User's Manual

LTE Module Series
EC25-V User Manual
EC25-V_User_Manual Confidential / Released 36 /
69
3.11. 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, and the default is 115200bps. This interface can be used for data transmission and AT
communication.
 Debug UART interface supports 115200bps baud rate. It can be used for Linux console and log
output.
The following tables show the pin definition.
Table 11: Pin Definition of the Main UART Interface
Pin Name
Pin No.
I/O
Description
Comment
RI
62
DO
Ring indicator
1.8V power domain
DCD
63
DO
Data carrier detection
1.8V power domain
CTS
64
DO
Clear to send
1.8V power domain
RTS
65
DI
Request to send
1.8V power domain
DTR
66
DI
Sleep mode control
1.8V power domain
TXD
67
DO
Transmit data
1.8V power domain
RXD
68
DI
Receive data
1.8V power domain
Table 12: Pin Definition of the Debug UART Interface
Pin Name
Pin No.
I/O
Description
Comment
DBG_TXD
12
DO
Transmit data
1.8V power domain
DBG_RXD
11
DI
Receive data
1.8V power domain
The logic levels are described in the following table.