Research And Design Of The GPRS Wireless Data Transmission Terminal

With the development of power system automation, the integration between motor and communication is increasing,the way of data monitor is also changing. The monitor target and monitor terminal of traditional motor monitor mode are fixed ,no one can free move. For lonely and remote place, monitor can't be realized easily, so traditional monitor mode has been unable to meet the needs of the development of power system automation. GPRS is based on Packet-switch, it only occupies wireless resource when there have data transfer and receive. Wireless data transmission system based on GPRS can realize long-distance data transmission, and this mode is very easy and flexible for combining network. With the popularity of Internet technology and development of GPRS communications technology, GPRS network communication with lower price and always-on performance has immeasurable developable foreground. Wireless data transmission also has widely application in the future.In this paper, the characteristic and application of GPRS technology and transport protocol of GPRS were introuduced at first, then a method of wireless data transmission based on GPRS was proposed. The system mainly realized GPRS data transmission connecting to Internet by GPRS and data exchange between data terminal and monitor center. In the firmware solution, A Rabbit2000 MCU with embedded TCP/IP software was selected as the control module, SIM100 was used as the wireless module. The Rabbit2000 MCU, which is designed by the American Z-World company, is specially designed for Internet embedded system. It's a good solution to the storage space, operating speed, network communication and program development issues.The hardware and software design for this system were introduced in this paper. The hardware design was composed of a memory extension of control unit, a interface circuit with wireless module and periphery circuit. Software design which was programmed by Dynamic C language, was composed of PPP protocol and data transmission. On the basis of realizing data transmission, The UDP and TCP mode were compared, and then appropriate remote motor monitor was selected.