【作者】 张恒；

【导师】 张继国；

【作者基本信息】 河海大学 ， 通信与信息系统， 2004， 硕士

【摘要】 基于以太网的新技术和联网设备不断出现，网络化设备成为了以后发展的方向。现今的许多单片机应用系统基本上是基于轻型网络(如RS—232／RS—485、CAN总线等)的应用系统，串口总线的种种缺陷使得仪器难以真正网络化。 本文以读卡器上网为开发背景，对实现嵌入式环境下的网络通信的TCP／IP协议族作了阐述分析。在此基础上，设计了一个网络化单片机读写卡系统，它利用sst89c54、以太网络接口芯片和相关外围接口电路实现系统的硬件架构，该系统能直接接入以太网；软件上，根据8位单片机本身资源有限的特点，精简了TCP／IP协议族，包括UDP，ICMP，IP，ARP，使之运行在8位单片机上，实现了远程读写卡操作。针对UDP协议传输的不可靠性，作者设计了从网络读卡器端和网络服务器端同时进行可靠性传输的保证机制。 本课题所设计的网络读卡器针对性强，经过一定的改进后，可以广泛的用于以以太网为通信网络的IC卡应用系统中，具有广泛的应用前景。更多还原

【Abstract】 To realize Internet in embedded system is the hot spot of present time. But now ,most embedded system is by way of the mutual connection of RS232/485 bus or CAN bus and PC.The paper background study of Internet read/write unit represents and analyses TCP/IP suit for realizing network communication in embedded environment. Then, we design a networking IC card terminal units that makes use of sst89c54-MCU, NIC of Ethernet and relative peripheral interface circuit. It can be linked the Internet through the Ethernet. On software, we simplify TCP/IP suit, including UDP, ICMP, IP and ARP,made it run in 8-bit MCU, to implement the reading and writing functions of IC Card. Because the reliability of UDP protocol is not well, The author design a protection-mechanism of reliability transmission which is going on from networking IC card terminal units to pc.The networking IC card terminal units designed in the research job aim at given direction, Which pass through some improvement can widely used in IC card applied system which Communication system based on Ethernet.更多还原