MDB-RS232 ( MDB2PC ) and MDB2Pi Converter box, good adapter for vending machine design. That is used to connect the MDB coin validator, bill acceptor and cashless payment device to computer or PLC, Raspberry pi or android board,mdb router. and the new designed version also can support the USD and AGE Verification interface. Waferstar also suppy the mdb-spy mdb sniffer box and the letpos and VMC simulator board for vending machine protocol development.