Debug Uart Port; Auxiliary Uart Port - Quectel NB-IoT Module Series Hardware Design

3.8.2. Debug UART Port

Through log viewer tools, customers can check the log information via debug UART port for firmware
debugging. A reference design for the debug UART port is shown below.

3.8.3. Auxiliary UART Port

The auxiliary UART port is used for AT command communication and data transmission. A reference
design for the auxiliary UART port is shown below.
BC66_Hardware_Design
Module (DCE)
Main port
TXD
RXD
GND
Figure 12: Reference Design for Main UART Port
Module
TXD_DBG
RXD_DBG
GND
Figure 13: Reference Design for Debug UART Port
NB-IoT Module Series
BC66 Hardware Design
DTE
Serial port
TXD
RXD
GND
DTE
TXD
RXD
GND
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