LilyGO T-RSS3 ESP32-S3 Development Board w/ RS232 & RS485 5V Module

The board accepts a wide DC input voltage range of 7V to 24V. Connect your power supply's positive lead to the DC input terminal and the negative to GND. The onboard regulator steps this down to provide stable 5V power to the ESP32-S3 and the isolated RS232/RS485 transceiver modules. Ensure your power supply can deliver sufficient current for your connected peripherals beyond the board's base consumption.

The integrated RSM232MT5V and RSM485MT5V modules connect to the ESP32-S3 via UART TTL lines. You will need to check the board's pinout diagram, but typically, a specific UART port (e.g., UART1 or UART2) is hardwired to these modules. In your Arduino or ESP-IDF code, you must initialize the corresponding Serial object using the predefined pins. The isolation modules handle the level conversion and signal driving for the RS232 DB9 and RS485 terminals.

Yes, the LilyGO T-RSS3 is designed to operate both isolated serial interfaces concurrently. Each module uses a separate UART channel from the ESP32-S3. This allows you to communicate with an RS232 device (like a barcode scanner) and an RS485 network (like Modbus sensors) at the same time. You must manage both serial streams in your firmware, ensuring correct baud rate settings (configurable from 1200 to 256000 bps) and protocol handling for each independent data link.

The board is fully compatible with the Arduino IDE using the ESP32 board package and the official Espressif ESP-IDF framework. For Arduino, select 'ESP32S3 Dev Module' as your board. For ESP-IDF, target the ESP32-S3 chip. The USB Type-C port provides both power and a serial programming/debugging interface. Remember to install the necessary USB drivers (CP210x or similar) and hold the BOOT (GPIO0) button while pressing Reset to enter download mode for initial firmware flashing.