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Chengdu Ebyte Electronic Technology Co., Ltd
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.
receivi
Numerical calculation method: signal strength =-(256 (decimal)-data (decimal)) dBm
ng
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（Mode2）
Type
When M0 = 0，M1 = 1, module working in module1
No wireless transmission is allowed, the received serial data will be discarded.
transmission
receiving
Unable to receive wireless data
Can be used for module parameter setting, use serial port 9600, 8N1, set module working
configuration
parameters according to specific instruction format
When entering from the setting mode to other modes, the module will reconfigure the
parameters. During the 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.
6.5 Sleep Mode（Mode3）
Type
When M0 = 1，M1 = 1，module working in module3
transmi
Unable to transmit wireless data
ssion
receivi
Unable to receive wireless data
ng
When the module is in the ultra-low power state, all other functions of are turned off, and the sleep
others
mode can only be exited through the state switch of M1M0.
6.6 Fast communication test
Step
Connect E49-900T20S module to the E49-TBL test board, and then plug into the USB test board (E15-USB-T2),
plug into the computer to ensure that the driver has been installed correctly;
1
Plug in the mode selection jumper cap on the USB test board ( M1 = 0, M0 = 0),
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
Specific operation
E49-900T20S User Manual
13
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