| Water pollution is one of the concerned issues in contemporary world. Water quality online-monitoring system(WQOMS) is an embedded real-time system. It is a practical combination of traditional monitoring and wireless transmitting. It is much different from the architecture of traditional monitoring system, but integrates the GPRS modules into embedded device and takes advantage of online all the time data transport function provided by existing GPRS technology, the characteristic of counting fees by flux, and well suited combination of online monitoring, embedded devices and wireless communication.The hardware of WQOMS consists of Digital Camera, E-Box based on WinCE X86-System, detecting instrument, GPRS Network Adapter and PC server. In the monitoring terminal, detecting instrument and Digital Camera connect to E-box via USB port, while GPRS modem connects via serial port. PC server is the control center. The main function in this system includes gathering data of water quality near the waterspout, and sending data to control center via GPRS module. After analysis the data, the control center would give alarm, and meanwhile send a command to E-Box to take picture.This issue mainly introduces the customization of Windows CE operating system, the design of serial transmitting module and transmitting protocol stacks. The protocol stacks designs for making the data transmit smoothly, and bases on the data GPRS sends. For data, picture and command, each kind of these three types packet has the different length. |
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