了解使用ZigBee的無(wú)線照明控制的好處

　　介紹和產(chǎn)品重點(diǎn)

　　商業(yè)樓宇照明控制設(shè)備市場(chǎng)預(yù)計(jì)將從2010增加到2017倍，IMS研究項(xiàng)目年出貨量將達(dá)到6160萬(wàn)臺(tái)。為了滿足日益嚴(yán)格的能源立法，降低能源消耗是推動(dòng)這一增長(zhǎng)的最大動(dòng)力之一，美國(guó)能源部認(rèn)識(shí)到，照明占商業(yè)大廈能源使用量的25.5%。雖然美國(guó)可能會(huì)通過(guò)能源立法和相關(guān)的刺激方案來(lái)安裝照明控制，但歐洲和其他國(guó)家的其他國(guó)家正在看到這樣的系統(tǒng)的吸收，因?yàn)榻ㄖI(yè)主試圖減少他們自己的消費(fèi)。

　　目前安裝的照明控制系統(tǒng)使用有線和無(wú)線連接。無(wú)線通信中，使用最廣泛的技術(shù)是802.15.4標(biāo)準(zhǔn)，它定義了一個(gè)低速率無(wú)線個(gè)人區(qū)域網(wǎng)（LR-WPAN）也是ZigBee通信協(xié)議的基礎(chǔ)上?。到目前為止，很多系統(tǒng)已經(jīng)部署了專有的協(xié)議，但越來(lái)越多的公司，如樓宇自動(dòng)化公司Daintree的網(wǎng)絡(luò)和關(guān)鍵照明供應(yīng)商飛利浦照明系統(tǒng)，采用標(biāo)準(zhǔn)的解決方案，如ZigBee?促進(jìn)互操作性的需要。

　　本文將探討ZigBee的好處和它的網(wǎng)狀拓?fù)浣Y(jié)構(gòu)作為無(wú)線技術(shù)的選擇照明控制。更具體地說(shuō)，它將從領(lǐng)先的供應(yīng)商看一些?ZigBee收發(fā)器解決方案；對(duì)芯片的em351系統(tǒng)從Silicon Labs，Jennic jn5148-001模塊恩智浦和單獨(dú)的無(wú)線電和單片機(jī)解決方案從愛(ài)特梅爾（at86rf231和ATmega2560）；看到這些有助于更廣泛的生態(tài)系統(tǒng)。

　　Understanding the standards

　　The word ZigBee? is rapidly becoming another of those brand names like Hoover， Sellotape， and even Google that have become nouns and verbs， referring to generic products and actions; respectively a vacuum cleaner， clear adhesive tape， and searching the Internet. ZigBee? of course comes from the ZigBee? Alliance， a non-profit association formed in 2002 to provide open wireless networking standards focused on monitoring， control and sensor applications. The Alliance’s activities are very much determined by its members， which come from all around the world and include large and small companies， public bodies / government agencies， universities， and other interested parties. Consequently， a number of standards have been formulated to address the needs of specific markets and applications such as： ZigBee? Building Automation， ZigBee? Remote Control and more recently ZigBee? Light Link， a standard designed to provide LED lighting controls for consumer products.

　　The prime purpose of the ZigBee? standards is to provide equipment manufacturers with an open-source specification that enables them to develop interoperable products. As such， it is essential to understand what the standards cover and， just as importantly， what they do not cover. Networking， whether wired or wireless， is mostly based on the OSI model， which defines seven layers from the physical layer through to the application layer. ZigBee? defines networking protocols that operate from layer 3 upwards but does not define layers 1 and 2. Instead， it relies on 802.15.4， one of the IEEE’s 802.15 groups of standards for wireless personal area networks （WPAN）， to do this. This is often a source of confusion as devices that solely implement 802.15.4 may be referred to as ZigBee? transceivers when strictly they are not implementing any specific ZigBee? function， and are probably just as applicable to other low data rate WPAN applications supported by 802.15.4.