Ebyte E840-DTU User Manual page 13

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the cache is cleared. The maximum size of each Socket in the local cache 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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E840-DTU(4G-02E) User Manual
10 bytes, and each Socket buffer is
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