Chengdu Ebyte Electronic Technology Co.,Ltd E840-DTU(4G-02E) User Manual
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Chengdu Ebyte Electronic Technology Co.,Ltd
the cache is cleared. The maximum size of each Socket in the local cache is 10 bytes, and each Socket buffer is
independent of each other.
3、 High speed mode
The E840-DTU(4G-02E) is designed with a separate high-speed mode. In this mode, both the network and the
device can transmit any packet length data, such as file, picture, and video.
Configure/query the high-speed mode state through the AT+HSPEED command. After the high-speed mode is
enabled, the device can transmit any packet length data at 230400 serial port baud rate and below.
The E840-TTL-(4G-02E) file transfer process will be demonstrated below:
1). Turn on the device high-speed mode: After the device enters the AT mode, send AT+HSPEED=ON to enable
the high-speed mode, configure the connected server address, and restart the device.
2). Ready to transfer the file. The file transferred in this demo is RF_Setting3.49.exe. The file is an executable file.
After startup, the following interface is displayed:
3). Open the serial port tool and use the file sending method to open E840_Setting_V2.43.exe. After the device is
connected to the network server normally, click “send file” and the sending is completed as shown below.：
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