---
product_id: 68561171
title: "RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V)"
brand: "knacro"
price: "683 Ft"
currency: HUF
in_stock: false
reviews_count: 1
url: https://www.desertcart.hu/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion
store_origin: HU
region: Hungary
---

# Over-voltage & over-current protection Power & TX/RX indicator LEDs Full-duplex RS422 signal conversion RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V)

**Brand:** knacro
**Price:** 683 Ft
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Convert with Confidence — Power Your Serial Communication Like a Pro!

## Quick Answers

- **What is this?** RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V) by knacro
- **How much does it cost?** 683 Ft with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion)

## Best For

- knacro enthusiasts

## Why This Product

- Trusted knacro brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug-and-Play Wiring:** Clear terminal pinouts and wiring diagram for hassle-free setup
- • **Visual Status Indicators:** Power and send/receive LEDs keep you informed at a glance
- • **Dual Voltage Compatibility:** Seamlessly supports both 3.3V and 5V TTL systems for versatile integration
- • **Rock-Solid Signal Integrity:** SMD components boost EMC for flawless data flow in harsh environments
- • **Real-Time Circuit Protection:** Built-in over-voltage and over-current safeguards keep your MAX490 chip safe

## Overview

This RS422 to TTL/UART/MCU conversion module enables seamless full-duplex serial communication between RS422 and TTL devices at 3.3V or 5V levels. Featuring robust over-voltage and over-current protection circuits, it safeguards the MAX490 chip for reliable operation. The use of SMD components enhances electromagnetic compatibility, ensuring stable performance even in challenging environments. Equipped with power and TX/RX indicator LEDs and a clear wiring diagram, it offers an easy, professional-grade solution for serial port signal conversion.

## Description

Module interface definition: Module 4P Terminal side: VCC: + 3.3V/5V TXD : The module's TTL (UART) to send, connected to the microcontroller's RXD receiver pin; RXD : The module's TTL (UART) receiver, connected to the microcontroller TXD send pin; GND : The module ground wire (this wire must be connected with the ground wire of microcontroller system); Module 5P Terminal side: R + / A : A-Pin of this module, connected to T + / Y pin of other 422 modules; R- / B : B-Pin of this module, connected toT- / Z pin of other 422 modules; T- / Z -: Z-Pin of this module, connected to R- / B of other 422 modules; T + / Y : Y-Pin of this module, connected to R + / A pin of other 422 modules; GND : Ground wire; Package Included: 1xRS422 to TTL / UART / MCU Serial Port Signal Mutual Conversion Module

Review: Works for Encoder SSI. - worked perfectly to bitbang from an STM32 to an SSI encoder.

## Features

- The module is suitable for 3.3V/5V TTL and RS422 signal mutual conversion, RS422 level is full-duplex level signal, the use of this module can be achieved SCM serial port and RS422 signal conversion.
- With over-voltage and over-current protection circuit real-time protection RS422 level signal to protect the MAX490 chip's normal work.
- The module except for the pin, Use SMD components to ensure better signal transmission, thereby enhancing the system EMC and other characteristics, the module as possible in more harsh environments.
- With power and send & receive Indicator lights.
- The back of the product with wiring diagram.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B078N1CFJF |
| Best Sellers Rank | #1,443,283 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #6,680 in Power Converters |
| Customer Reviews | 5.0 5.0 out of 5 stars (3) |
| Date First Available | December 26, 2017 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.528 ounces |
| Item model number | RS422 to TTL UART MCU |
| Manufacturer | KNACRO |
| Package Dimensions | 4.84 x 3.15 x 0.55 inches |

## Images

![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V) - Image 1](https://m.media-amazon.com/images/I/812gs23PzUL.jpg)
![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V) - Image 2](https://m.media-amazon.com/images/I/81XLUoXlblL.jpg)
![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V) - Image 3](https://m.media-amazon.com/images/I/81BIajVwrNL.jpg)
![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V) - Image 4](https://m.media-amazon.com/images/I/81HktDptJ-L.jpg)
![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (3.3V) - Image 5](https://m.media-amazon.com/images/I/81S2BdHNz+L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Dimensions of this module?**
A: 50.7*26.9MM.See the 9th image for more information: https://images-na.ssl-images-amazon.com/images/I/31r6svLqVqL._AC_.jpg

**Q: What is the maximum baud rate?**
A: Mine has an SP3490EN chip. The SP3490 datasheet says: "The  SP3490  and  SP3491  meet  the  electrical  specifications  of  the  RS-485  and  RS-422  serial  protocols  up  to  10Mbps  under  load. " Whether you can achieve that of course depends on other factors.

**Q: What IC does this use?**
A: SP3490EN is what mine came with.
https://www.maxlinear.com/ds/sp3490_sp3491.pdf

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works for Encoder SSI.
*by J***. on February 1, 2020*

worked perfectly to bitbang from an STM32 to an SSI encoder.

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-03-16*