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 MDB2PC™ Hardware circuit. The MDB2PC™ is a microprocessor controlled hardware interface with embedded firmware that converts the MDB protocol to an RS232 protocol. The USB connection creates a virtual serial port on the pc for communications
more info