PC Controlled vending since 1994

Upstate Networks Incorporated
MDB, USB, RS-232, Bill, Coin, & Magnetic swipe hardware  for PC vending machine controllers
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The following source code was written specifically for USI's Universal Satellite Device using the PC2MDB:

PC2MDB USI USD Version 1.0 VB installable and source code download (3.3M Zip file)

*[1]. National Automatic Merchandising Association, March 26, 2003. Multi_Drop Bus/Internal Communication Protocol: Section 7 "Cashless Device(s) VMC/Peripheral Communication Specifications": 7.1-7.53.