【正文】 d on the mands they receive from the main HVAC zone control panel and temperature sensors. An alternative way of implementing a multizone control system is to connect the zone control panel, motors, and temperature sensors via wires instead of a wireless work. A wired syste m has less flexibility and additional labor cost for wiring, but the cost of the parts might be slightly lower. Total system cost and flexibility for future modifications should be the decision factors in selecting between these two implementation methods. Consumer Electronics: Remote Control In consumer electronics, ZigBee can be used in wireless remote controls, game controllers, a wireless mouse for a personal puter, and many other applications. In this section, we briefly review the application of ZigBee in wireless remotes. An infrared (IR) remote controller municates with televisions, DVDs, and other entertainment devices via infrared signals. The limitation of IR remotes is that they provide only oneway munication from the remote to the entertainment device. Also, IR signals do not perate walls and other objects and therefore require line of sight to operate properly. Radio frequency (RF) signals, however, easily perate walls and most objects. IEEE is a proper replacement for IR technology in remote controls because of the low cost and long battery life of ZigBeebased wireless munication. IEEE can be used to create twoway munications between the remote control and the entertainment device. For example, song information or onscreen programming options can be downloaded in to the remote itself, even when the remote control is not in the same room as the entertainment device. Industrial Automation At the industrial level, ZigBee mesh working can help in areas such as energy management, light control, process control, and asset management. In this section, application of ZigBee in asset management and personnel tracking is briefly reviewed. Asset Management and Personnel Tracking Passive radio frequency identification (RFID) tags have been in use for several years. Although a passive RFID tag does not have any battery, the RFID reader unit can be a batterypowered instrument. A passive RFID tag can transmit only simple information such as an ID number, which is sufficient for many asset management applications. Active RFIDs, such as ZigBee devices, are battery powered and generally are more expensive than passive RFIDs. ZigBeebased active RFIDs have longer range than passive RFIDs and can provide additional services such as estimating the location of assets or personnel. Chapter 7 covers the details of ZigBeebased location methods. The basic concept of location estimation is shown in Figure , where location of personnel is tracked inside a typical office building with offices and cubes. There are three fixed ZigBee nodes with known locations. The mobile ZigBee node, carried by an employee, broadcasts a signal that is received by all three fixed nodes. The signal bees weaker as it travels longer。然而 ， 如果應(yīng)用 很簡(jiǎn)單 ，也 可能 僅使用 IEEE 。 基于ZigBee的 安全系統(tǒng) 簡(jiǎn)化了安全系統(tǒng)的 安裝和 更新過程 ?；?ZigBee 的 無線設(shè)備不僅執(zhí)行監(jiān)控 任務(wù) ， 他們 還 可以 通過和室內(nèi)的裝置通信來管理使用高峰期 。 例如，安裝一個(gè)新壁燈的時(shí)候，需要一條新的到開關(guān)的電線。 使用綁定表的概念也適應(yīng)于圖 。 HVAC分區(qū)系統(tǒng)通過控制每個(gè)房間的空氣流動(dòng)可以幫助節(jié)省能源，避免對(duì)不必要的區(qū)域進(jìn)行冷卻或加熱。 紅外（ IR）遠(yuǎn)程控制器通過紅外信號(hào)與電視， DVD 和其他娛樂設(shè)備進(jìn)行通信，紅外遙控的限制就是它們只提供從遙控端到娛樂設(shè)備的單方向通信。 資產(chǎn)管理和人員跟蹤 被動(dòng)式射頻識(shí)別（ RFID）