【 Weak current College 】 outdoor performance stage digital lighting control-Power By 【 China power house network 】

Outdoor performance stage digital lighting control
As digital technology in the rapid development of all industries, professional stage lighting field have gradually into the digital era. At present the domestic large-scale outdoor performances: Plaza party concerts of large and medium-sized and indoor-sized drama (including Studio) with professional lighting equipment, such as digital dimming lights, computers, digital silicon within control box, computer effect light, computer for lights, light computer color transfer, laser light, etc., the majority adopted the digital control. 　　And these devices are connected to each other how to achieve accurate control, realization of the overall scheduling stage lighting, is a vast number of lighting control have a headache. Modern stage lighting designers on stage lighting has proposed a new management philosophy — the unified management and centralized control. The effect of multiple features of digital lighting equipment are connected by a digital dimming and control. For example, we put the digital dimming Silicon case, numbers, change the color, computer effect light, computer for lights, digital smoke, numbers, bubble machine, etc. were all connected to a computer, console, by a lighting master to control. Practice shows that it is feasible. 　　This involved the industry are familiar with DMX 512 signal transmission system. DMX is an abbreviation for Digital Multipiex. 　　Translation into digital multiplexing Protocol, the United States Institute for theatre technology (USITT) have been defined, the production stage equipment manufacturers with the recognition and observance, as widely adopted digital light data protocol; that is, at this link in each managed units to meet the requirements of this Protocol, you can realize centralized control. DMX is RS422/RS485 serial transmission, data transfer rate of maximum 250Kbit/s loop control is 512 road (of course there are 1024/2048 loop, but it was on the basis of 512 and complex plus). 　　Due to the DMX signal transfer rates and the application of the special needs of the environment, the DMX signal cables, signal transfer interface and each cell of the signal transmission between has strict requirements to ensure the accuracy of the signal transmission. DMX allows effective transmission distance is 250m. Condition is to use high-quality signal lines, but also in construction to be placed in separate shielded tank; if mobile performance or external interference of serious place, to a corresponding reduction in the length of signal lines to shorten the transmission distance. If the project requires the signal line transmission distance should be greater than 250m meets retro 512 Protocol signal amplifier. 　　Usually a DMX512 interface can drive up to 32 digital equipment; if the receiving end all adopt DMX487 manifold block to receive a signal, then a DMX output interface is capable of driving 128 digital equipment. If a DMX512 system equipment exceeds 32 units, retrofit signal splitter, its role is to signal isolation, signal distribution, signal amplification. A signal distributor has 2 ~ 6 outlet (import of 4 ~ 8 outlet), a signal input, one loop interface, it can satisfy the small and medium-sized stage or studio lighting system signal distribution; if in a large square (Stadium), adding more than one signal distributor to meet system requirements. 　　In our stage practice, like this in a multiple unit centralized control link Riga installed with DMX512 signal distributor, in addition to zoom in on the signal, extend the distance of manipulation in Chi Gao he, an additional benefit is that if a lighting equipment failures (such as leakage, short circuit, etc.), the Distributor has a photoelectric isolation device that can effectively protect the link in the lighting equipment. In a multiple device unit of DMX link, the last signal interface lighting equipment should be installed "Terminal plug", as do for impedance matching, elimination of signal transmission in clutter reflection phenomenon, purification signal components. Then ensure that the normal DMX512 signal transmission system an important link. "Terminal plug" specific add-in method: in a five-card you "plug in 2 ~ 3 feet between welding a 90 ~ 120 Ω 1/4 W small metal film resistors, the size of its impedance should reference the dimming desk manual. Well, put it into the final piece of equipment for signal output. There are also some digital lighting equipment itself with a Terminal switch, the devices if placed at the end of the link, you should set the switch to allow location should be moved to an invalid location. DMX protocol request using the link five core plug-ins. In construction, that is, only three cores: 1, 2, 3, 4 and 5 core core blank. 　　Current lighting system majority of imported equipment and are based on five core interfaces. To sum up, do a large lighting system of centralized control, you need a clear concept construction personnel, standard installation in order to ensure reliable operation of the system. Thus ensuring large gala, major conferences, and other on-site smooth lighting effects.