T-Industry STM32F407, User Manual

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6.13. GPS / GPRS module (optional)
There is optionally Quectel M95 GPS / GPRS module on the board.
Module connection is shown on the image below. Power supply of the
module is initially switched off.
To switch on the power supply apply
high logic level at signal GSM_ENABLE (PA0).
Signal name Processor pin Alternate function
GSM_ENABLE PA0
GSM_TX PB6 USART1
GSM_RX PB7 USART1
GSM_PWK PC0
GSM_STAT PC3