User:Vadim.Sorokin.Wiki/sandbox

HDL-BUS control system is classified as distributed RS485-based bidirectional bus network for home and building automation systems. Ethernet-based backbone network Backbone network can adopt star topology, tree topology and ring topology, while bus network can only adopt bus topology. The bus network of HDL-BUS system adopts industrial standard bus RS485 bus mode, which makes bus in best condition at any time. Simultaneously it works in with unique HDL CSMA/CD intelligent control technology which can be combined with software/hardware to ensure it can obtain maximum transfer rate regardless of the bus device quantity and bus distance in the system. HDL-BUS system adopts open and high scalability protocol, which can link the system with any control system seamlessly. For example: BA (building automation) system, central control system, security system, remote meter reading system and stage lighting control system. HDL-BUS use a twisted pair to conduct two-way data transmission and supporting two-way real time communication. There is no master/slave structure in the system, backbone network adopts UDP/IP standard network, communication media, such as CAT5E twisted pair, optical fiber and wireless microwave, can be used as network media Basic technical characteristics:
 * 255 subnets (maximum) in each system
 * 255 devices (maximum) in each subnet
 * Each subnet has access to Ethernet by BUS switch (TCP/IP Unit)
 * Bus working voltage: DC24V


 * Total quantity of network device: 65 025


 * Bit rate: 9600 Bit/s
 * Distributed control system
 * Length of single physical bus: 1000m
 * Recommended quantity of BUS devices per subnet - 64 devices in single physical bus
 * Bus arbitration mechanism
 * Maximum data size in a data package: 80 bytes, CRC: CRC-16