Product Info

LP
WA Module Series
BG95 Series Hardware Design
BG95_S
eries_Hardware_Design 50 / 106
3.11. U
ART 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 d
ebug UART interface supports a fixed baud rate of 115200 bps, and is used for software
debugging and log output.
 The G
NSS 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
A
T+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
m
ore details about these AT commands.
Pin N
ame
Pin N
o.
I/
O
De
scription
Com
ment
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