The keyboard that most of you have in front is using the IBM standard protocol to communicate with your computer. This protocol has the responsibility to send the key scan codes that you press to the pc and get some response commands from it.
This means that we are dealing with a bi-directional type of protocol as each device (pc/keyboard) sends and receives commands.In this kit, we are using a keyboard to display the message directly on the LCD PS2 communication. In this technology, the keyboard is connected to the microcontroller directly through PS2 port.
So whatever we want to display on the LCD we can just type through keyboard. The kit makes us know the interfacing of PS2 hardware and programming for PS2 communication protocol. The main function is controller via programming that is PS2 protocol, According to the efficient programming done and interfacing if the user types anything on keyboard that will be display on LCD. The controller checks for this protocol efficiency.
BLOCK DIAGRAM OF PS2 INTERFACING OF MICROCONTROLLER