Chengdu Ebyte Electronic Technology Co.,Ltd E840-TTL(4G-02)User Manual
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2012
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2019
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Chengdu Ebyte Electronic Technology Co.,Ltd
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Clear the cache: Before the connection to the server is established, the data received by the serial port will be
cached. When the connection with the server is established, you can choose whether to clear the cached data. By default,
the cache is cleared. The maximum size of each Socket in the local cache is 128 bytes, and each Socket buffer is
independent of each other.
2.3 High speed mode
The E840-TTL-(4G-02) 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-02) 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 RF_Setting3.49.exe. After the device is connected to the
network server normally, click “send file” and the sending is completed as shown below.
：
