Chengdu Ebyte Electronic Technology Co., Ltd
E49-900T20S User Manual
Copyright ©2012–2021
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Chengdu Ebyte Electronic Technology Co.,Ltd.
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5. Function description
5.1 Module reset
After the module is powered on, AUX will immediately output a low level and perform a hardware self-test and set
the operating mode according to user parameters. In this process, AUX is kept at a low level, outputs a high level after
completion, and starts to work normally according to the working mode composed of M1 and M0. Therefore, users need
to wait for the rising edge of AUX as the starting point for the normal operation of the module.
5.2 AUX detailed explanation
AUX is used for wireless sending and receiving buffer indication and self-inspection indication.
It indicates whether the data of the module that has not been transmitted through the wireless, or whether it has
received wireless data that has not been transmitted through the serial port, or the module is in the process of initial
self-test.
5.2.1 Wireless receiving indication
After receiving the valid wireless data, the module will immediately pull AUX low and start the serial port to output
data and then pull up AUX after the data output is completed.
5.2.2 Wireless transmission indication
After receiving the serial port data, the module will immediately pull down AUX and start sending data wirelessly
and after all the data is sent, pull up AUX.
