Transmission Mode （Mode 0; Rssi Mode （Mode 1; Setting Mode （Mode 2 - Ebyte E49-400T20D User Manual

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6.2 Transmission mode（Mode 0）
Type M0 = 0，M1 = 0
The module receives user data from the serial port, the maximum length of the wireless data packet transmitted
by the module is 54 bytes, when the amount of user input data reaches 54 bytes, the module will start wireless
transmission. At this time, the user can continue to enter the data that needs to be transmitted.
When the user needs to transmit less than 54 bytes, the module waits for about 20ms. If there is no user data to
continue to input, the data is considered to be terminated. At this time, the module sends all data via wireless.
Transm
itting
When the module receives the first user data, AUX outputs low level. When the module puts all data into the RF
chip and starts transmitting, AUX outputs high level.
At this point, it indicates that the last packet of wireless data has been transmitted, and the user can continue to
enter data.
Data packets sent through mode 0 can only be received by the receiving module in mode 0.
The module is on the wireless receiving function all the time and can receive data packets from mode 0.
After receiving the data packet and the module AUX outputs a low level, it starts sending wireless data through
Receivi
ng
the serial port TXD pin. After all wireless data is output through the serial port, the module outputs AUX high
level.
6.3 RSSI Mode（Mode 1）
Type M0 = 1，M1 = 0
Transmitti
No wireless transmission is allowed, the received serial data will be discarded.
ng
Can not receive air wireless data, only scan the signal strength of the current channel, and output a strength value
(relative value) through the serial port every 100ms.
Receiving Numerical calculation method: signal strength =-(256 (decimal)-data (decimal)) dBm
If the hexadecimal value output by the serial port is 0x91, the actual signal strength is:-(256 (decimal)-145
(decimal)) =-111dBm
6.4 Setting Mode（Mode 2）
Type M0 = 0，M1 = 1
transmit
No wireless transmission is allowed, the received serial data will be discarded.
ting
receivin
Unable to receive wireless data
g
configur Can be used for module parameter setting, use serial port 9600, 8N1, set module working parameters according
ation to specific instruction format
When entering from the setting mode to other modes, the module will reconfigure the parameters. During the
Note configuration, AUX remains low level;
It outputs a high level after finished, so it is recommended that the user detect the rising edge of AUX.
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E49-400T20D User Manual
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