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I assembled this guide from various posts and links from 8052.com It is meant to serve as a simple guide to getting a working RS232 communications connection between a personal computer (PC) and a micro controller based device. Despite the wealth of information available on the web and 8052.com, there are still many, many very basic questions posted every week. This was designed to give everything all in one place, so that there doesn’t have to be a here and there search for all the relevant information. Several members on the 8052.com forum contributed to the information contained herein.
IanP said:All information you may need to connect 8051-family microcontroller to a PC via the RS-232 port can be found in:
"A Simple RS232 Guide"