Ness wiegand keypad interface wiring

This Presentation gives basic idea as how to interface keypad with microprocessor. The small assembly program is also present in the document.

51X系列银行密码小键盘解决了银行因终端品种繁杂、驱 接口程序不一致而导致的一系列软、硬件不兼容问题 -51X Series banking password keypad solved bank has terminal species complex, flooding Interface program which led to a series of inconsistent software and hardware incompatibilities

4x4 Matrix Keypad Interface with Atmel AVR.