This paper briefly introduces the foreign technical current situation and the developing trend on this field, and simply introduces the work that have been done on the automotive multiplex system.

Using single chip as the core, the paper studies a way to realize multiplex low speed data serial transmission, presents hardware connection chart, expounds work principle and software design idea.

Mainly accepts the fire engineering installment and the property development, the company strength abundant excellent service, present construction work 10 multiplex.