What are the common problems encountered in DTU connection

With the continuous advancement of the Internet of Things, the application of DTU equipment in industry, environmental protection, energy, sharing and other fields has become more and more extensive. During the application process, what problems DTU often encounters and solutions are analyzed as follows.
First, how does DTU connect with configuration software?
Answer: The advantage of the two connection is that it can communicate without virtual serial port software. The configuration software program does not require major changes on the basis of previous serial communication. It is widely used in remote control, remote virtual serial communication, and remote transparent data transmission. .
When connecting, generally DTU, serial device, and computer. According to the specific model of DTU and configuration software, it is necessary to correctly configure the DTU serial port parameters, as well as the programming connection of the configuration software, and the selection of virtual serial ports.
Second, how does the DTU connect to the relay, and what could be the reason if the connection does not respond?
Answer: Sometimes, the computer, DTU device and relay module are all connected, and then there is no response when sending commands to the relay module.
In this case, it depends on whether your relay matches the DTU serial port you purchased. Most of the DTU serial ports on the market are RS232/485.
Third, why can't 4G DTU connect to VPN?
Answer: Some 4G DTU will have its own routing function, the steps to connect to VPV are. We first create a VPN Server on the server. Open the network connection page on the server (remote server), click "File" -> "New Incoming Connection", and then choose to add an account, please enter the user name, password and other information.
Fourth, how to connect DTU to its own APP?
Answer: You can connect DTU to your own APP through a dedicated cloud platform. Zhongshan IOT also specially developed cloud transparent transmission for its own DTU, which can be realized through simple secondary development, which is convenient and practical.
Fifth, how does DTU connect to the server?
Answer: In this case, the first thing to consider is whether the latest firmware has not been upgraded. After upgrading the latest firmware with a USB connection, power on and restart the server