Wireless hydrological data collection system solution

◇ Hydrological information collection point
The INDTU-051G/10 GPRS DTU of Yibang Technology Co., Ltd. is used to connect to the hydrological equipment collection point through RS232/RS485/TTL, and access the dedicated GPRS APN network provided by the mobile company for the Hydrological Bureau. The network has no restrictions on the access location, time, and number of hydrological information collection points, and can be increased or decreased at any time. It can meet the needs of mountainous areas, remote areas, and cross-regional access.

◇ Hydrological center station
The network proxy server in this system can be connected to the INTERNET public network such as ADSL and LAN, and adopts a fixed public network IP. After the GPRS data transmission terminal is powered on, it will actively access the network proxy server according to the IP address pre-set inside it, and establish a TCP/IP link with the monitoring center through the proxy server. The main station of the monitoring center itself maintains the IP address and ID number of each terminal connected. When the main station wants to make a data request to a certain monitoring terminal, it will find the corresponding terminal according to the IP address and ID number, and send the command to the terminal. After the terminal responds, it sends the data to the network proxy server port through the GRPS data transmission terminal, and forwards it to the monitoring center main station through port mapping, which completes a responsive communication process. When the number of hydrological information collection points increases, the center can meet the demand without expansion.
◇ GSM/GPRS mobile data transmission network
The data collected by the on-site monitoring point is decoded and processed by the GSM/GPRS network air interface function module at the same time, converted into the format for public network data transmission, and transmitted through China Mobile's GPRS wireless data network, and finally transmitted to the monitoring center IP address.