It comes with l . smbps and 12mbps ( usb 1 . 1 ) transfer rate and can support a maximum of 127 devices . also , usb devices support pnp ( plug n play ) and hot plug , which makes it easy to use 同时usb总线的应用可以清除pc上过多的i o端口，而以一个串行通道取代，使pc与外设之间的连接更容易。
The results show that enhanced low - dose - rate sensitivity ( eldrs ) exists in both domestic and imported bipolar transistors , and the npn transistors are more obvious than pnp transistors 结果表明：在辐照的剂量率范围内，无论是国产还是进口的双极晶体管，都有明显的低剂量率辐照损伤增强现象，且npn管比pnp管明显。
The switched outputs are designed such that the switching function p - switching or n - switching is determined by the external circuitry . therefore , it is not necessary to keep two versions in stock 设计时，开关输出端被采用了外部电路决定开关功能p型开关pnp或n型开关npn的方式，因此，没有必要准备两种型号的开关。
Delay in three models a pattern of delay or closure of the extension opened pm , the choice ranging from 0 . 1s to 5s dc output transistor sensor has dual npn pnp light diffuse reflectance sensor to regulate and control functions 有三种延时模式一次使用模式，打开延时或关闭延时，选择范围从0 . 1s至5s dc传感器具有双重npn pnp晶体管输出
Usb is a kind of specificat ion of computer connected peripherals . it has the merits of pnp , reiiable data transfer expanding expediently , low cost and so on . in the field of embedded system , it is applied widly Usb是一种计算机外设连接规范，具有即插即用、数据传输可靠、扩展方便、低成本等优点，被广泛地应用于嵌入式系统领域。
The design result indicates that the whole test system works smoothly . benefitted from the usb interface , the tester has the following advanced characteristics : ability for pnp . bus powered characteristics 设计结果表明从边界扫描测试仪硬件、固件、 usb驱动程序，到pc端应用程序的整个边界扫描测试系统工作完好，符合设计目标。
Usb ( universal series bus ) is a new industry standard in pc application , which has the advantages of pnp ( plug and play ) , simple - to - use , easy - to - expand , low - cost and supporting peripherals in a wide range speed Usb总线是pc体系中一套全新的工业标准,具有成本低、使用简单、支持即插即用、易于扩展等特点,并且能够同时支持各种速度的设备。
Microsoft ' s p1ug and play arld the jump1ess software configuration function are both supported . the capabi1ity of the pnp and non - - pnp mode auto - - switch funci t ion a11ow direct ly to 1 inlt common network 在本模块中采用umc公司的um9008作为以太网控制器，使得系统不仅兼容微软公司的即插即用功能，而且与商用以太网完全兼容；具有广泛的通用性。
In addition , some characteristics of vibration signal are told and some functions of the systems are talked about in details because of low cost , simpleness and pnp , universal serial bus has been widely used in pc and embedded system field 串行通用总线( usb )具有低成本、使用简单、支持即插即用、易于扩展等特点，已被广泛地用在pc机及嵌入式系统上。
Based on statistics , the probability distributions of all processes in network planning are suggested and their key parameters are determined . then , the computer simulation algorithm for pnp analysis is put forward in the form of chart 为了加强网络计划技术的实用性及其控制与计划的功能，许多研究者将各种数学方法应用于网络计划之中，模糊方法、灰色理论、集队分析理论等在这些方面都取得了一定的成果。
