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Application of Digital Communication in Intelligent Power Supply Panel for Railway Signal

Author: GaoJingMin
Tutor: DaiJuFeng
School: Tianjin University
Course: Communication and Information System
Keywords: Multi- CPU control ISD2560 SED1335 RS-422/485 Communication Protocol
CLC: TP273.5
Type: Master's thesis
Year: 2007
Downloads: 86
Quote: 1
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Abstract


The issue is with the Beijing Railway ICT Technology Development Co., Ltd. jointly developed railway signal smart power screen system project to meet the rapid development of rail transport for railway power supply systems. Monitoring of the whole system is divided into three monitoring: Power screen module itself monitoring, power monitoring module panel, remote or local computer monitor. The main subject for power monitoring module screen hardware and software design. Power monitoring module is a set of screen signal acquisition, signal records check, signal failure alarm, display, communications and other functions in one monitoring system for the realization of the voltage, current, switch status monitoring, and determine the operational status of the system power supply panel . Module uses a multi-CPU design, in order to improve system speed, enhanced data processing capabilities. 3 CPU were realized master and display, and the lower module communication, keyboard and voice alarm three functions. In the project design process, display control selects Japanese SEIKOEPSON company produced LCD controller SED1335, to ensure that the working environment is poor circumstances, graphic still clearly show. System extends an own battery of 512K 8-bit RAM chips HK1255, storage, including historical data, fault data, including a large amount of data, and the system is powered off, the data will not be lost. Systems use high clear voice alarm chip ISD2560, in order to achieve the system voice alarm function. While the system is also designed with X25045 composed watchdog circuit to ensure reliable operation of the system. To meet the application under the premise of the system as simple as possible to set, keyboard control using only \Monitoring module and lower communication between modules using RS-422 communication with the host computer using RS-485 communication. Board all communication line has the protection circuit, it is possible to reliably prevent lightning, power pollution, the communication line interference and damage. System software using C and assembly in two languages ??for programming, the program most of the contents using the C programming language, a number of subroutines in particular hardware-related routines using assembly language. The monitoring system has now been applied in the railway sector, and reliable system operation. The practical application shows that the system is the safe operation of the power panel systems to provide reliable power protection.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system > Computer control, computer control system
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