ELECTRONICS
STM32F107 RS-232 to Ethernet Gateway Circuit
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CASE ANALYSIS
Scenario
Design a gateway circuit to bridge RS-232 serial devices to Ethernet using an STM32F107 microcontroller, supporting Modbus TCP. The circuit integrates a MAX3232 level shifter, LAN8720 Ethernet PHY, and a 3.3V regulator with decoupling capacitors for reliable operation.
Key decisions
- STM32F107 chosen for integrated Ethernet MAC and UART peripherals
- MAX3232 provides 3.3V-compatible RS-232 level shifting
- Single 3.3V supply derived from 5V input using LDO regulator
- External terminal blocks allow connection to RS-232 and Ethernet networks
When to reuse this
Use when building an industrial IoT gateway that translates legacy RS-232 protocols to Ethernet, enabling cloud connectivity and remote monitoring.
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circuit-stm32f107-rs-232-to-ethernet-gateway-with-modbus-tcp-support