Chengdu Ebyte Electronic Technology Co,;Ltd
E90-DTU (900SL22-GPRS) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd
19
4 Note
PC click "to enter configuration mode", the system in the configuration state, press the Reload button 4 ~
10 s, products will be back to factory Settings, and automatically switch to a communication status,
"choice mode", the switch at this time the upper machine message box will pop up "parameter error \ r \ n
try click enter configuration status button" message, at this time to enter the configuration state, the
"public order and prompt" click on the upper machine box "to enter configuration mode" button, if you
want to keep communication, do not click the "enter configuration mode" button.
If the upper computer prompts wrong parameters or the module fails to respond, please try to solve the
problem by pressing the Reset button, re-entering the configuration state, checking whether the USB
connection is correct, and checking whether the module is powered on normally.
Enter the configuration state, check whether the USB connection is correct, check whether the module is
powered on normally.
The status bar of the upper computer device shows "no valid device found". Check whether the USB
cable and power cord are connected correctly. If they are connected, try to press the Reset button, re-plug
the power cord or re-plug the USB.
Server A of this product is always open. After successful initialization, it will automatically establish
connection with the configured network server.
After the product is powered on, it has been unable to be successfully initialized, that is, the State
indicator light of more than 30 seconds has no indication. At this time, it should check whether the
module installation is normal, whether the SIM card is inserted normally and whether the SIM card has
been invalid.
Heartbeat function is used to maintain the connection after the successful establishment of connection
between the product and the server. In the network, if the client and the network server successfully
establish a connection and there is no data transmission for a long time, the Socket link may appear
"dead", that is, the link exists, but the data cannot be sent or received. Therefore, in practical use, it is
recommended to enable heartbeat packet function to ensure the reliability of network links.
In practice, it is normal that there are differences in data delay between two communications.
Version
Date
Revision note
By.
1.00
2019/04/25
Original version
Lizhibing
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