number is also the same as the bit # that must be set in order to enable the acceptance of the bill itself. Ex. Set bit 3 to enable acceptance of a $10.

    When  all of the DIP switches, on the BV, are set to NOT accept any type of bill, the validator’s default is to accept one dollar bills.

    The software should have all of the bill types enabled, this will allow the user to set which type of bills to be accepted on the validator itself.

Bill Validator Operation Notes

-Firmware sets Bill Validator to accept 1, 2, 5, 10, 20 US bills by default

-Any commands to changed bills accepted or held in escrow will be set back to the firmware defaults upon a cycling of power or reset.

VMC Commands for Bill Validator

US Bills – Bit 0 = $1  Bit 3 = $5   Bit 5 = $20

                 Bit 1 = $2    Bit 4 = $10

BILL’S ACCEPTED

Bill Type        34h     4bytes  Y1-Y4

Bill’s Accepted

Y1-Y2 = 001Fh   for all US bills accepted

             = 0000h   accept no bill’s

Bill’s held in Escrow

Y3-Y4 = 001Fh   for all US bills held in escrow

            = 0000h    for no bill’s held in escrow  

 Send out 34h and then the 4 bytes Y1-Y4 to change bill’s accepted and held in escrow.

BILL’S IN ESCROW ACTION

Escrow           35h        1byte    Y1

 Return bill  Y1 = 00h

Stack bill    Y1 = 01h

 Send  35h and then Y1 to act on bill held in escrow

STACKER STATUS

Stacker                        36h      response  Z1-Z2

 Byte1                           Byte2

Fxxxxxxx                      xxxxxxxx

 F=1 Stacker Full

Xxxxxxxxxxxxxxx = Number of bill’s in stacker

 Send out a 36h to the Bill Validator—It will respond with 2 bytes Z1-Z2

COIN  ACCEPTOR

Coins Deposited:   (Byte 1)                                                             (Byte 2)

01yyxxxx          yy = Coin  Routing                                      zzzzzzzz = The number of coins

                                00: Cash Box                                                       in the tube for the

                                01: Tubes                                                             type accepted.

                                10: Not Used

                                11: Reject

                    xxxx = Coin  Type

Coins Dispensed Manually                                                            (Byte 2)

1yyyxxxx     yyy = The number of coins dispensed    zzzzzzzz = Same as above.

                    xxxx = The coin type dispensed

The coin types are:

            Type 0 = 5c                 Type 2 = 25c               Type 5 = $2 Can.

            Type 1= 10c                Type 4 = $1 Can.

Note: The type of the coin is the same as the bit that needs to be set in the ‘mdbCointype’ routine in order                                                                                                                                    to enable the acceptance, or distribution of that coin.