针对目前大部分停车场系统还停留在RS485小范围内组网的问题,提出一种以AT89C52单片机和以太网控制芯片ENC28J60为控制核心的以太网/RS485互联新方案;该方案采用C/S通信模式,以AT89C52为控制网关,通过ENC28J60接人以太网,实现对停车场系统的远程监控和数据共享.详细阐述了以太网/RS485转换接口电路的硬件设计和软件设计;该方案无需改变现有硬件电路.通过在停车场系统中的实际应用,验证了该方案设计合理、成本低及可靠性高的优点.%Most parking systems remain using the RS485 network. This kind of system only can be used in a small region. In order to solve the problem, a scheme based on AT89C52 MCU and ENC28J60 Ethernet control chip is proposed. The scheme uses C/S mode, with the AT89C52 to control the gateway and through ENC28J60 to access the Ethernet, realizing remote monitoring and data sharing in the parking system. The hardware and software design of the Ethernet/RS485 Interface Circuit are introduced in detail in this paper. The scheme has no need to change the existing hardware. Application shows the design is reasonable, low cost, high reliability.
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