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There is a lot of automation equipment in the scene of the industrial control, and the communications between the complex controller devices is a hotspot of research on industry control field. This article focuses on the subject of industrial automation equipment, developed the communication server with the core of AT91SAM9G25 microprocessor and MODBUS protocol, and expounds the principle and system composition from two aspects of hardware design and software design, implementing various industrial field bus compatible with each other through the communication server on the function, solving the communication barriers between different automation equipment manufacturers. Experimental results show that this equipment’s system structure is simple, the power consumption is ultra-low, the packet loss rate is low, and has a broad prospect of engineering application.