... for enhanced security, expandable on request3. Multi-interface: RS232, RS485, USB 2.0, TTL, SPI, Clock & Data / ABA1,2 / ... upgradable10.Firmware customized design to meet various requirement Application1. Embedded device, such as Handheld Terminal, Parking Meters, Vending Machines, ... 2) Power supply (9V) (3) Serial communication cable (4) USB communication cable (5) Wires (6) Testing cards (7) Testing ...