Quectel BC66 - Appendix References; Related Documents; Terms and Abbreviations

NB-IoT Module Series
BC66 Hardware Design
BC66_Hardware_Design 29 / 59
TXD
RXD
TXD
RXD
Module (DCE)
Serial portMain port
GND GND
DTE
Figure 15: Reference Design for Main UART Port
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.
DTE
TXD
RXD
GND
Module
TXD_DBG
RXD_DBG
GND
Figure 16: 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.