Module Function; Operating Mode; Transparent Transmission Mode; 4-Channel Socket Connections - Ebyte E840-TTL-4G02E User Manual

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communication test result is as shown below:

4 Module function

After power-on, the radio works in the transparent transmission mode by default, and automatically starts the

network connection. When the connection is established with the server, any data received by the serial port will be

transparently transmitted to the server. At the same time, it can also receive data from the server. After receiving the

server data, the module will output directly through the serial port. The maximum length of data supported by this

module is 10 bytes. When multiple links are connected to the server at the same time, the data packet will be sent to the

four links at the same time. When there are data to be sent from any network link, the radio will transparently output the

data.

This module supports 4-channel Socket connections. For each socket users can configured it as TCP Client or UDP

Client. When sending data, users can use protocol transmission or transparent transmission.The maximum length of

data supported by this module is 1024 bytes.

Protocol transmission format (please open the protocol transmission mode, refer to "E840-TTL-4G02E-AT

instruction set" for details)

Send：0x55 0xFE 0xAA ID data

For example： 55 FE AA 00 AA BB CC

to transmit

Receive：0xAA 0XFE 0x55 ID data length Data

For example：AA FE 55 00 00 03 11 22 33

//00： SOCK0 link， AA BB CC： the data that the user actually needs

//00: SOCK0 link， 00 03：the valid data length received this time

E840-TTL-4G02E User Manual

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