At Mode; Mode Switch; Network Function; Ebyte Iot Platform Function - Ebyte E840-DTU User Manual

Gprs serial server

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User manual (33 pages)

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Table Of Contents

Table of Contents

GPRS

3.2 AT mode

In this mode, the serial port data is regarded as an AT command. The user can configure the module through a valid AT command. If the format is wrong, the

relevant error code will be prompted.。

3.3 Mode switch

In the transparent transmission mode, after the serial port receives the "+++" frame data, the RX pin receives any AT command within 3 seconds, and the

mode switches to the AT mode. In AT mode, one can send AT+EXAT<CR><LF> to switch to transparent transmission mode.。

4. Network function

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.

Registration package: The registration package is closed by default. 4 options include: physical address when connecting, send custom data when

connecting, add physical address before each packet of data, add custom data before each packet of data.

registration package is 40 bytes (when set to HEX format, the maximum length is 20 bytes)

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 types of heartbeats, network heartbeat, serial heartbeat. User selects network heartbeat, starts timing when in communication idle,

and sends heartbeat packets to the server according to the configured heartbeat period. User selects the serial port heartbeat, start timing when in

communication idle, and send heartbeat packets to the serial port according to the configured heartbeat period.

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 packet length of the local cache is 256 bytes.

5. Ebyte IoT platform function

AT+EBTIOT command is used to set whether the module enables the transparent transmission function of the Ebyte cloud platform, after the device is

turned on, the information such as the heartbeat and registration package configured by the user will be invalid. The user only needs to set the forwarding

relationship of the corresponding device to the platform to implement the transparent transmission. For details of the related operations, please refer to the

"Transparent Transmission Guide for Ebyte Cloud Platform ".