其次对现场设备，人们要求它具有相应的通信能力，即要求它具有工业以太网的智能通讯接口。
Secondly people want field equipments have intelligent communication interface , that is , equipments must have the corresponding ability of communication with each other.
单片机是将运算器、存储器、定时器、模数转换器和串行通信接口等集成在一个芯片上的小型计算机系统，它可以被嵌入到各种自动控制器和智能电子产品中。
Microcontroller is a small computer system that integrates ALU, memory, timer, ADC, UART, etc in one chip. it can be embedded into many kinds of controllers and intelligent electronic products.
通用串行总线(usb)作为一种新型微机总线规范，具有便捷易用、传输速率快、低干扰等特点，非常适合作为现代智能仪器的通信接口。
USB is a kind of novel PC bus criterion. With the quality of fast speed, convenience and low interference, USB is the most available communication interface of modern intelligence instrument.
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