Uart Interface - Quectel UC20 Hardware Design

3.10. UART Interface

The module provides two UART interfaces: main UART interface and debug UART interface. The
following shows the different features.

Main UART interface supports 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bps
baud rate, the default is 115200bps. This interface can be used for data transmission, AT
communication or firmware upgrade.

Debug UART interface supports 115200bps. It can be used for GNSS NMEA sentences output.
NOTE
USB interface supports software debug and firmware upgrade by default.
The module is designed as the DCE (Data Communication Equipment), following the traditional
DCE-DTE (Data Terminal Equipment) connection. The following tables show the pin definition of these
two UART interfaces.
Table 9: Pin Definition of the Main UART Interface
Pin Name
RI
DCD
CTS
UC20_Hardware_Design
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Large
Capacitance
Capacitor
Figure 18: RTC Supply from Capacitor
Pin No. I/O
62 DO
63 DO
64 DO
VRTC
Description
Ring indicator.
Data carrier detection.
Clear to send.
Confidential / Released
UMTS/HSPA Module Series
UC20 Hardware Design
R
RTC
Core
Module
Comment
1.8V power domain.
1.8V power domain.
1.8V power domain.
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