Product Info

LPWA Module Series
BG95 Series Hardware Design
BG95_Series_Hardware_Design 49 / 106
3.11. UART Interfaces
The module provides three UART interfaces: the main UART, debug UART and the GNSS UART
interfaces. Features of them are illustrated below:
⚫ The main UART interface supports 9600 bps, 19200 bps, 38400 bps, 57600 bps, 115200 bps,
230400 bps, 460800 bps and 921600 bps baud rates, and the default is 115200 bps. 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 115200 bps, and is used for software
debugging and log output.
⚫ The GNSS UART interface supports 115200 bps 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 13: 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 (the function is disabled by default). See document [2] for
more details about these AT commands.
Pin Name
Pin No.
I/O
Description
Comment
MAIN_DTR
30
DI
Main UART data terminal ready
1.8 V power domain
MAIN_RXD
34
DI
Main UART receive
1.8 V power domain
MAIN_TXD
35
DO
Main UART transmit
1.8 V power domain
MAIN_CTS
36
DO
Main UART clear to send
1.8 V power domain
MAIN_RTS
37
DI
Main UART request to send
1.8 V power domain
MAIN_DCD
38
DO
Main UART data carrier detect
1.8 V power domain
MAIN_RI
39
DO
Main UART ring indication
1.8 V power domain
NOTE