Main Uart Interface; Debug Uart Interface - Quectel BC65 Hardware Design

3.8.1. Main UART Interface

The main UART interface can be used for AT command communication and data transmission, and in
such case, the baud rates should be 4800 bps, 9600 bps (default) and 57600 bps. The main UART
interface is available in active mode and idle mode.
The figure below shows the connection between DCE and DTE.
Module (DCE)

3.8.2. Debug UART Interface

Through debug tools, the debug UART interface can be used to output logs for firmware debugging and
upgrading. The baud rate is 921600 bps by default. The following figure is a reference design for debug
UART interface.
Module
BC65_Hardware_Design
Main port
MAIN_TXD
MAIN_RXD
GND
Figure 14: Reference Design for Main UART Interface
DBG_TXD
DBG_RXD
GND
Figure 15: Reference Design for Debug UART Interface
NB-IoT Module Series
BC65 Hardware Design
DTE
Serial port
TXD
RXD
GND
DTE
TXD
RXD
GND
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