Identification, familiarization of unfamiliar RAM and initialization of system parameters First of all, the program cannot initialize the system parameters to the default values ​​every time it is started and run. One is because it is very troublesome to set the system parameters every time it is turned on. This is because the watchdog reset system will change the control parameters to the default values ​​when the system is restarted. The operator does not necessarily know that the instrument has been reset, and it is dangerous that the control parameters cannot be modified in time. Secondly, the program cannot simply use the data of the specified address unit in the RAM chip as a parameter stored in the past, because the current RAM chip may never be used, it is an unfamiliar chip, and all on-chip random numbers. Therefore, the program should have the ability to identify the RAM chip. When the chip is an unfamiliar chip, set all parameters to the default values, and mark the RAM chip with a soft tag to make it familiar. When the chip is not unfamiliar, use the unit ’s parameter. The method of marking is to write a set of numbers with distinctive characteristics among several units fixed in the RAM chip. The program reads the numbers in these units and the number of logos every time the computer is restarted. If they are inconsistent, it is unfamiliar. Chip, and proceed accordingly.
This paper carefully analyzes the problems related to the use of non-volatile RAM for data storage and protection. On this basis, the pointer data is used to solve the problem of the definition and address coincidence of permanent data. The method of marking the RAM chip is used to solve it. In order to solve the problem of initialization of control parameters brought about by the replacement of RAM chips, the entire processing process is transparent to the use, installation and debugging personnel. After the actual application of a certain type of instrument, the historical alarm data can be stored in a large amount. There is no need to reset the parameters when the system is powered on. The historical alarm data is automatically cleared after the RAM chip is replaced, and the parameters are restored to the default values, indicating that this method is easy to use and has relatively high reliability. high.
24 port PoE 10/100/1000M managed network switch/POE Switch/10/100/1000M 24 port POE
Managed POE Switch is designed for Video surveillance and network project system,etc.it provides 24x100Mbps Ethernet ports; 2x10/100/1000Mbps ports &2x1000 Base-X SFP optical fiber port as uplink ports; supports Web& CLI management,two layer network management and POE Intelligent management; supports data wire-speed and Jumbo Frame forwarding .Port based VLAN function can effectively prevent whole system from broadcast storm so that make the date transfer safer.The 16*10/100Mbps POE Switches complies with IEEE802.3 af/at standards,it simplifies wiring,avoids the troublesome of installing power socket for powered devices,such as
Features:
- Provide 24x 100Mbps ports; 2x10/100/1000 Mbps port & 2x1000 Base-X SF Poptical fiber port as uplink ports
- Support End-Span method,complies with IEEE802.3 af/at standards,flexibly configures power for each port.
- Support L2 switching function,including 802.1QVLAN,port mirroring, port isolation,IGMP Snooping function.
- LLDP,POE+Management and ARP detection.
- Support WEB,CLI,TELNET&SNMP management
- Support 10K Jambo Frames
- Support STP(802.1D) and RSTP(802.1W)
- Support IEEE802.3x full-duplex flow control,support Auto MDI/MDIX
- Restart funtion helps master IC reset wholly,Easy for users to solve network failure
- Without swapping power supply,easy to maintain system,help monitoring pictures ,recover quickly.
- Excellent lighting protection,lightning capacity up to 2KV.
Application:
- Security Monitoring system
- Multimedia Network Teaching System
- Medical Monitoring Display System
- Industrial Automation Control System
- Banking ,securities,financial information display system
- Remote Network Server Monitoring
- Department Store Security
- Casino Security
- Hospitals,Airports and banks
- School Campuses
Gigabit Standard Managed Poe Switch
Gigabit Standard Managed Poe Switch,8 Port Poe Switch,250M Poe Transmission,Giga Managed Power
Guangdong Steady Technology Co.LTD , https://www.steadysmps.com