Design of 485 Communication System based
on
AVR Micro-controller
Abstract: Today's society is a digital era, the application of much-machine
communication systems have been widely seeped into the scientific
research in all fields ,such as: military technology, culture and the
arts, engineering and people's daily life. By means of communication
to exchange information, share resources has become an inevitable trend.
To make the system in data communication between multiple computer are
met, they must be composed according to the actual needs some form of
network engineering is often used to make a complete master sends and
receives signals from the much-machine communication mode, correct and
prevent the signal collision on the bus is guaranteed; This article
discusses the use ATmega16 AVR micro-controller to control RS485
serial interface with the host system for data exchange, ATmega16 core
chip, which is connected make remote distance transmission truth and
MAX485 converters, while ATmega16 as the main chip circuit control
buttons and data display circuit, system is mainly controlled by the
host module, communication module, data input module, data display
component modules, and analog-digital conversion module five parts, we
can use the RS-485 communication between SCM, realized through the
keyboard to select the machine from sending data, the host display
sending data. The system is a single-chip micro-controller receiving
sending another way, balanced transmission standard, has a strong
anti-jamming capability 、is easy to use、 easy to maintain、operate
and simple, in real life, also has a wide range of applications.
Keywords: much-machine communication、RS485 protocol、 AVR micro-controller