Product Info

LTE Standard Module Series
EC25 Series Hardware Design
EC25_Series_Hardware_Design 54 / 134
bps, 230400 bps, 460800 bps and 921600 bps baud rates, and the default is 115200 bps. It also
supports RTS and CTS hardware flow control, and can be used for data transmission and AT
command communication.
⚫ The debug UART interface supports 115200 bps baud rate. It is used for Linux console and log
output.
The following tables show the pin definition of the UART interfaces.
Table 11: Pin Definition of Main UART Interface
Table 12: Pin Definition of Debug UART Interface
The logic levels are described in the following table.
Table 13: Logic Levels of Digital I/O
Pin Name
Pin No.
I/O
Description
Comment
RI
62
DO
Ring indicator
1.8 V power domain
DCD
63
DO
Data carrier detection
CTS
64
DO
Clear to send
RTS
65
DI
Request to send
DTR
66
DI
Data terminal ready,
sleep mode control
TXD
67
DO
Transmit data
RXD
68
DI
Receive data
Pin Name
Pin No.
I/O
Description
Comment
DBG_TXD
12
DO
Transmit data
1.8 V power domain
DBG_RXD
11
DI
Receive data
Parameter
Min.
Max.
Unit
V
IL
-0.3
0.6
V
V
IH
1.2
2.0
V