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A serial port interfacing circuit built around AT89C51 microcontroller is presented here for testing and understanding a serial port emulator. It can be used to control a USB port also by using a serial to USB converter. This project can be used to control a device through the serial COM port or USB port of a PC. You can send data to the device from the PC and then receive it back on the PC through the serial port. Here we describe control of eight LEDs from the PC. The LEDs are connected across the output port of the microcontroller. The user interface program is written in Java.