RFID阅读器SDK包，可以用于开发Impinj阅读器-RFID reader SDK package, can be used in the development of Impinj reader

使用R420读写器开发，编程语言为java语言的windows系统下的开发包，简单的demo适合初学者(Using R420 reader development, programming language for Java language windows system development kit, simple demo suitable for beginners)