A text display node for a control oriented local area network Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4b29b861c

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  • 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.
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