Working Mode - Ebyte E840-TTL-NB03 User Manual

Chengdu Ebyte Electronic Technology Co., Ltd. E840-TTL-NB03 User Manual
2.2.1 Working mode：
1. Working mode：Transparent transmission mode, AT configuration mode, cloud platform mode
a) Transparent transmission mode: After power-on, the module 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 the number 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 486 bytes.
This module supports one-way Socket connection. The user can be configured as TCP Client or UDP Client. In
transparent transmission mode, the received serial port data will be directly transmitted to the network server, and the
received network server data will be directly output through the serial port.
b) AT mode: In this mode, the serial port data is regarded as an AT command.
c) Cloud platform mode: The E840-DTU (NB-03) configuration tool can be used to switch to the cloud platform mode.
After the configuration is completed, the data can be tested. It should be noted that the maximum data of the single
package in the cloud platform working mode is 100. , the time interval for sending data packets is not less than 5s.
d) Mode switching. After the serial port receives the "+++" frame data in the transparent transmission mode, the RX pin
receives any AT command within 3 seconds, and the mode switches to the AT mode. In AT mode, send
AT+EXAT<CR><LF> to switch to transparent transmission mode.
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 65535 seconds. When set to 0, the
short connection function is disabled.
b) Registration packet: The registration packet is closed by default. The total of 4 options are: send 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, customize The maximum length of the 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
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