外文資料翻譯---基于gprs遠程監(jiān)控系統(tǒng)數(shù)據(jù)終端的研究-全文預(yù)覽
【正文】 CU. Serial munication must begin from the bottom GPRS download and eventually achieve data transmission. Serial opened Serial Driver (Open Comm) closed Serial (Close Comm) Reading serial data (Read Comm), wrote to the serial data (Write Comm) interrupt (Interrupt UartRxISR). download GPRS work AT mand set to support GPRS Modem its initialization, initialization can be successful for dialup connections. GPRS and dialup modem initialization process is as follows : AT+IPR=38400。IPCP part of the agreement for the establishment of work protocol environment. and distributed IP addresses. Modem will receive its data input terminal for the allocation of IP address fields. Data terminals to the data center configuration data frame transmission, this IMSI and its dynamic IP address. Data center storage to the information received, as under the downlink data from the contact information. transmissions data After work consultation for data transmission. GPRS work to support IP protocol and IP data packets through, transceiver to transmit data at this time, Terminal System GGSN sent to the PPP IP Packet contains all messages will be transmitted to the Inter Network corresponding IP addresses, thereby pleting terminal transmission of data via the Inter to remote monitoring center in the process. Realization of the difficult process of the System posted GGSN is a difficult process. Gate way GPRS terminal that is recorded (GGSN) and Gateway to LCP, PAP,IPCP agreement in the course of our consultations. Network consultation process is a plex process, the process is as follows. gateway. GPRS dialup access, the first successful return to a PAP REQ frame, LCP REQ we sent an empty frame, the agreement forced to the stage of negotiations, then Gateway GPRS send LCP installed frame, we reject all requests to install and test mode PAP or CHAP certify GPRR Gateway option, we will accept only the PAP, PAP user name or password and then verify the process, if successful, Message Gateway GPRS will return IPCP dynamic allocation of IP addresses. Gateway GPRS time to finish the consultation process . 5 Conclusion Remote monitoring technology in the field of industrial control applications are extensive, in the power system. Network ignite oil investigation, irrigation, transportation and other areas has a very important role, using GPRS wireless technology makes realtime monitoring system reliability has been greatly improved. Intelligent Monitoring System to further promote the industrial and information technology. 。 4003rd mobile terminals for the B category, with GSM and GPRS Inter voice
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