CDMA (GPRS)-based wireless data acquisition, transmission, and monitoring solutions
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Application background
With the gradual maturity of CDMA/GPRS network technology, wireless data-related applications have become current hot applications, especially for applications in the power, telecommunications, petroleum, water conservancy, geology, and transportation industries where the location is not fixed. The erection is restricted by various conditions, and the wireless network technology based on CDMA/GPRS has unparalleled advantages.
As a professional embedded application developer and solution provider, Beijing Hengyi provides cost-effective system design for the different needs of industry users, helping users to achieve the best wireless data collection, transmission, and monitoring solutions.
Application occasions
Wireless data collection, transmission and monitoring based on CDMA/GPRS technology can be used in the following applications:
Centralized monitoring, remote meter reading and charging system for electricity, tap water, gas, and oil wells;
Bank wireless card issuance, ATM remote monitoring, POS, etc.;
Real-time information query system for taxation, water conservancy, public safety, public transportation, etc.;
Data network construction of banks, securities, insurance and other institutions;
Remote monitoring and security system;
An Introduction
There are two ways to design a wireless data transmission system:
The first method is “low-end single-chip microcomputer + CDMA/GPRS module”. The advantage of this solution is that the hardware cost is slightly lower, but the functions are relatively limited. It is difficult to develop and support the protocol. At present, most data acquisition terminals use this Kind of programs.
The second method is “high-performance embedded microprocessor + CDMA/GPRS module”. Although this solution has a slightly higher hardware cost and requires a high-performance embedded microprocessor to support the embedded operating system, it can implement a rich protocol interface, which is convenient for transplantation and Upgrading to high-end system applications, while making it easier to achieve data collection and remote monitoring.
With the gradual increase in application requirements, the first method has become less and less able to meet the needs of users, especially as the price of high-performance embedded microprocessors gradually decreases, the price advantage of the first method no longer exists. Therefore, this solution adopts the second implementation method, which can fully meet the complex needs of industry users.
System composition and basic working principle
Figure 1 shows the front-end module composition of the wireless data acquisition, transmission and monitoring system:
Various front-end user equipment is connected to the front-end module through RS232/RS485 interface, Ethernet interface, etc., the front-end module receives user data, and then the data is packaged into IP packets, connected to the CDMA/GPRS network through the CDMA/GPRS module, and then passed through each This kind of gateway and routing sends data to the remote monitoring center. At the same time, the monitoring center can also monitor the remote user equipment through the signal path.
Figure 2 shows the overall composition of the wireless data acquisition and monitoring system:
Through the CDMA/GPRS public data communication network, combined with the front-end modules of the data collection, transmission and monitoring system, it is convenient to build a wireless data collection, transmission and monitoring system based on user-specific applications.
Advantages and technological breakthroughs
Compared with traditional data terminals, the front-end module of this solution uses a high-performance 32-bit embedded microprocessor based on the ARM architecture, combined with a large-capacity memory, and runs an embedded operating system. It can realize a rich protocol interface, which is convenient for use and transplantation. Upgrading to high-end system applications, while making it easier to achieve data collection and remote monitoring.
Software is the core of the application. Relying on the powerful functions of a high-performance embedded microprocessor and embedded operating system, this solution realizes CDMA/GPRS automatic dialing, always-on, with a heartbeat anti-disconnection mechanism, automatic redial when disconnected, and VPN support (Point-to-Point Tunneling Protocol PPTP), configurable NAT, SNMP agent embedded, dynamic domain name resolution, protocol stack support (HTTP, HTML, ICMP, IGMP, TCP, UDP, ARP, SNMP, PPP, IP, FTP, DHCP, DNS, TELNET, etc.), support various application methods such as serial port/wireless, serial port/Ethernet, Ethernet/wireless, and provide Chinese and English web interface and telnet remote management, with network monitoring, SMS alarm, self-diagnosis and indicator alarm And other functions, can fully meet the different application needs of industry customers and high-end application upgrades.
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