... integrating into existing devices 2. Multi-interface: RS232, RS485, USB, TTL, SPI, C&D, ABA1/2, Wiegand CN3XX(S)(T)-X ... , expandable on request3. Multi-interface: RS232, RS485, USB 2.0, TTL, SPI, Clock & Data / ABA1,2 / Wiegand26-584. Compliant with CCID ... and cost for development- Examples for good reference and understanding, using developing tools like Delphi, C++ Builder, C#, .NET, VC, VB ...