1).Main Functions of Ultrasonic Detector . ultrasonic detector,as one of the main part ofcarpark guidance system makes use of ultrasonic detecting the parking space to get message and transfer to ZCU or other equipments by RS485. . One parking space needs one UD which is installed in the middle of the car park space. . Using network cable to connect the PGS components makes the installartion simple. 2).HowCarpark Guidance System Works: Firstly, Ultrasonic detectortakes use of ultrasonic wave to detect the car space to see if it is occupied by vehicles and transfer relative command to LED Indicator which will turn from green to RED when occupied, or it will keep GREEN; meanwhile, the UD transmit its status message to ZCU immediately, and ZCU will collect and forward the information to CCU; CCU processes these data and sends the relevant command to ZCU and LED panel. 3).Cases: Changi Airport,Singapore(3850 lots) Krakow Airport(1160 lots) other cases: 12 April,2008 1200 cars Singapore City Square Mall(OEM) 13 April, 2008 310 cars IndonesiaCambridge city square of Medan 14 April,2008 300 cars WuxiYAOHAN(800buy) Department Store 15 May,2008 200 cars ChangchunCHARTER Shopping Center 16 May,2008 700 cars TianjingRailway Station 17 May,2008 200 cars WeifangJiaLeJia supermaket 18 May,2008 1000 cars BeijingSOLANA Lifestyle shopping park 20 August,2008 200 cars JapanShin-TokyoBuilding(TOKYO Marunouchi) 21 August,2008 70 cars Beijinghongqiao pearl-market 22 Sep,2008 3160 cars PhilippinesMall of Asia (Manila SM) 23 Oct,2008 1500 cars SingaporeHarbourfront Centre(OEM) 24 Nov,2008 320 cars ThailandKasikorn Bank 25. Feb,2009 241 bays Xuchang PANGDONGLAI Plaza 26. April,2009 105 bays Spain OviedoBus station 27. May,2009 330 bays Chengdu CNPC South China branch 28.May, 2009 109 bays Beijing Ocean family 29.June,2009 650 bays France Alizes 30.July, 2009 890 bays Kunming THE TWIN TOWERS 31. July,2009 1700 bays Philippines SM megamall 33. Aug, 2009 170 bays Slovakia CASSOVAR 34. Aug, 2009 158 bays Iran Shiraz shopping mall 35. Sep,2009 50 bays Norway subsea7 office building