Serial Port Complete: COM Ports, USB Virtual COM Ports, and Ports for Embedded Systems (Complete Guides series)
USB Complete: The Developer's Guide (Complete Guides series)
Modbus: The Everyman's Guide to Modbus
Encyclopedia of Electronic Components Volume 3: Sensors for Location, Presence, Proximity, Orientation, Oscillation, Force, Load, Human Input, Liquid and ... Light, Heat, Sound, and Electricity
USB Embedded Hosts: The Developer's Guide
Practical Electronics for Inventors, Fourth Edition