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Serial Port

The MCBSTM32F200 board connects the on-chip serial UART to the ST3232C (IC17), which converts the logic signals to RS-232 voltage levels.

MCBSTM32F200 Board Serial Port

Jumpers J13 and J14 allow you to connect transmit data (TXD) and receive data (RXD) signals from the ST3232C to UART1 or UART3/UART4 on the MCU.


  • For V1.1 boards only, the RX3/4-RX1 label printed at J13, and the TX3/4-TX1 label printed at J14 are incorrect. For this version of the board, they should be labeled:
    J13 TX1-TX3/4
    J14 RX1-RX3/4
    as shown in the above picture.

The serial port (UART1/3/4) is configured as a standard 3-wire interface. The DB9 connector is wired directly to the ST3232C serial interface. Refer to the figure below for details.

Serial Port DB9 Diagram

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