Product Info

LTE Module Series
EC25 Hardware Design
EC25_Hardware_Design 53 / 112
3.11. UART Interfaces
The module provides two UART interfaces: the main UART interface and the debug UART interface. The
following shows their features.
 The main UART interface supports 4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps,
230400bps, 460800bps and 921600bps baud rates, and the default is 115200bps. This interface is
used for data transmission and AT command communication.
 The debug UART interface supports 115200bps 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
Pin Name Pin No. I/O Description Comment
RI 62 DO Ring indicator
1.8V 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
TXD 67 DO Transmit data
RXD 68 DI Receive data
Pin Name Pin No. I/O Description Comment
DBG_TXD 12 DO Transmit data
1.8V power domain
DBG_RXD 11 DI Receive data