The Design Of An Embedded Momitor & Control System For UPS Based On SNMP

UPS (Uninterruptible Power System), an uninterruptible power system, is an important equipment that can provide sustained, stable and uninterrupted power supply for computers and other electronic devices. When electricity is instable in the city, UPS can avoid the equipment suffering from a sudden power failure, surge impact and other hazards, in order to make them work more stable. However, UPS back-up time is limited, and during its work-time it may bring about a variety of special anomalies. UPS managers need understand the exact run-time power environment of the equipment at any time and master the UPS's work state. Recently, UPS uses the strategies that RS232 or RS485 serial port will control the equipment, and the management methods of manual work on duty. When the UPS scattered at different geographical location, the transmission distance will be constrainted. Smart UPS is the trend of its today development, communicating with the computer through integrated network interfaces, so that the administrator can monitor and control UPS through network and realize distributed management. Network communication protocol is SNMP (Simple Network Management) protocol. SNMP are widely used for its advantages, that is simple and flexible, its small network load, be stable and easy to realize in large-scale network on the Internet, it has become protocol standards based on the TCP / IP network management.This paper describes the working principle of UPS and UPS model, introducing a monitoring system, analyzing the composition of UPS monitoring system and the development of monitor technology at present, and proposing a programe of embedded monitoring system for UPS based on the SNMP. The programe is designed as a SNMP hardware card based on S3C4510B andμClinux operating system, completing the transformation from serial interfaces to the network for UPS, realizing the objectives of monitoring and managing the UPS system through network.In this paper, the hardware circuits have been introduced, such as S3C4510B external power supply circuit, memory expansion circuit and Ethernet control and drive circuit, showing the process of debugging for these circuits respectively.The embedded software have been made in the monitoring system. The paper . introduces Bootloader porting,μClinux porting and the development of SNMP packages, focusing on the expansion of snmpd agent and the SNMP-based applied design withμClinux. It definites UPS monitoring contents, designing the MIB database, and achieving the changes from serial monitoring to SNMP-based network monitoring and the design requirement basically through the analysis of serial MegaTec protocol.Finally, the paper presents the results of the system tests and the completed situation, with the representation of some weak points and future directions.