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CIRCUIT · STM32 RS232 ETHERNET

STM32 RS-232 to Ethernet Circuit Diagrams

Designing an STM32-based system that bridges RS-232 serial communication to Ethernet? Whether you're building an industrial gateway, a legacy device adapter, or a networked sensor hub, these circuit diagrams show you proven ways to connect STM32 microcontrollers with RS-232 transceivers and Ethernet PHYs. Browse the examples below, then use our online circuit diagram maker to customize your own schematic—no CAD software required.

3 EXAMPLES· UPDATED 2026-08-07
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EMBEDDED SYSTEMS

STM32H7 RS-232 Ethernet Router

CIRCUIT DESIGN

STM32L4 RS-232 Ethernet Bridge

ELECTRONICS

STM32F107 RS-232 to Ethernet Gateway Circuit

ABOUT

About these examples.

Each example includes detailed component selections and wiring hints. Perfect for embedded engineers and hardware designers who need a solid starting point.

HOW TO

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  1. 1

    Select STM32 MCU

    Pick an STM32 with Ethernet MAC and UART peripherals, like STM32F107 or STM32H7, from the component library.

  2. 2

    Place RS-232 Transceiver

    Add a MAX3232 or similar chip to convert RS-232 voltage levels to the MCU’s UART logic.

  3. 3

    Add Ethernet PHY

    Include a PHY such as LAN8720 or DP83848, connected via RMII to the STM32 MAC.

  4. 4

    Wire Signal Paths

    Connect UART TX/RX to the transceiver, and RMII/MDC/MDIO lines between MCU and PHY.

  5. 5

    Label and Export

    Annotate nets with signal names, then download your circuit diagram as a clean PDF or image.

FAQ

Frequently asked questions

Which STM32 series support both RS-232 and Ethernet?01
STM32F107, F207, F4, F7, and H7 families include Ethernet MAC peripherals and multiple UARTs suitable for RS-232.
Do I need an external Ethernet PHY?02
Yes. Most STM32 MCUs with Ethernet require an external physical layer transceiver, such as the LAN8720 or DP83848, connected via RMII.
How do I level-shift RS-232 signals for an STM32?03
Use a dedicated RS-232 transceiver like MAX3232 (3.3V) to convert the ±12V RS-232 levels to 3.3V UART logic.
Can these diagrams be used in commercial products?04
They are example designs. You should validate component values, PCB layout, and compliance for your specific product requirements.
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