Serial Port Complete: COM Ports, USB Virtual COM Ports, and Ports for Embedded Systems (Complete Guides series)
"If you've ever looked for serial port examples online, you've probably become very frustrated. . . . The examples here won't frustrate you."  —About.com: Visual Basic"Whether your interest is hardware or software and whether you work with PCs, embedded systems, or both, you’ll find useful guidance in this book."  —EDN“About as complete a reference as you’ll find on serial communications.”  —Embedded Systems Programmingon the first edition“A very practical book.”  —Nuts & Voltson the first edition"If you plan to use a serial port in any sort of application, buy this book." —Test & Measurement Worldon the first edition"It's not just the how, it's the why that's explained. The emphasis of the book is on doing something useful."  —TechBookReport.com"As complete a reference as you'll find on serial communications using RS-232 and RS-485." —The Embedded Muse