The third part stressed on the design of gantry control print circuit , especially on how to use am85c30 to expand serial port and to realize the master - slave mode multi - point bus serial communication system with the principle gantry control circuit and other subordinate circuits using rs - 485 bus standard . we developed an idea of more tasks and non - occupancy in programming to make sure that the circuit can complete the communication between the gantry control circuit and other circuits within the permissible minimum time in the system 论文的第三部分重点说明了pet系统机电控制部分中主机箱控制板的设计，尤其突出介绍了用串行通信控制器am85c30实现扩展串口，用rs - 485总线传输标准实现的以该控制板为主机，机电控制部分其余子模块为从机的主从式多点总线型串行通信系统，在软件设计上引入了一种多任务非占先式编程的思想，使得该主控制板能够在系统允许的最小时间内完成与其余子模块之间的信息交换。
At present , the design of mechatronics " control system is done by hand and has some problems such as lower intelligence ' s automation , higher demand of designer ' s experience , worst reusability and so on . what is more , the design of software depends on the design of hardware strongly and the programmed languages of different hardware vary . all of these above make for the present situation of higher cost , longer cycle and heavy burden of designers in developing the control system 机电控制系统是机械设备向机电一体化设备转换的重要因素，机电控制系统的设计水平在很大程度上制约着机电一体化技术的发展，目前，机电控制系统的设计基本上采用手工设计的方法，存在着“智能”自动化程度不高、对设计人员的设计经验要求高、控制软件复用性差等问题，尤其是在控制系统中，软件对硬件依赖性极强，往往不同的硬件编程语言差别较大，从而导致了控制系统开发成本高、研制周期长、设计人员负担重的现状。
With the high - speedy development of internet / intranet technology and computer science , the globalization and automation is becoming a necessary trend of mechatronic control industry . using control network make it one of the most important techniques in the area of mechatronic control that based remote mechatronic control system is achieved 随着internet intranet技术和计算机技术的快速发展，机电控制向全球化、自动化的方向发展也成为必然，利用控制网络实现基于internet的远程机电控制，则是机电控制全球化和自动化的一个重要方面。
Ultrasonic motor ’ s vibration is excited by the conversely piezoelectric effect of piezoelectric materials . with the friction coupling , the rotation of the rotor or moving of the slider is generated . as a direct driving motor , it is becoming a hotspot in the field of mechanical and electrical control 超声波电机利用压电陶瓷的逆压电效应产生超声振动,并将这种振动通过摩擦耦合来直接驱动转子或滑块的运动,它作为一种直接驱动电机已成为当前机电控制领域的一个研究热点。
Based on the introduction of the systematic structure and working principle of pet , the thesis mainly described the realization of the partial function in the mechanical and electrical control system . furthermore , the thesis referred the design of a new circuit of fan - out of high frequency clock 本文在介绍正电子发射断层扫描仪系统结构及工作原理的基础上，着重对该仪器机电控制系统的部分功能实现作了详尽描述，并且介绍了一种新型的高频时钟扇出电路的设计。
With the rapid development of computer and network technology , internet is being applied more and more widely into various fields . internet based remote mechatronic control system ( remcs ) will therefore create a new future for traditional mechatrnic control area and will greatly accelerate the development of mechatronic control technology 计算机和网络技术的飞速发展使得互联网得到越来越广泛的应用，由此产生的基于互联网的远程机电控制技术为传统的机电控制领域开辟了新的前景，将会大大推动机电控制技术的发展。
Then , the paper mainly focuses on the data flow in the internet based remcs from the aspects of data acquisition , data exchange and data transmission . data acquisition techniques are investigated and data exchange between monitoring terminals and between monitoring terminals and online control . to the paper then brings forward a communication model of internet based remcs which uses b / s model 接着，论文重点从数据采集、交换与传输三个方面，讨论了基于互联网的远程机电控制系统的数据流问题，研究了数据采集技术以及硬件设施的选取，讨论了数据在现场监控模块内部、现场监控模块与远程监控模块之间的交换方式，提出了采用b s结构的基于互联网的远程机电控制系统数据通信模型。
