Debug Port; Auxiliary Uart Port - Quectel M50 Hardware Design

M50 Hardware Design

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 firmware debugging and its baud rate must be configured as
460800bps.
Module (DCE)
Debug port
DBG_TXD
DBG_RXD

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 does not support GPRS data, CSD
FAX, Multiplexing function etc.

Auxiliary UART port supports the communication baud rates as the following:
4800, 9600, 14400, 19200, 28800, 38400, 57600, 115200.

The default baud rate setting is 115200bps, and does not support autobauding. The baud rate
can be modified by AT+QSEDCB command. For more details, please refer to the document
[1].
M50_HD_V2.0
GND
Figure 22 : Reference design for Debug Port
Computer
TXD
RXD
GND
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