In recent years, integrated circuit technology has
spawned the development of many low cost and high performance
microprocessors and microcontrollers. With these devices,
there is an increasing interest in the implementation of
distributed control networks, utilizing microprocessors in the
control nodes.
In this work, a low-cost liquid crystal display (LCD) unit
utilizing a Hitachi HD44780 controller was designed to provide
a visual display node for COLAN (Control Oriented Local Area
Network). An Intel 8051 microprocessor was used to provide
control services for the display and also to provide a
communication interface to the network. The users in the COLAN
network can remotely display and easily control the panel of
LCDs by sending commands to the display control nodes through
the local area network. This capability is especially useful
to provide instructions to operators, provide synchronization
for human interaction, and for use in locating faults in the
system.
The software necessary for implementing display and
control functions has been developed, including file transfer
and text transfer between supervisory nodes and display nodes.
This software fits within the task structure associated with
the COLAN communication protocols. The display node has been
designed, fabricated, and tested in a system involving
multiple COLAN nodes and a personal computer host.
The emphasis of this work is in the implementation of the
display control node and HD44780 controller including hardware
and software developments. The hardware work includes
designing and interfacing, and the software work includes high
level and low level language programming. / Graduation date: 1993
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36392 |
| Date | 28 October 1992 |
| Creators | Ji, De |
| Contributors | Herzog, James H. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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