There is a very definitive book on RS232 that contains a wealth of information. It is especially valuable to a Visual Basic programmer, particulary if you like to prototype in Visual Basic on your PC before moving the work over to your 8051/52 embedded platform.

The book is called Visual Basic: Programmers Guide to Serial Communications. The author is Richard Grier. ISBN 1-890422-25-8. You can look at and order it @ www.mabry.com.

Michael Karas