Reading Correct Password and Interfacing with AT89S51/2 from the sentence "Masukkan password" with user password is password123, then enter the correct password with viewing LED, still need development but good try for making RS232 communication from AT89S51/2-Reading Correct Password and Interfacing with AT89S51/2 from the sentence "Masukkan password" with user password is password123, then enter the correct password with viewing LED, still need development　but good try for　making RS232 communication from AT89S51/2