The on-site monitoring point of 51202329-606 is automatically controlled by PLC and relevant information is collected, which is connected to GSM DTU terminal through RS232 or RS485 interface, and the equipment information collected by PLC is processed and protocol encapsulated by GSM DTU terminal and sent to GSM wireless network.

The monitoring centre of 51202329-606 adopts the public network access scheme Server adopts the public network way to access the Internet, such as ADSL dial-up/telecommunication dedicated broadband Internet access, etc., and applies for fixed IP address of the public network; small and medium-capacity system applications can be realized. The server adopts the DDN line provided by the provincial mobile communication company, applies for the configuration of fixed IP address, and connects with the GSM SMS remote control module. As the DDN line can provide higher bandwidth, when the number of PLCs on site increases, the centre can meet the demand without capacity expansion, and it can realize high-capacity system application.

The server of 51202329-606 accepts the data coming from GSM SMS remote control module and then carries out AAA authentication first, and then transmits it to the mainframe of the computer in the monitoring centre, and then restores the data display and carries out the data processing through the system software, so as to further enhance the security performance of the system data communication.