Aux Description; Indication Of Serial Output; Indication Of Wireless Transmission; Module In Configuration Process - Semtech E28-2G4T27SX User Manual

5.4. AUX Description


AUX Pin can be used as indication for wireless send & receive buffer and self-check. It can indicate whether there is data
that is yet to send via wireless or whether all wireless data has been sent through UART, or whether the module is still in the
process of self-check initialization.

5.6.1 Indication of serial output


Used to wake up the external MCU (note: AUX indicates no delay under continuous mode)

5.6.2 Indication of wireless transmission


Under sub-packet transmission mode, the internal buffer size is determined by the sub-packet size, if the packet length is 221
bytes, then the buffer size will be 2048 bytes, when AUX=1, user could continuously initiate transmitting of no more than
2048 bytes.

Under continuous transmission mode, AUX=1 means the module is busy, but it is not applicable for waking up external
MCU, because the data transmission is very quick under continuous transmission mode.

AUX=1 means all serial data is transmitted through RF, and the module is at idle state.

5.6.3 Module in configuration process


Only occurs when resetting or when exiting sleep mode
Mode（0-3） M2
0 - Transmission Mode 1
.
M1 M0
Serial port on, RF on, continuous
0 0
transparent transmission
Introduction
E28-2G4T27SX User Manual
Remarks
The air data rate can be manually configured and
automatically adjusted along with baud rate values ；
the baud rates on both sides must be the same under
continuous transmission mode
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