单芯片以太网的开发及其在电气自动化中应用

针对传统串行通信方式不能满足电气设备在线检测和继电保护的现实,提出了采用TCP/IP技术的实时信息传输方案。系统采用MC9S12NE64芯片构成嵌入式以太网解决方案。该单芯片集成有FreescaleCPU12内核和10/100Base-T以太网,只需1片MC9S12NE64芯片、1个以太网变压器、1个RJ45接口就能构成最小系统。系统工作在内嵌以太网控制器的驱动的基础上,通信协议采用经改造的TCP/IP协议,且设计实现了一个串口(RS-232)转以太网的网关和一个内嵌Web服务器。详细讨论了其在备用电源自动投入装置的实时通信和发电机在线监测中的应用。

Development of singlechip Ethernet and its application in electrical automation

As the traditional serial communication could not meet requirements of on-line detection and relay protection of electrical devices,a scheme based on TCP / IP technique is presented for real-time data transmission.MC9S12NE64 chip is used to construct embedded Ethernet system,which integrates a Freescale CPU12 core and a 10 /100 Base-T Ethernet interface.The smallest system only needs one MC9S12NE64 chip,one Ethernet transformer and one RJ45 connector.Based on the hardware driver of integrated Ethernet MAC,the modified TCP / IP stack protocol is adopted.A gateway of RS-232 to Ethernet and an embedded Web server are designed.These applications to the real-time communication of automatic bus transfer equipment and the on-line monitoring of generator are discussed in detail.