With the development of GPRS technology in the field of wireless communications, GPRS modem has become more and more widely used as a PC terminal for GPRS on the Internet. Correspondingly, the use of GPRS modem in single-chip computer systems to achieve Internet access has begun to attract people’s attention. GPRS has the advantages of always being online, fast login and billing based on traffic. If only low-speed data is transmitted wirelessly, the cost of using a higher-cost PC to control it will be too high. At present, most of them use GPRS modules without built-in TCP/IP protocol, which requires additional TCP/IP protocol to be added to the system. The general approach is to write it yourself, or use the operating system and then add the protocol.
The gprss module-ZHC2931 developed by Zongheng Intelligent Control is a module that supports 2 channels of dry (wet) node detection, 1 channel of relay (COM, NO, NC) output, 1 channel of analog quantity (current 4~20mA) detection , and 1 channel of analog quantity (current 4~20mA) detection. Network IO products with serial port transparent transmission are compatible with ModbusRTU/TCP protocol. With “remote control” as the core function and high ease of use, users can easily and quickly integrate it into their own systems to achieve remote control based on GPRS network.
gprs module function
Support 1 relay output
◆ Support 2 DI (dry/wet node) inputs
◆ Support 1 analog (current) input
◆ Supports 8 conditional control instructions, making control more convenient
◆ Provide 1 serial port (RS485/RS232)
◆Support serial heartbeat package
◆ Supports multiple function codes: 01, 02, 03, 04, 05, 06, 0F, 10
◆ Support setting the direction of active data reporting
◆ Support TCP_Client, HTTP_Client
◆ Supports two working modes: host mode and slave mode. The host mode supports cascading multiple Modbus devices
◆ Compatible with Modbus RTU/TCP
◆ Support cloud forwarding and cloud networking
◆ Support local upgrade and remote upgrade
◆ Support hardware watchdog
◆Multiple indicator lights show working status
◆ Support domain name address resolution
◆ Support setting APN
◆ Support signal query
◆Support SIM card number query
◆ Support heartbeat package
◆ Support registration packages in any format to ensure the legality and uniqueness of device identity
◆ Provide one switching output
◆ The relay adopts photoelectric isolation
◆ The relay retains the long-open and long-closed state
◆Support timing flip of relay status
◆ Support setting relay start status
gprs module application
The application of gprs module in time-based billing. This article focuses on the GPRS time-based billing module of a certain communication operator. It analyzes the processing bottlenecks and ordering relationship data inconsistencies in this module. Based on the GPRS bill processing process in the existing billing system, Added GPRS duration billing bill processing module. This module obtains the ordering data in BOSS by reading the memory database, and corrects abnormal and cross billing according to different scenarios. By comparing the system performance before and after optimization, the data shows that the module processing performance has been significantly improved after optimization, ensuring data consistency between modules and better supporting business development needs.
At present, there are three main charging modes for GPRS services: charging based on traffic volume, charging based on duration, and charging based on content. Billed by traffic, that is, based on the amount of data generated when the user accesses the Internet
Billing is based on the sum of upstream and downstream traffic. Billing is based on duration, that is, billing is based on the user’s online time. The services launched are mainly monthly, half-year, and annual mobile phone and Internet card package services . The core of content-based billing is to differentiate traffic according to services, and the rules for differentiation are content-based billing rules.
There are many GPRS modules on the market to choose from, some of which are suitable for industrial and vehicle-mounted high-reliability occasions, and of course the price is higher; but in general industrial and vehicle-mounted applications, if users are more cost-sensitive, they can choose Simcom. SIM100. It makes a good compromise between functional performance and price, especially the built-in TCP/IP protocol, which reduces the workload of the software part; it is very suitable for simple applications that do not require an operating system, and can effectively reduce costs. , shorten the research and development cycle.
Keywords: gprs module