一篇讨论红外解码的文档，特别是说明了空调控制码的实现方式与解码机制，比如upd6121.-An article in describing the decoding method of infrared control codes. The most interesting part is about to fully describe the implementation method of HVAC control codes such as upd6121

BACnet是用于智能建筑的通信协议. BACnet针对智能建筑及控制系统的应用所设计的通信，可用在暖通空调系统（HVAC，包括暖气、通风、空气调节）也可以用在照明控制、门禁系统、火警侦测系统及其相关的设备(BACnet is a communication protocol for intelligent buildings Application of BACnet communication and control system for intelligent building des