Quectel BG77 - Page 44

LPWA Module Series
BG77 Hardware Design
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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.
Table 13: Pin Definition of Debug UART Interface
Table 14: Pin Definition of GNSS UART Interface
The logic levels of UART interfaces are described in the following table.
Pin Name Pin No. I/O Description Comment
DTR 62 DI
Data terminal ready.
Sleep mode control.
1.8V power domain
RXD 6 DI Receive data 1.8V power domain
TXD 7 DO Transmit data 1.8V power domain
CTS 39 DO Clear to send 1.8V power domain
RTS 38 DI Request to send 1.8V power domain
DCD 90 DO Data carrier detection 1.8V power domain
RI 76 DO Ring indication signal 1.8V power domain
Pin Name Pin No. I/O Description Comment
DBG_TXD 60 DO Transmit data 1.8V power domain
DBG_RXD 61 DI Receive data 1.8V power domain
Pin Name Pin No. I/O Description Comment
GNSS_UART_TXD 36 DO Transmit data 1.8V power domain
GNSS_UART_RXD 4 DI Receive data 1.8V power domain
NOTE