First, washi intelligent photovoltaic power station automation terminal HS-6210/DTU work process description:
After GPRS/DTU is powered on, the working parameters saved in the internal FLASH are first read out (including GPRS dial parameters, serial port baud rate, data center IP address, etc., which have been configured)
Washi Smart GPRS/DTU logs on to the GSM network and then dials GPRS PPP. Upon successful dialing, the GPRS/DTU will receive an internal IP address randomly assigned by the mobile (typically 10. X.X.X)。 That is, GPRS/DTU is in the mobile intranet, and its intranet IP address is usually not fixed, changing with each dial. We can understand that GPRS/DTU is a mobile device in the internal LAN at this time, through the mobile gateway to achieve communication with the external Internet public network. This is similar to how computers within a local area network access the external network through a gateway
Watsch Smart GPRS/DTU proactively initiates a communication connection with the data center and keeps the communication connection in place. Because GPRS/DTU is on the mobile intranet, and the IP address is not fixed. Therefore, only GPRS/DTU can be actively connected to the data center, and not by the data center. This requires the data center to have a fixed public IP address or a fixed domain name
The public IP address or fixed domain name of the data center is stored as a parameter in the GPRS/DTU so that once the GPRS/DTU is successfully dialed, it can actively connect to the data center
Washi Intelligent GPRS/DTU initiates TCP or UDP communication requests to the data center through the IP address of the data center (if the central domain name is used, first resolve the central IP address) and the port number. After receiving the response from the center, the GPRS/DTU considers the handshake with the center to be successful, and then keeps this communication connection alive. If the communication connection is interrupted, the Wase Smart GPRS/DTU will immediately shake hands with the center again
Since the TCP/UDP communication connection is already established, data two-way communication is possible. For DTUs, it is necessary to establish two-way communication with the data center to complete the conversion of the user serial port data and the GPRS network packet. Once the user's serial port data is received, DTU immediately encapsulates the serial port data in a TCP/UDP packet and sends it to the data center; conversely, when the DTUs receives the TCP/UDP packet sent from the data center, the data content is taken out of it and immediately sent to the user device through the serial port. Through a wired data acquisition center, there is simultaneous two-way communication with many GPRS/DTUs
Second, the characteristics of Washi Intelligent HS-6210/DTU:
1. According to the set working parameters, no need for any other equipment, power-on automatic dial-up Internet access, automatic connection to the server
2. Washi Intelligent HS-6210/DTU fully transparent data transceiver mode
3. Users can set the heartbeat interval to keep the device online for a long time
4. Multiple monitoring centers, main centers and backup centers can be switched at will, and each data center can be configured to work with fixed IP or domain name resolution
5. Graphical interface, AT command line, remote and other ways to configure and control the parameters of DTU.
6. Washi Intelligent HS-6210/DTU is small in size and is particularly suitable for embedded system integration
7. Push-pull or drawer SIM card holder for reliable connection
8. Highly integrated GPRS, TCP/IP technology, built-in industrial-grade GPRS engine and embedded CPU to complete complex network protocols, support PPP, TCP, UDP, DNS and other protocols, providing transparent transmission channels for user data
9. Washi Intelligent HS-6210/DTU dual-core design, when the main core is affected by super electromagnetic interference and other unexpected situations such as crash phenomenon, the core is immediately started, forcing the main core to power off and restart. The dual-core, soft and hard watchdog design ensures that the module never crashes in a variety of complex environments, without any manual intervention, saving maintenance costs
10. Due to the disconnection caused by poor signal, center closure, etc., Washi Intelligent HS-6210/DTU can ensure automatic reconnection after the conditions are restored
11. Support Center is fixed IP mode
12. The Support Center is a dynamic IP+ domain name resolution method, which enables users to apply for fixed IP services without applying for fixed IP services
13. Support point-to-point and point-to-multipoint networking
14. Washi Intelligent HS-6210/DTU provides TTL, 232, 485 and other communication interfaces, baud rate optional, from 600BPS to 115200BPS
15. Serial Port Programming (ISP) is implemented through the on-chip bootloader loader for easy upgrade. Enjoy new features at any time
16. Embedded FLASH memory, once set, permanently valid, power failure is not lost
17. Support soft shutdown, soft reset and other functions, saving power consumption and data traffic
18. Washi Intelligent HS-6210/DTU supports APN data private network service