The PC2MDB from Upstate Networks Inc. allows a PC to act as a cashless device and add credit to an exhisting vending machine. The four-position dip switch controls the selection of various configurable options including cashless address, cashless device leve (1 or 2), ASCII or Binary transfer from the MDB to the PC and selftest. System includes MDBlab software and Source Code in visual basic. For more information visit www.upstatenetworks.com or call 800-369-5797.