Serial port programming VB6 via Win32 API

I am interacting with a bill acceptor connected via serial in VB6 using the MSComm control. We're having some communication issues, and I have been tasked with using the Win32 API directly to interact with the se开发者_如何学JAVArial port. I'm not quite sure where to begin. Any links, articles, or books would be greatly appreciated.

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Serial Port Communication: perform serial port I/O without using the Microsoft Comm Control component

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Richard Grier

• Book Visual Basic Programmer's guide to serial communications available from Amazon or direct from author
• Sometimes still active on the VB6 newsgroups - try asking there