The free source code of serial port control allows using a web page to send and receive hexdecimal bytes or ASCII characters. It is developed for the Embedded Internet Applications (EIA) and running on any AWC86/86A based system with MicroRTOS operating system. MicroRTOS is an Internet enabled real-time operating system developed by Advanced Web Communication division of Xecom, Inc. The source program can be modified and compiled using Microsoft and Borland C++ tools.