POS for .NET is the .NET programming solution of the UnifiedPOS (UPOS) standard. POS for .NET allows POS developers to write one application that support POS devices from different equipment manufacturers. Professional’s Guide to POS for .NET provides a foundation for those interested in learning the basics of POS for .NET applications and service objects. The book has 6 chapters cover POS for .NET architecture, POS for .NET application development, creating service objects, and managing service objects. There are over 14 exercises and examples written in VB.NET and C#.
I was extending an existing POS for .NET project, and needed a weigh scale service object for testing purposes, but I didn't have a firm grasp on how all of this works. I tried reading the Microsoft stuff, but it didn't help clarify anything. Then I found this book, and an hour later I had a working weigh scale simulator!
I read the first few chapters for orientation, and then read the part about how to create a weigh scale service object - complete with working source code in C#.
This book paid for itself very quickly, and now it'll sit in my kindle library as a reference book. I highly recommend this for anyone doing POS for .NET development.