CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD
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3.6 UART interface
3.6.1 Main serial port
The CLM920 NC3 module provides two sets of UART interfaces. The main serial port
and the debug serial port have a serial port level of 1.8V.
Main serial port:
The serial port can realize AT interactive instructions, print program log information, and
interact with peripheral data.
The module's serial port baud rate can be set to 4800, 9600, 19200, 38400, 57600,
115200, 230400, 460800, 921600bps baud rate, the default is 115200bps.
The UART interface is defined as follows
：
Table 3-10 UART serial port signal definition
Pin Signal name I/O Description
Para
meter
Level value (V)
Remarks
Min Typical
Max
62
UART_RI
DO
UART ringing
output
VOH 1.35 1.8
2
VOL
0
0.45
63
UART_DCD DO
UART data
carrier detection
VOH 1.35 1.8
2
VOL
0
0.45
64
UART_CTS DI
UART clear
send
VOH 1.35 1.8
2
VOL
0
0.45
65
UART_RTS
DO
Send UART
request
VIH
1.2
1.8
2
VIL
-0.3
0.6
66
UART_DTR DI
UART data is
ready
VIH
1.2
1.8
2
VIL
-0.3
0.6
67
UART_TXD DO
UART send
data
VOH 1.35 1.8
2
VOL
0
0.45
68
UART_RXD DI
UART receive
data
VIH
1.2
1.8
2
VIL
-0.3
0.6
When users want to use the full-featured serial port, you can refer to the following
connection methods: