CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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data line.
The USB interface of the module does not provide USB bus power to the outside, and the
module can only be used as a slave device.
The functions supported by the USB interface are: software download and upgrade, data
communication, AT Command and other functions.
3.6 UART interface
The CLM920_RC3 module provides two sets of UART interfaces. Main serial port and
debug serial port, the serial port level is 1.8V.
3.6.1 Main UART
Main UART port:
The UART port can realize AT interactive commands, print program log information, and
interact with peripheral data.The baud rate of the module's main UART port can be set to
9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600bps baud rate, etc. The default
is 115200bps.
The main UART interface is defined as follows
：
Table 3-13 Definition of main UART port signals
Pin
Signal name
I/O
Description
62
RI
DO
Module output ringing output
63
DCD
DO
Module output carrier detection
64
CTS
DO
Module clear send
65
RTS
DI
DTE request to send data
66
DTR
DI
DTE is ready
67
TXD
DO
Module sends data
68
RXD
DI
Module receives data
When users want to use the full-function UART port, they can refer to the following
connection methods:
