本科毕业设计英文翻译 专业名称 电子信息工程 学生姓名 * 指导教师 * 完成时间 2013.06 本科毕业设计英文翻译 指导教师评阅意见 学生姓名：* 班级：122902 得分： 请指导教师用红笔在译文中直接进行批改，并就以下几方面填写评阅意见，给出综合得分（满分按15分计）。1、专业术语、词汇翻译的准确性；2、翻译材料是否与原文的内容一致；3、翻译材料字数是否符合要求；4、语句是否通顺，是否符合中文表达习惯。 指导教师（签名）： 年 月 日 Serial Communication Based Character Display Terminal To introduceWith microcontroller and microprocessor technology continues to evolve, especially in the field of network technology widely used in the monitoring and control by the PC and multi-single chip consisting of multi-machine network monitoring and control system has become the SCM technology development in one direction. Computer and computer or computer data transfer between the terminal can use a serial communications and parallel communications in two ways. Since the serial communication line with the use of small, low cost, especially in the long-distance transmission, the number of lines characteristic avoids inconsistencies which are widely used. In serial communications, require communicating parties have adopted a standard interface that allows different devices can be easily connected together for communication. RS-232-C interfaces (also known as EIA RS-232-C) is the most commonly used as a serial communication interface. It was in 1970 by the American Electronics Industry Association (EIA) joint Bell System, modem manufacturers and computer terminal manufacturers jointly developed a standard for serial communications. Its full name is data terminal equipment (DTE) and data communications equipment (DCE) serial binary data exchange interface between technical standards, This standard requires the use of a 25 foot DB25 connector, the connector of each primer pin signal content to be provided, but also on the level of a variety of signals to be provided. A combination of single-chip serial communication in real-time data acquisition and computer graphics processing, display advantages. Meanwhile, windows environment background in database management computer has obvious advantages. Makes the application of SCM is not limited to traditional automatic monitoring or control, and the formation of the core of the network-distributed multi-point system trends. This paper describes the PC-51 series MCU communication with the general method and a brief extension.Microcontroller hardware structure and communication system Microcontroller and PC serial communication generally use RS-232, RS-422, or B3-485 bus standard interface, there is also a non-standard 20nnJL current loop. To ensure reliable communications, the choice of interface must be noted: (1) the rate of communication; (2) Communication distance: (3) anti-jamming capability; (4) networking. This paper describes the use of RS-232 interface to communicate with the microcontroller method.1, RS-232 level converter and PC interface circuitRS-232 is an early data communication to the public telephone network and established standards, the logic level and ITL CMOS power almost entirely different. Logic 0 is defined as +5- +15 V between logic 1, defined as between -5 -15V Since RS-232 transmit and receive between common ground transmission using non-equilibrium model, so a total of mode noise is coupled to the signal system, the standard recommended maximum communication distance of 15 meters, but the practical application of our 300bi :/ s rate can reach 300 meters.RS-232 level and the general provisions of the microprocessor logic level inconsistent, must be level conversion, logic-level translators can use the following three ways.The conversion interface using MAX232 MAX232 chip is produced by MAXIM, including two-way driver and receiver RS-232 converter chip. Figure 2 is a practical circuit. Chip has an internal voltage converter, you can convert the input voltage is +5 v RS-232 interface 10V voltage required, especially for no 12V single supply system. With this principle, the same chip as well MAx202, ADs ADDtl01 and INl2 only SILs ICl232 chips.Implemented using discrete components Figure 3 shows the conversion interface implemented using discrete components RS-232-TTL level conversion interface circuit, which is characterized by the use of PC-BS-232 interface signal feet out (also available , feet ) to supply the negative supply, FC machine , , feet in the non-transmission logic 0 level are one level (-10V or so), the drive capacity of 20mA, using this characteristic, with a diode and an electrolytic capacitors, electrolytic capacitor that is acquired on the RS-232 communications required negative supply. The circuit is simple, low power consumption, in the absence of a dedicated chip when regarded as a workaround.The int