Specifications

M80 Hardware Design
M80_HD_V1.0 - 49 -
3.9.2. Debug Port
Debug Port
 Two lines: DBG_TXD and DBG_RXD
 It outputs log information automatically.
 Debug Port is only used for software debugging and its baud rate must be configured as
460800bps.
Debug Computer
TXD
RXD
GND
Module(DCE)
Debug port
DBG_TXD
DBG_RXD
GND
Figure 22: Connection of software debug
3.9.3. Auxiliary UART Port
Auxiliary UART Port
 Two data lines: TXD_AUX and RXD_AUX
 Auxiliary UART port is used for AT command only and doesn’t support GPRS data, CSD
FAX, Multiplexing function etc.
 Support the communication baud rates as the following:
4800, 9600, 14400, 19200,28800,38400,57600,115200.
 The default baud rate setting is 115200bps, and doesn’t support autobauding. The baud rate
can be modified by AT+QSEDCB command. For more details, please refer to document [1].
Host(DTE)
controller
TXD
RXD
GND
Module(DCE)
TXD_AUX
RXD_AUX
GND
Figure 23: Connection of Auxiliary UART port
Quectel
Confidential