> ## Documentation Index
> Fetch the complete documentation index at: https://learn.pcbcupid.com/llms.txt
> Use this file to discover all available pages before exploring further.

> RS485 transceiver is a communication interface device that converts UART signals into differential RS-485 signals, enabling reliable long-distance and noise-resistant serial communication between multiple devices.

# RS-485 Transceiver

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An **RS-485 Transceiver Module** is a compact communication device designed to interface a microcontroller (e.g., Arduino, ESP32, GLYPH, STM32) for long-distance, reliable serial communication. Unlike standard UART (TTL), RS-485 uses differential signaling to resist electrical noise, making it suitable for industrial environments.

In this document, you will understand how to interface the RS-485 Transceiver with GLYPH, enabling robust data transfer for applications such as Modbus networking, industrial automation, and remote sensor monitoring.

***

## Pin Configuration

| Pin            | MCU Connection | Description                                        |
| :------------- | :------------- | :------------------------------------------------- |
| **V (VCC)**    | 3.3V / 5V      | Power supply input                                 |
| **G (GND)**    | GND            | Ground reference                                   |
| **TX**         | MCU TX         | Transmit data input                                |
| **RX**         | MCU RX         | Receive data output                                |
| **DE**         | Control Pin    | **Driver Enable** (HIGH = Transmit, LOW = Receive) |
| **A**          | RS-485 Bus     | Non-inverting differential line                    |
| **B**          | RS-485 Bus     | Inverting differential line                        |
| **G (RS-485)** | Bus Ground     | Ground reference for RS-485 bus (optional)         |

***

## Key Features

* Differential signaling for high noise immunity
* Long-distance communication (up to \~1200 meters)
* Supports multi-device (multi-drop) network
* Half-duplex communication support
* UART to RS-485 signal conversion
* Low power operation

***

## Applications

* Industrial automation systems
* Modbus communication networks
* Smart energy meters
* Building automation & HVAC control
* PLC and SCADA systems
* Long-distance sensor networks

***

## Step 1: Hardware Required

1. **Glyph Board** (e.g., Glyph ESP32-C3)
2. **G-MOD RS-485 Transceiver Module**

***

## Step 2: Circuit Diagram

![RS-485 Circuit Diagram](https://files.pcbcupid.com/Documentation/Boards/g-mod/RS485_Transreciever%20/RS485%20CIRCUIT%20DAIGRAM/RS485_20260327T071505.png)

***