parking guidance system

1.Central Controler of Parking guidance system 1) Main function: . CCU main function is to inquire about the relevant ZCU data via RS232-NODE by turns and process these data; then send these processed data to PC or other relevant equipments; besides it updates the LED displays data via RS232-NODE. . One CCU can support 60 ZCU in max.. 2.How Parking Guidance System Works: Firstly, UD takes 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 pang dong lai Poland Krakow Airport(1160ots) Singapore Changi Airport 3850lots