With the continuous development of new technologies, interconnection of fire alarm controller there are increasingly high requirements. Fire alarm controller must not only complete the machine alarm linkage, and other functions, but also to send warning messages to other controller or alarm system. In this paper, based on the CAN bus fire alarm system, the system of arbitrary alarm controller can be equal on the bus from receiving other Alarm Controller alarm information, or other alarm controller issued a directive to overcome the "main from the "communications of all information must be exchanged through the mainframe shortcomings.
1, Introduction CAN Bus with computer hardware, software and integrated circuit technology to the rapid development of industrial control systems have become computer technology in the field of a branch of the most dynamic, and has made tremendous progress. Because of the system's high reliability and flexibility requirements, the development of industrial control system mainly as follows: control-oriented diversified, decentralized systems-oriented, that is, load dispersed, decentralized function, dangerous scattered, and geographically dispersed.
