BACnet collection controlling

1.Product introduction
　　GEC research and development this embedded product in order to satisfy the demand of central air-conditioning system access the BACnet building control networks.This controller realizes BACnet agreementstack conformed to the international standard in Linux embedded platform based on ARM system, completely satisfies the function which the BACnet standard requests, achieves the leading status in the domestic similar product, fully displayed the embedded product's superiority like cost lowly, run stably, maintain simply and so on.This controller contains a BACnet gateway procedure, provides condition data display and? control function to many (most reach 256) inside and outside hanging machine of the air conditioning,in addition, it also provided all the function of the central air conditioning ethernet controller.

Controller internal circuit outward appearance chart

2. Main performance index
　　Hardware technical index
　　CPU: Uses Samsung ARM9 S3C2410, basic frequency 200M
　　SDRAM: HY57V561620T 133MHZ, capacity 64M
　　Nand Flash: Samsung K9F1208VOB 64M
　　Interface:
　　One 232COM mouth:To monitor start and operating condition of the equipment
　　Two Ethernet-10M mouth: To send the gathered central air conditioning data message to remote?
　　Four 485mouth: To gather the air conditioning data, at present each control collector can hang 64 　　airconditioning inside machine or 32 air conditioning outside machine , inside machine can not mix hang with outside machine
　　One USB mouth: To debug; the official product can not use
　　LCD and keystoke interface: to realize the control collector monitor in local
　　Power supply: DC 12V
According to the industry level application request, the design realizes 7*24*365 uninterrupted run

Software technical index
　　The system provides the man-machine operation interface (LCD liquid crystal display) to carry on the air-conditioning system control in local for user, realiza control button function and display liquid crystal operation menu function.
　　The system passively receives the command of BACnet building management system for inquiry and control and give response;And not stop the circularly inquire the hanging air conditioning data and running status,and according to the premise-based to give the alarm forwardly to the building management system.
　　The system provides the BACnet intelligence building node control interface,realize docking the BMS system.Uses the communication agreement below with the BACnet building management system , choose one kind according to configuration files:BACnet/IP or BACnet/Ethernet.
　　The system support necessary BACnet standard object type and standard service
　　The system supports the BACnet object example automatic scan
　　The system support 256 Midea air conditioning inside machine,128 outside machine most
　　The system can discover the new air conditioning,and scan the air conditioning running status automatically.
　　Realize cooperation with ethernet data acquisition, provide the long-distance monitoring and the management function, user may set the intervals of time gain data freely, realize dynamic gaining detailed data of commercial air conditioning and saving,time preserving the data to SDcard , the time preserving the data to be possible for a year.

3.function
　　Local access: Provides 3.5 inch colored LCD touch screen or keystoke management controller.
　　Remote access: Built-in Web server, visit controller through Web browser, carriy on the remote management.
　　Intelligent work: need no enactment, automatically search the air conditioning equipment hang on the RS485 Bus.
　　BACnet: Supports the BACnet standard object type and the standard service, Automatically produces the BACnet object according to the airconditioning equipment type, for BMS system using.
　　Data storage: Preserves the air conditioning performance data in the SD card for at least 1 year, for breakdown diagnosis.
　　Centralized monitoring: The controller data is transmitted to the long-distance control center by the gathering, realize the remote the estate monitoring, the breakdown diagnosis, the short note control and so on.
　　System capacity: Altogether 4 RS485 Bus interfaces may be use, each interface can connect no more than 64 air conditioning inside machine or 32 air conditioning outside machine or one air conditioning inside and outside machine control collector.
　　Security: Use encryption user password mechanism guarantee the system far awary from external security attack.
　　Stability: According to the industry level application request, the design realizes 7*24*365 uninterrupted run.