EVB User Guide
M80_EVB_UGD_V1.0
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5.4.
Turn off
Press the PWRKEY button for about 2 seconds, the module will be turned off.
5.5.
Emergency off
Press the EMERG_OFF button for more than 0.2 second, the module will be shut down
immediately. After that, the module can be restarted by pressing the PWRKEY button. Please note
that this operation is harmful to the whole module system and should only be done in emergency
such as failing to turn off the module through the PWRKEY button.
5.6.
Auxiliary UART
Quectel module provides two UART ports for achieving Dual UART.
AT+QEAUART=1
which is sent via main UART is used to enable auxiliary UART. Please restart
the module after executing the command. For more details, please refer to
document [5].
Auxiliary UART only includes TX data (TXD), RX data (RXD). For the connection of auxiliary
UART, please refer to
Figure22.
Host(DTE)
controller
TXD
RXD
GND
Module(DCE)
TXD_AUX
RXD_AUX
GND
Figure 22: Connection of auxiliary UART
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