Level converter MAX232 is very essential when we are interfacing the digital hardware (controller) to the computer via serial mode. The computer serial port use RS 232 protocol and controller works on the TTL logic. These two hardware need to synchronize with each other for the proper communications. To solve this problem MAX 232 IC is used, this IC convert RS232 signal to TTL and TTL to RS232. Hence we can exchange few words of our controller with the computer via serial mode and various applications can be designed. Therefore level converter board is designed for the serial communication between controller and computer. This board is used where computer control hardware are designed.