LPWA Module Series
BG95 Hardware Design
BG95_Hardware_Design 44 / 80
3.10. UART Interfaces
The module provides three UART interfaces: Main UART, Debug UART and GNSS UART interfaces.
Features of them are illustrated below:
The Main UART interface supports 9600bps, 19200bps, 38400bps, 57600bps, 115200bps,
230400bps, 460800bps and 921600bps baud rates, and the default is 115200bps. It is used for data
transmission and AT command communication, and supports RTS and CTS hardware flow control.
The default frame format is 8N1 (8 data bits, no parity, 1 stop bit).
The Debug UART interface supports a fixed baud rate of 115200bps, and is used for software
debugging and log output.
The GNSS UART interface supports 115200bps baud rate by default, and is used for GNSS data and
NMEA sentences output.
The following tables show the pin definition of the three UART interfaces.
Table 12: Pin Definition of Main UART Interface
AT+IPR
command can be used to set the baud rate of the Main UART interface, and
AT+IFC
command
can be used to set the hardware flow control (hardware flow control is disabled by default). Please refer to
document [2]
for more details about these AT commands.
Pin Name
Pin No.
I/O
Description
Comment
DTR 30 DI
Data terminal ready.
Sleep mode control
1.8V power domain
RXD
34
DI
Receive data
1.8V power domain
TXD
35
DO
Transmit data
1.8V power domain
CTS
36
DO
Clear to send
1.8V power domain
RTS
37
DI
Request to send
1.8V power domain
DCD
38
DO
Data carrier detection
1.8V power domain
RI
39
DO
Ring indication signal
1.8V power domain
NOTE
