... SAM socket for enhanced security, expandable on request3. Multi-interface: RS232, RS485, USB 2.0, TTL, SPI, Clock & Data / ... upgradable10.Firmware customized design to meet various requirement Application1. Embedded device, such as Handheld Terminal, Parking Meters, Vending Machines, ... list:(1) Testing board (2) Power supply (9V) (3) Serial communication cable (4) USB communication cable (5) Wires (6) ...