FAULT DETECTION OF THE DATA DISPLAYING SYSTEM IN MARINE CENTERS

Document Type : Original Article

Authors

1 Post graduate student, Suez Canal Authority, Egypt.

2 Dr., Air Defense College, Alexandria, Egypt.

3 Professor, Electronics and Communication Department, Tanta University, Egypt.

4 Dr., Director of Planning and Researches Department, Suez Canal Authority, Egypt.

Abstract

Abstract
This paper presents a comprehensive analysis of the vessel traffic management system
(VTMS). It is shown that displaying system includes the signal state board, with its four
driving boards, and station PC. Each driving board feeds one row. We show that, as an
example, Row 2 contains six (7 × 5dot matrix) modules and each dot has its own flipping coil.
In addition, each driving board has 58 Darlington transistors. The address and data lines of the
processor Z80180 are used to control the flipping circuit through decoders, addressable
latches, buffers and inverters. Interrupt circuit generates signal INT1which is used by the
processor to switch off all transistors after each dot flipping process. We have built an
assembly EPROM program to deal with the two assembly subroutines, activated by INT1and
INT 2 interrupt signals, to detect faults associated with the flipping circuit transistors. We
performed a new visual basic program(paper under publication) in the station PC to handle
the detected faults by EPROM program.This work is illustrated practically by tracing
measured signals at different points for the example of short and open transistor.

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