文件名称:tx
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所谓“串行通信”是指外设和计算机间使用一根数据信号线(另外需要地线,可能还需要控制线),数据在一根数据信号线上一位一位地进行传输，每一位数据都占据一个固定的时间长度。这种通信方式使用的数据线少，在远距离通信中可以节约通信成本。在简单的应用中， 只需要有3条线即可完成通信， 分别是 第二脚RXD , 第3脚TXD ，第5脚GND。串行通信与单片机之间的接口：由于串行通信的电平逻辑定义是+15V（ 高电平1）-15V(低电平0) 而单片机中分别用5V ,0V 来表示1,0 它们之间必须通过电平转换才可以完成通信。 最常用的是用芯片MAX232组成的电路。
-The so-called " serial communication means between the peripherals and the computer using a data signal line (another ground, and may also need to control lines), the data in a data signal line A A transmission, each bit data occupy a fixed length of time. Fewer data lines used by this communication, the communication cost can be saved in long-distance communications. In simple applications, just to have three lines to complete the communication are second foot RXD Pin 3 TXD pin 5 GND. Interface: serial communication between the microcontroller serial communication level logic defined+15V (high level 1)-15V (low 0) microcontroller with 5V, 0V to represent 1,0 they of between level conversion must be completed. communication. The most commonly used is the circuit composed of MAX232 chip.
-The so-called " serial communication means between the peripherals and the computer using a data signal line (another ground, and may also need to control lines), the data in a data signal line A A transmission, each bit data occupy a fixed length of time. Fewer data lines used by this communication, the communication cost can be saved in long-distance communications. In simple applications, just to have three lines to complete the communication are second foot RXD Pin 3 TXD pin 5 GND. Interface: serial communication between the microcontroller serial communication level logic defined+15V (high level 1)-15V (low 0) microcontroller with 5V, 0V to represent 1,0 they of between level conversion must be completed. communication. The most commonly used is the circuit composed of MAX232 chip.
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通信.ASM