  Public observatory project is playing more and more important role in science
popularization education and scientific research, and many amateur astronomers
also have began to build their own observatories in remote areas. As a result
of the limitation of technical condition and construction funds for amateur
astronomers, their system often breaks down, and then a stable remote
unattended operation system becomes very critical. Hardware connection and
control is the basic and core part in observatory design. Here we propose a
conception of engineering hardware design for public observatory operation as a
bridge between observatory equipment and observation software. It can not only
satisfy multiple observation mode requirement, but also save cost.
