Sep. 22, 2013
J&H Emirates LLC
PO Box 113328, 3^rd Floor, AUH Business Hub, Mussaffah, Abu Dhabi, UAE
Tel: +971 25506060 Fax: +971 25506061
PROJECT:  ADNOC New Corporate Headquarters
SUBJECT：About DMX
 
ATTENTION: Mr. Matthew
CC: Mr. Tony Wang
 
 
Dear Mr. Matthew,
关于DMX与广茂达的灯光控制系统兼容性的问题，做出如下答复：
As to the compatibility of lighting control system between DWX and Grandar, we wish to give the following in reply:
1、广茂达控制系统和DMX512控制系统兼容性体现在以下方面：
1、The compatibility between the Grandar control system and the DMX512 control system is mainly embodied in the followings：
1）广茂达灯光景观照明控制系统服务器与LED主控制器间的通讯架构是基于UDP协议，此通信协议是一个开放性通用协议；DMX512系统服务器与DMX512控制器间的通讯架构也是基于UDP协议。故从通信协议上，广茂达控制系统和DMX控制系统服务器端与控制器端在通讯协议上是兼容的。
1）The communications architecture between the lighting landscape lighting control system server of Grandar and the LED master controller is based on the UDP protocol, which is a open general protocol; the communications architecture between the DMX512 system server and the DMX512 controller is also the UDP protocol. Therefore, with regard to the communications protocol, the Grandar control system is compatible with the ports of the DMX control system server and controller.
2）广茂达服务器端与LED主控制器端硬件系统架构是通过交换机、标准网线进行组网联接，DMX512服务器端与集成控制器在硬件架构上也是通过交换机、标准网线进行组网联接，所以广茂达控制系统和DMX控制系统在硬件连接和组网上是兼容的。
2) The hardware system architectures between the Grandar server port and the LED master controller port are linked by the switch and standard cable in network, So are the hardware architectures between the DMX512 server port and the integrated controller. As a result, as to the hardware connection and the network, the Grandar control system and the DMX control system are compatible.
因此，广茂达灯光控制系统架构具备了与DMX系统兼容的硬件基础。为了保证整体的艺术效果能够实现，为了保证项目的质量、寿命要求，为了保证这个项目后期系统的稳定运行，我们现在正在进行进一步的研究验证工作。
Therefore, the architecture of Grandar lighting control system is equipped with the hardware basics, which is compatible with the DMX system. We are now doing the future research and verification to guarantee the overall artistic effect, the quality and lifespan of the program,and to make sure the stable operation of the system in the later period.
另外，关于广茂达控制系统与DMX512控制系统在符合项目需求性的对比分析如下。
In addition, the comparative analyses , corresponding to the demand of the project, between the Grandar control system and the DMX512 control system, are as follows:
We analyse the condition and requirement must be fulfill according to achieve the lighting effect at south façade.
1) Lighting effect at south façade should be approved.
2) To realize the effect, we need about 16000 pixels, each pixel consist of 5 color( RGBWA), the control system and bus must control each pixel precise and independent dimming control.
3) In term of demand, signal should have redundancy, whole control circuit can’t be influent by one damaged lighting fixture.
4) Analyse in term of maintenance, control system and bus can detect fault online, accurately find fault position and save the testing result.
Control system and bus project of our company can absolutely fulfill the demand according to the above requirements.
1) We have realized lighting effect at VMU and benchmark as south façade lighting, which has been approved and successfully realized the lighting effect
2) Our control system and bus can control more than 300 pixels(RGBWA) on each control circuit, the control system and bus can control each pixel precise and independent dimming control. The maximum control pixels reach more than 80 thousand with our control system and bus, all great projects operate reliable and stable such as Water cube, Expo axis,
Hamara the highest building at Kuwait
3) Our control system and bus have redundant function. Signal cable of each lighting fixture has 2 channel for mutual backup, when one control signal circuit has fault, the other control signal can seamless switch, improve the system reliability.
4) Our control system and bus have real-time feedback function which can realize real-time fault detection online, feedback to the server and save the results. It’s more convenient and time-saving when system maintenance.
5) Our system control and bus have auto address online function, when ighting fixture have fault during installation and testing and need to be eplaced, we don’t need set the address one by one at site. After all fault ighting fixture have been replaced, auto address at control system server within 10 seconds which is very convenient.
6) Our lighting fixtures own anti-reverse connection and anti-error connection function, if power cable misconnected with signal cable at site, it won’t harm
to the lighting fixture. It’s company’s core patent and has great help to the construct.
According to above needs, by using DMX512 system will lead to below problems.
1) One control channel of DMX512 only supports 512 data channel, it can only control about 100 pixels which consists of 5 color(RGBWA). 16000 pixels need 160 control channel at least. While Grandar control system and bus only take no more than half of it. In term of reliability and convenience principle, Grandar control system and bus is much better than DMX512
2) DMX512 without signal redundant function, when signal channel has fault, at least one lighting fixture is out of control. To this point, Grandar control system and bus is more reliable.
3) DMX512 without feedback online function. When lighting fixture has fault, system can’t locate the faulty position, manul operation instead which cause inconvenience in maintenance and repair
4) DMX512 is parallel system, when short circuit happened between two signal cables, or signal cable to ground, or signal cable with power cable, whole circuit fail to work. While Grandar control system and bus is tandem system with redundant and feedback function, it’s very convenient in solving these above problems
5) DMX512 system without auto address function, when location of the lighting fixture is not satisfied with effect needs cause by construction, DMX512 system can’t independent control each pixel or mis-control result to error lighting effect.
2、针对石油大厦项目，广茂达及代理商会承诺提供产品及系统的质量保证，并确保10年内系统正常运行。
2 As to the Oil Mansion Project, Grandar and its agents promise to guarantee the quality of the products and systems with the normal operation within 10 years.
3、针对石油大厦项目，广茂达及代理商会根据系统维护率提供备品及实际的实施方案，确保10年内系统正常运行。
3 As for the Oil Mansion Project, Grandar and its agents will, based on the system maintaining rate, provide spare and the practical plans to guarantee the normal operation of the system in 10 years.
 
 
David.Wang
Project Manager
Shanghai Grandar Light Art and Technology Co., Ltd.

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