使用51单片机自带的10位分辨率的AD进行模拟量的采集，将采集到的数据通过串口发送给上位机-Use the 10 bits of resolution 51 SCM AD analog collection, the collected data through the serial port to the PC.

这个一个为煤气厂做的蒸汽压力采集程序。带COMM接口库LIB。-this program is to get gas pressure from COMM port. with COMM program library

ModBus网络是一个工业通信系统，由带智能终端的可编程序控制器和计算机通过公用线路或局部专用线路连接而成。其系统结构既包括硬件、亦包括软件。它可应用于各种数据采集和过程监控。(The ModBus network is an industrial communication system, which is made up of programmable terminals with intelligent terminals and computers connected through p