Debug Uart Port; Auxiliary Uart Port - Quectel BC66 Hardware Design

3.9.2. Debug UART Port

Through debug tools, the debug UART port can be used to output logs for firmware debugging. Its baud
rate is 115200bps by default. The following is a reference design of debug UART port.

3.9.3. Auxiliary UART Port

The auxiliary UART port is designed as a general purpose UART for communication with DTE. It also
supports log output for firmware debugging, and hardware flow control*. Its baud rate is 115200bps by
default. The following is a reference design of auxiliary UART port.
BC66_Hardware_Design
Module (DCE)
Main port
TXD
RXD
GND
Figure 15: Reference Design for Main UART Port
Module
TXD_DBG
RXD_DBG
GND
Figure 16: Reference Design of Debug UART Port
NB-IoT Module Series
BC66 Hardware Design
DTE
Serial port
TXD
RXD
GND
DTE
TXD
RXD
GND
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