This paper briefly analyzes the present situation of textile mill＇s air-conditioning system. Since it is difficult to establish detailed math model to control a textile mill＇s airconditioning system because of the i...This paper briefly analyzes the present situation of textile mill＇s air-conditioning system. Since it is difficult to establish detailed math model to control a textile mill＇s airconditioning system because of the influence of various factors such as the differences in seasons, regions, etc., most air-conditioning equipment can not be controlled automatically. This paper suggests utilizing multi-function data acquisRion card to collect the data about the temperature and humidity of a workshop, processing the data on a PC, comparing them with the expert database, and then using the 485 serial port expanding module to output the parameters, which are used to control the inverter, so that the purpose of adjusting the temperature and humidity of the workshop is achieved.展开更多
文摘针对传统应用飞机内部时分指令/响应型多路串行数据总线(MIL-STD-1553B:Military Standard 1553 Bus)需要大量外围芯片的问题,在研究MIL-STD-1553总线协议的基础上,实现一种以现场可编程逻辑器件(FPGA:Field Programmable Gate Array)为核心的1553B接口模块。综合分析了FPGA控制1553B总线的原理和过程,给出了FPGA控制通用串行总线(USB:Universal Serial Bus)的实现方法。采用变压器耦合的方式,通过HI-1567转换器,将信号送入FPGA中,利用FPGA内部丰富的逻辑资源完成对总线数据的采集、编解码以及与PC(Personal Computer)机的通信,并将FPGA接收到的数据信息显示在PC机上。实验结果表明,该设计方案完成了总线数据的发送和接收,实现了总线数据的正确传输,不但减少了大量的外围电路,而且提高了系统的可靠性和实时性。
文摘This paper briefly analyzes the present situation of textile mill＇s air-conditioning system. Since it is difficult to establish detailed math model to control a textile mill＇s airconditioning system because of the influence of various factors such as the differences in seasons, regions, etc., most air-conditioning equipment can not be controlled automatically. This paper suggests utilizing multi-function data acquisRion card to collect the data about the temperature and humidity of a workshop, processing the data on a PC, comparing them with the expert database, and then using the 485 serial port expanding module to output the parameters, which are used to control the inverter, so that the purpose of adjusting the temperature and humidity of the workshop is achieved.
