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
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