Commercial air conditioning industry present situation
　Following the time progress, technical development，people to security, convenient, comfortable, high efficiency, high quality artificial environment demand promote day by day, to reduce operation energy consumption, lengthen useful life of equipment to take seriously. From this promoted the intelligent construction rapid development, in the construction use BMS（intelligent construction integration management）system to realize optimized management to electromechanical device, achieve centralization, automation, intellectualization, thus save manpower and resources, enhance working efficiency, realize optimization estate management, in order to maximum economic efficiency.
　Commercial centralized air conditioning as electromechanical device's main equipment, also in unceasing innovate point of selling, integrate product point of increase. Below on the present domestic majority commercial air conditioning manufacturer 　product, basically has the following function characteristic:
　1、Each terminal equipment has a control panel separately to connect terminal equipment simulation quantity, digital quantity, induction equipment and so on, provides 485 or the TCP/IP communication interface, realize visible management.
　2、The partial manufacturer considered energy conservation aspect the intellectualized linkage, most chooses PLC programmable controller to come to own product to carry on the linkage management.
　3、The partial manufacturer have developed commercial air conditioning management software in view of own product, have realized system's management based on the WINDOWS platform's resources easy operational.
　Development trend analysis
　Forecast commercial air conditioning development detail, the present pattern already slowly inclines to Chinese brand, domestic product also in international had more applications, but the profession forerunner position is stable, aim at Kinglong product increment selling point and expense community's demand, to commercial air conditioning development direction induct as follows:
　1、Commercial air conditioning should realize network, Collecting-Distributing SMM.
　2、Commercial air conditioning should realize automated linkage mechanism, achieve energy conservation truly effect
　3、Can realize seamless integration with other intelligence construct system.
　4、Can realize malfunction monitor, untangle simplification, actual effect.
　Collection control solution
　1、BMS intelligence building system survey
　BMS system usually is called 5A system, respectively is BA（electromechanical device system）, SA（security system）,　FA（fire fighting system ）,CA（communication system）,OA（Office System ）. The most core, essential is BA system. 　Commercial air conditioning as host equipment centralized-controller of BA system is imperative.
　BMS system network architecture divides into three, the first is computer which has installed the BMS system software, is also called the central operation station, the central workstation, the central management station, upper computer, the central machine. Administrator can realize centralized management entire building equipment by computer. The second is the intermediate layer which is called control layer, there are the different control points DDC controllers, LonWorks/BACnet centralized controller and collector, the third is field layer. There are some terminal field equipment, sensor, driver and so on. To realize centralized management and disperser control, in other words a bad controller has not interfered with other controller work, computer halt does not interfere with controller normal work.



　2、Commercial air conditioning centralized-control solution
　Air conditioning equipment in – door unit and out-door unit already had corresponding 232/485 or the TCP/IP communication interface, already can as independent system by in the software control situation.
according to the above situation three dispositions to be as follows, enumerates by Lonworks (as shown in figure):
　Management layer: BMS system as well as related network appendix
　Control layer: “GEC”G-LON-C、“GEC”G-ETH-C2
　Equipment layer: can communicate with air conditioning equipment in – door unit and out-door unit


　Function realization:
　1、“GEC general centralized-controller” each has four 485 buses input, each bus supports 64 terminal equipments to access of homogeneous agreement, so everyone total can manage 256 terminal equipments, 8 inch touch screen can at any moment edit, monitor and control terminal equipment.
　2、“GEC general centralized-controller” built-in WEB－server, can realize in the network random to be authorized PC through the IE visiting way to monitor , setup, control terminal and so on function(as shown in figure).


　3、“GEC general centralized-controller” built-in building control international standard agreement Lonworks、BACnet and so on, can directly accesses to building control network, directly solves the compatible problem.
System function and characteristic: centralized monitor, long-distance diagnosis, long-distance monitor, long-distance maintenance.
To constitute system management, attemper, operation, and control strategy, make building’s electromechanical device economic and effective, optimized and energy conservation run.
To collect and analysis sampled data, automatically produces graph, includes history data, dynamic trend, equipment diagnosis, warning summarize and so on. Adopt the newest technical Windows graphical user interface, vividly monitors electromechanical device, convenient estate management, saving man-power. Counts equipment running time, carries on maintenance of equipment, maintenance management and so on.
　Has consummation and rich warning management program, including warning priority processing, warning message and correct processing method prompt, warning storage, warning report form, acousto-optic warning and so on.
Uses multi-duties, multiuser real-time operating system way, operator can observe the different duty Windows information on screen, switch between the Windows.
　Can carry on information sharing and effectively linkage with other subsystems in building by standard interface.
　Core product introduced
　①、G-LON-C centralized-controller
　This centralized-controller integrated LonWorks agreement，for“GEC”DDC（field direct controller）or the third party control device access LonWorks building control network. Through RS485 interface realize monitor to field device，through Ethernet interface realize communication with BMS control system.
　②、G-BAC-C centralized-controller
　This centralized-controller integrated BACnet agreement，for“GEC”DDC（field direct controller）or the third party control device access BACnet building control network. Through RS485 interface realize monitor to field device，through Ethernet interface realize communication with BMS control system.
　③、G-ETH-C1 centralized-controller
　This centralized-controller integrated WebServer service，for“GEC”DDC（field direct controller）or the third party control device access LonWorks building control network. Through RS485 interface realize monitor to field device，through Ethernet interface realize communication with BMS control system.
　④、G-ETH-C2 centralized-controller
　This centralized-controller integrated WebServer service，for“GEC”DDC（field direct controller）or the third party control device access LonWorks building control network. Through RS485 interface realize monitor to field device，through Ethernet interface realize communication with BMS control system.
　G series centralized-controllers hardware technology parameter: