A method and system for communicating data between a network operations center and a remote device is described. Vending machine state information is communicated between a vending site and a network operations center using a delta scheme. A database, maintained by the network operations center, maintains...http://www.google.de/patents/US20010042121?utm_source=gb-gplus-sharePatent US20010042121 - Method and system for the optimal formating, reduction and compression of DEX/UCS data
