A Design Of Remote Data-Acquisition System Base On Embedded System

With the development of computer and communication technology, the more and more extensive using of Internet and embedded intelligent instruments made the society get into the Post-PC time. In the domain of embedded application , how to control and acquire data from the instruments through the Internet become the research hotspot in the world.The use of most embedded instruments are limited from the communication style of RS232/485 and CAN at present, because it will spent too much source to build the communication network and it can not spread far enough. Although the instruments with the function of accessing the Internet have been developed by some famous international companies , but it is too expensive to use extensively.How to combine the embedded instruments with Internet become a urgent need problem.In view of these case, using the embedded system technology, serial and Internet communication technology, this paper does research on embedded gateway and data-acquisition In order to build a inexpensive and practical remote data-acquisition platform and combine Internet with the instruments already existed.This paper put forward a design proposal by studying a lot of literatures all over the world and investigating the development of embedded instruments. In this design , the 32bit MCU LPG2132 are used as the kernel chip, which is based on ARM technology and runs faster than others, meanwhile, it has the ability of expanded using in the future because of abundant peripheral resource; By comparing to other products at present, the design choose ENC28J60 as the network interface module, which is produced by Microchip and has the advantage in hardware and software design; In this design, theμC/OS-II operation system is transplanted into LPC2132 to optimize the control ability,anti-jamming ability and real-time function; The light-weight TCP/IP stacks lwIP is also transplanted into the operation system to come true the communication on Internet.This instrument can be used wildly in the domain of data-acquisition and remote data-transport, it can also be used as a gateway between RS485 and TCP/IP. For example, it can transport the data of temperature,humidity of a house to a remote PC, and the PC can control the switch output on the instruments as needed.Finally, the paper design experiments to validate the system function of gateway,data-acquisition and data-transport. the shortage and the improved idea is also pointed out and the preparation is made for the further research in future.