Table of Contents
Advertisement
CLM920 TD3 LTE Module Hardware Usage Guide
3.6 UART interface
3.6.1 Main serial port
The CLM920 TD3 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：
Pin
Signal name
62
UART_RI
63
UART_DCD
64
UART_CTS
65
UART_RTS
66
UART_DTR
67
UART_TXD
68
UART_RXD
When users want to use the full-featured serial port, you can refer to the following
connection methods:
Shanghai Yuge Information Technology co., LTD
Table 3-10 UART serial port signal definition
I/O
Description
UART ringing
DO
output
UART data
DO
carrier detection
UART clear
DO
send
Send UART
DI
request
UART data is
DI
ready
DO
UART send data
UART receive
DI
data
Level value (V)
parameter
Min
Typical
VOH
1.35
1.8
VOL
0
VOH
1.35
1.8
VOL
0
VOH
1.35
1.8
VOL
0
VIH
1.2
1.8
VIL
-0.3
VIH
1.2
1.8
VIL
-0.3
VOH
1.35
1.8
VOL
0
VIH
1.2
1.8
Rem
arks
Max
2
0.45
2
0.45
2
0.45
2
0.6
2
0.6
2
0.45
2
- 36 -
Advertisement
Table of Contents
