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.
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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.
Make one yourself.
Select STM32 MCU
Pick an STM32 with Ethernet MAC and UART peripherals, like STM32F107 or STM32H7, from the component library.
Place RS-232 Transceiver
Add a MAX3232 or similar chip to convert RS-232 voltage levels to the MCU’s UART logic.
Add Ethernet PHY
Include a PHY such as LAN8720 or DP83848, connected via RMII to the STM32 MAC.
Wire Signal Paths
Connect UART TX/RX to the transceiver, and RMII/MDC/MDIO lines between MCU and PHY.
Label and Export
Annotate nets with signal names, then download your circuit diagram as a clean PDF or image.
Frequently asked questions
Which STM32 series support both RS-232 and Ethernet?
Do I need an external Ethernet PHY?
How do I level-shift RS-232 signals for an STM32?
Can these diagrams be used in commercial products?
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