# LILYGO T-RS S3

> ESP32-S3 industrial communication board with isolated RS-232 and RS-485 modules (3000V isolation), 7–24V DC input via DB9 connector, Wi-Fi, and Bluetooth 5 LE for Modbus and industrial serial networking applications.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** ESP32-S3
- **Price:** ~$22.48
- **Product Readiness:** developer
- **CPU:** ESP32-S3 Dual-core Xtensa LX7
- **CPU Architecture:** Xtensa LX7
- **CPU Cores:** 2
- **RAM:** 512KB SRAM
- **Flash:** 8MB
- **Power:** 7-28V DC
- **Operating Voltage:** 3.3V
- **Antenna:** Built-in PCB antenna

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 5.0

## Open Source

- **Firmware:** Yes
- **Schematics:** No
- **PCB Layout:** No

## Compatible Firmware

arduino, platformio

## Use Cases

- industrial-automation
- iot
- iot-gateway
- field-data-logger

## Components

- **ESP32-S3** (mcu): Dual-core Xtensa LX7 240MHz ESP32-S3 with 8MB Flash, Wi-Fi and Bluetooth 5 LE — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-rs-s3&source=md-export)
- **RSM232MT5V** (other): Isolated RS-232 serial communication module with 3000V isolation and 1200–256000bps baud rate range — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.mornsun-power.com%2Fhtml%2Fpdf%2FRSM232MT5V.pdf&ref=openhardware.directory&product=lilygo-t-rs-s3&source=md-export)
- **RSM485MT5V** (other): Isolated RS-485 serial communication module with 3000V isolation, 5V/50mA output, 1200–256000bps baud rate range — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.mornsun-power.com%2Fhtml%2Fpdf%2FRSM485MT5V.pdf&ref=openhardware.directory&product=lilygo-t-rs-s3&source=md-export)

## Protocols

- **RS-232**
- **RS-485**
- **Modbus RTU**
- **UART**
- **I2C**

## Description

## Overview

The LILYGO T-RS S3 is an industrial-grade communication development board built around the ESP32-S3 dual-core Xtensa LX7 MCU with 8MB Flash, Wi-Fi, and Bluetooth 5 LE. It integrates two galvanically isolated serial communication modules: an RSM232MT5V RS-232 module and an RSM485MT5V RS-485 module, both with 3000V isolation voltage and 5V/50mA isolated output, supporting baud rates from 1200 to 256000 bps. Power input is 7–24V DC through a DB9 female connector, enabling direct industrial panel mounting. An onboard WS2812 RGB LED on GPIO1 and buttons for Reset, Boot, and IO2 round out the interface. The board is suitable for Modbus RTU gateways, industrial automation nodes, and SCADA edge devices.

## Where to Buy

- [LILYGO](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-rs-s3&ref=openhardware.directory&product=lilygo-t-rs-s3&source=md-export) — $22.48

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-rs-s3&ref=openhardware.directory&product=lilygo-t-rs-s3&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-RSC3&ref=openhardware.directory&product=lilygo-t-rs-s3&source=md-export)
- [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-rs-s3&source=md-export)

## Tags

`esp32-s3`, `rs485`, `rs232`, `modbus`, `industrial`, `serial`, `isolation`, `wifi`, `bluetooth`, `development-board`

## Images

![LILYGO T-RS S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-rs-s3/9ffee7474f29.jpg)
![LILYGO T-RS S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-rs-s3/4366eeceebcb.jpg)
![LILYGO T-RS S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-rs-s3/40be24943f95.jpg)
![LILYGO T-RS S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-rs-s3/943fd4b28637.jpg)
![LILYGO T-RS S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-rs-s3/0f2f8bc24693.jpg)
![LILYGO T-RS S3](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-rs-s3/aa15f39401df.png)

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