--- product_id: 68561171 title: "RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (5V)" brand: "knacro" price: "€ 19.93" currency: EUR in_stock: true category: "Knacro" url: https://www.desertcart.gr/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion store_origin: GR region: Greece --- # 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- (5V) **Brand:** knacro **Price:** € 19.93 **Availability:** ✅ In Stock ## Summary > ⚡ Convert with Confidence: Power, Protect, Perform! ## Quick Answers - **What is this?** RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (5V) by knacro - **How much does it cost?** € 19.93 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/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 - • **Instant Visual Feedback:** Power and transmission LEDs keep you informed at a glance - • **Full-Duplex Communication:** Enables simultaneous two-way RS422 and TTL/UART data exchange without lag - • **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 - • **Universal Voltage Compatibility:** Seamlessly supports both 3.3V and 5V TTL systems for versatile integration ## Overview This RS422 to TTL/UART/MCU conversion module offers reliable full-duplex serial communication with robust over-voltage and over-current protection. Designed with SMD components for enhanced EMC, it supports both 3.3V and 5V TTL levels, ensuring seamless integration and durability in demanding environments. Equipped with intuitive power and TX/RX indicator LEDs, it guarantees real-time status visibility for professional-grade 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 ## 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 | |---------------|-------| | Best Sellers Rank | #251 in Serial Port Cards | | Customer Reviews | 5.0 out of 5 stars 2 Reviews | ## Images ![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (5V) - Image 1](https://m.media-amazon.com/images/I/812UQ18vlXL.jpg) ![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (5V) - Image 2](https://m.media-amazon.com/images/I/81u8t+qAKAL.jpg) ![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (5V) - Image 3](https://m.media-amazon.com/images/I/819UIBecGkL.jpg) ![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (5V) - Image 4](https://m.media-amazon.com/images/I/81zwIlpSxhL.jpg) ![RS422 to TTL/UART/MCU Serial Port Signal Mutual Conversion Module with Over-Voltage Over-Current Protection- (5V) - Image 5](https://m.media-amazon.com/images/I/81jFv3ArmFL.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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion](https://www.desertcart.gr/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-10-28*