PLC专业外文翻译--串口通信基础
4页1、外文资料The foundation of Serial Port CommunicationThe string mouth is on the computer one kind of extremely general purpose equipment correspondence agreement (does not want and universal serial bus USB Universal Serial Bus or the USB confusion).The majority computer contains two based on the RS232 string mouth. At the same time the string mouth also is the instrument instrumental equipment general correspondence agreement; The very many GPIB compatible equipment also has the RS-232 mouth. At the s
2、ame time ,strings together the mouth correspondence agreement also to be allowed to use in to gain the long-distance gathering equipment the data. The string mouth correspondence concept is extremely simple, strings together the mouth (bit) to transmit and the receive byte according tot he position. Although presses the byte (byte) the parallel correspondence is slower than, but the string mouth may use a line transmission data simultaneously to use another line to receive the data. It is very s
3、imple and can realize the remote communication. When for instance IEEE488 defines the parallel general condition, stipulated the equipment line always often does not have to surpass 20meters, and will fully lengths between two equipment do not have to surpass 2 meters; But says regarding the string mouth, the length may amount to 1,200 meters.The typical place, strings together the mouth to use in the ASCII code character transmission. The correspondence uses 3 lines to complete:(1) the groundin
4、g, (2) transmits, (3) receives. Because the string mouth correspondence is asynchronous, the port can transmit the data while on-line to receive the data in another on-line. Other lines use in to shake hand, but is not must. The string mouth corresponds the most important parameter is the baud rate, the data position, stops the position and the parity check. Carries on the general porter regarding two, these parameters must match:A, baud rate: This is a weight correspondence speed parameter. It
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