RFID读写器的PS/2接口设计

Design of RFID Reader's PS/2 Interface

随着物联网的兴起,RFID技术受到了前所未有的重视。而现在应用于各个频段的RFID读写器,一般都需要与PC机连接才能工作。为了实现控制的目的,必须在计算机上为其安装不同的上位机驱动程序。不能即插即用很大程度上限制了RFID读写器的应用。基于上述考虑,该文利用操作系统内一般都集成有PS/2协议驱动,开发设计了基于PS/2的RFID读写器无驱动模块,实现了读写器即插即用的功能。并且考虑到目前很多计算机都不支持PS/2接口,利用OKE122-U转换芯片将实现的PS/2接口转换为USB接口。该文首先对PS/2接口作了简要介绍,对PS/2协议时序做了详细说明,并给出了硬件连接电路和软件设计过程,最后提供了读写器与主机通信时利用示波器抓取到的信号。

With the development of the Internet of Things,much attention has been attached to RFID technology.Most of the RFID readers applied in the present market in each frequency band can work only when they are connected to PC.In order to controle the reader,we must install drivers on PC.The application of RFID readers have been restricted because they can not plug and play.To solve this problem,this paper designs the module,which takes advantage of the operation system＇s embedded PS/2 protocol and doesn＇t need to install driver,finally complement the function of ptuging and playing. And considering many PC nowadays don＇t have PS/2 connector,we use the OKE122-U integreted cir cuit to achieve the transform from PS/2 connector to USB connector.The paper first introduces the PS/2 interface simply,and gives detailed describtion of PS/2 protocol timing.Then it provides the schematic of the module and software development process.At last it shows the waveforms captured in the oscillo scop when the reader is communicating with PC.