Chengdu Ebyte Electronic Technology Co.,Ltd
E840-TTL-4G02E User Manual
Copyright ©2012–2019，
Chengdu Ebyte Electronic Technology Co.,Ltd
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2. Network function
a) Short connection: In TCP Client mode, the short connection function is enabled. If there is no data reception in the serial port
or network port within the set time, the network connection will be automatically disconnected. The short connection function is
turned off by default. The connection time can be set from 2 to 255 seconds. When set to 0, the short connection function is disabled.
b) Registration package: The registration package is closed by default. The user can configure 4 types of registration packages.
You can choose to send the physical address (IMEI code) when connecting, send custom data when connecting, add the physics before
the connection and each packet of data. Custom data is added to the address, connection time, and data before each packet. The
maximum length of the custom registration packet is 40 bytes (when set to HEX format, the maximum length is 20 bytes).
c) Heartbeat packet: In the idle state of network communication, the heartbeat packet is used for network state maintenance. The
heartbeat period can be set from 0 to 65535 seconds, and the maximum length of the heartbeat packet is 40 bytes (when set to HEX
format, the maximum length is 20 bytes). Supports two heartbeat types: network heartbeat and serial heartbeat. When the network
heartbeat is selected, the communication idle time starts, and the heartbeat data packet is sent to the server according to the configured
heartbeat period. Select the serial port heartbeat, start timing
with communication idle, and send heartbeat packets to the serial port
according to the configured heartbeat period.
d)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 10 bytes, and each Socket buffer is independent of each other.
3. High speed mode
The E840-TTL-4G02E 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 460800 serial port baud rate and below.
The E840-TTL-4G02E 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:
Содержание E840-TTL-4G02E
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