--- 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: "82.65 DT" currency: TND in_stock: true category: "Knacro" url: https://www.desertcart.tn/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion store_origin: TN region: Tunisia --- # 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:** 82.65 DT **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- (3.3V) by knacro - **How much does it cost?** 82.65 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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 included wiring diagram make setup effortless - • **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 The KNACRO RS422 to TTL/UART/MCU Serial Port Signal Conversion Module enables seamless full-duplex communication between RS422 and TTL devices at 3.3V or 5V. Featuring robust over-voltage and over-current protection circuits, SMD components for enhanced EMC, and intuitive LED indicators, this compact module ensures reliable, high-quality signal conversion even in demanding industrial environments. ## 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 | |---------------|-------| | ASIN | B078N1CFJF | | Best Sellers Rank | #524,871 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,418 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 | 0.64 ounces | | Item model number | RS422 to TTL UART MCU | | Manufacturer | KNACRO | | Package Dimensions | 6.14 x 3.39 x 0.63 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) ## 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.tn/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion](https://www.desertcart.tn/products/68561171-rs422-to-ttl-uart-mcu-serial-port-signal-mutual-conversion) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-10*