Research of one-wire bus distributed system based on token technology

Distributed systems are widely used in the field of measurement, control and monitoring alarm. The reliability of bus topology and overall costs are the key to distributed bus applications. This article analyzes the shortcomings of mainstream distributed alarm system, and proposes one-wire bus type token network topology. Then, one-wire bus driver circuit which supports wired-and function is designed, and data link layer protocol is given, include the frame structure, parity and bus arbitration. The design parameters are described in detail, and specific design elements and software processes are given. One-wire bus type token network topology is conducive to modular product design, clear structure, can significantly reduce the requirements of the microcontroller, and a significant cost savings. Therefore, it has some practical value.