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1、外文文献翻译：The Designing of Serial Communication Based on RS232The Designing of Serial Communication Based on RS232AbstractThis paper discussed the principle of serial communication mainly, proposed the design method based on RS232, designed the hard circuit of serial communication, and realized the pro
2、gramming to PC Microcomputer and single chip microcomputer by using assembly language and C+ Builder separately.Keywords: serial communication; single chip microcomputer; program design.I. INTRODUCTIONDuring working in the control system, the PC microcomputer sends instructions for step-by-step moto
3、r to collect the image information. Therefore the communication between the PC microcomputer and the driving system is needed for the communication system. In general, a complete communication system consists of transmitter, receiver, converting the data interface and transmitting data channel. The
4、control of the step-by-step motor is realized through the pulse distribution by single chip microcomputer. On the motor control system, the PC microcomputer is called as upper computer, and the single chip microcomputer for driving step-by-step motor is called as lower computer. The communication be
5、tween the upper computer and the lower computer has two methods, that is to say the parallel communication and serial communication. Parallel interface can transmit much data at the same time and has the fast speed, but when the transmission distance is far and the number of data is much, it needs m
6、ore the number of transmission lines. In addition, the voltage level may be changed by the transmission line factor and electromagnetic interference. Serial communication is a one way that the data is transmitted by a bit in order, in which two transition lines is needed to realize bidirectional com
7、munication. It is taken into consideration that the data is much and the transmutation number is little, the serial communication is utilized in the control system so as to simplify the hardware and save the cost.Serial communication is one of the oldest mechanisms for devices to communicate with ea
8、ch other. Starting with the IBM PC and compatible computers, almost all computers are equipped with one or more serial ports and one parallel port. As the name implies, a serial port sends and receives data serially, one bit at a time. In contrast, a parallel port sends and receives data eight bits
9、at a time, using eight separate wires.For serial communication to work, you just need a minimum of three wiresone to send, one to receive, and one signal ground. For parallel communication, you need eight wires.Despite the comparatively slower transfer speed of serial ports over parallel ports, seri
10、al communication remains a popular connectivity option for devices because of its simplicity and cost-effectiveness. It shows some of the devices that use a serial port to connect to the computer. Using a serial port, you can connect to a modem, a mouse, or a device such as a bridge/router for confi
11、guration purposes.II. THE BRIEF DESCRIPTION OF SERIAL PORT COMMUNITIONSerial communication is the communication between sender and receiver data transfer is in the single data line, to move each time a bit. The advantage is that only a pair of transmission lines to send information, so its low cost,
12、 suitable for long-distance communications; its disadvantage is that transmission speed is low.As mentioned, a serial device sends and receives data one bit at a time. Some devices can send and receive data at the same time and are known as full-duplex devices. Others that can either send or receive
13、 at any one time are known as single-duplex.To initiate transmission, a device first transmits a start bit, followed by the data bits. The data bits can be five, six, seven, or eight bits, depending on what has been agreed upon. Both the sender and the receiver must be set to the same data bits for
14、communication to take place correctly. Once the data bits are sent, a stop bit is sent. A stop bit can be one, one and a half, and two bits. The baud rate is the speed of transmission of data from one device to another. Baud rate is usually measured in bits per second (bps).Most serial devices trans
15、mit in seven or eight bits.To detect that the data has been sent correctly, an optional parity bit can be included together with the data bits. A parity bit can be one of the following: odd, even, mark, space, or none (mark and space parity are almost always used). Using a parity bit provides a basi
16、c mechanism to detect corruption of data that was sent and does not guarantee that the data received is free from error. Nevertheless, a parity bit is useful for improving the integrity of the data sent.Most serial ports adhere to the RS232C standard, which specifies a connector either with 25 pins or with 9 pins. Most serial devices use the nine-pin connector.Serial communication with asynchronous communication and synchronous communication
