Visual Basic Programmer's Guide to Serial Communications
Add serial communications to your Visual Basic applications using Custom Controls and the Windows API.  Includes VB5!  Here is the information you that you need to use modems and direct serial connections (including RS-232, RS-422 and RS-485) for almost any purpose.  Richard Grier uses his many years of experience to guide you through the process, while providing the insight that you will need to extend and adapt the ideas that he presents to your own projects. Make your serial communications programs reliable.  Learn how to debug communications problems.  Resources galore!  Bonus Disk Included! --Book Description