Wireless UART Module User Manual of E64 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd.
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5.
Function Description
5.1 Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the operating mode on the basis
of the user parameters. During the process, the AUX keeps low level. After the process completed, the AUX outputs high level and starts
to work as per the operating mode combined by M1 and M0. Therefore, the user needs to wait the AUX rising edge as the starting point
of module’s normal work.
5.2 AUX Description
l
AUX Pin can be used as indication for module’s statue and self-checking.
l
It can indicate whether the module is in transmission now. There are 3 different effective situations for AUX and they are self-check
of module, interaction between module and targeted devices and data to transmit of the module.
5.2.1 Indication of UART Output
To wake up external MCU:
5.2.2 Indication of Wireless Transmitting
There are three phases for wireless transmitting, and they are UART-data-receiving、handshake and return the result.
When RXD receives serial data, AUX output low level at once. If data frame is compliant with E64’s protocol when RXD ends, AUX remains
low level and the module (master or slave) starts to handshake with target module (slave or master)
When AUX=1, the module will return the result of the transmission，no matter succeeded or failed.
After the slaves start a transaction, the time of the transaction will take is showed as below. AUX remains low level during this time
Air data rate
2Kbps
5Kbps
8Kbps
20Kbps
Normal communication time
About 3s
About 2s
About 1s
About 1s
