--- product_id: 101969245 title: "USR-N540 4 Ports Serial RS232 / RS485 / RS422 to RJ45 Ethernet Converter" brand: "horsebiz" price: "7429638₫" currency: VND in_stock: true reviews_count: 6 category: "Horsebiz" url: https://www.desertcart.vn/products/101969245-usr-n540-4-ports-serial-rs232-rs485-rs422-to-rj45 store_origin: VN region: Vietnam --- # ARM Cortex-M4 low power & high speed RJ45 Ethernet 10/100Mbps TCP/IP 4 serial ports RS232/485/422 USR-N540 4 Ports Serial RS232 / RS485 / RS422 to RJ45 Ethernet Converter **Brand:** horsebiz **Price:** 7429638₫ **Availability:** ✅ In Stock ## Summary > 🌟 Connect Smarter, Manage Faster — The Ultimate Serial-to-Ethernet Powerhouse! ## Quick Answers - **What is this?** USR-N540 4 Ports Serial RS232 / RS485 / RS422 to RJ45 Ethernet Converter by horsebiz - **How much does it cost?** 7429638₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/101969245-usr-n540-4-ports-serial-rs232-rs485-rs422-to-rj45) ## Best For - horsebiz enthusiasts ## Why This Product - Trusted horsebiz brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Quad-Port Connectivity:** Seamlessly link up to 4 serial devices simultaneously with RS232, RS485, and RS422 interfaces for ultimate versatility. - • **Powerful ARM Cortex-M4 Core:** Experience lightning-fast, stable performance with a low-power ARM processor designed for demanding industrial networking. - • **Plug & Play Ethernet Integration:** RJ45 port with 10/100Mbps speed and full TCP/IP stack support ensures effortless device networking and remote management. - • **Robust Industrial-Grade Protection:** Built-in 2KV electromagnetic isolation, ESD, surge, and overcurrent safeguards keep your connections rock-solid in harsh environments. - • **User-Friendly Web Interface & Firmware Upgrades:** Customize settings easily via built-in webpage, restore defaults with one key, and upgrade firmware over the network to stay ahead. ## Overview The USR-N540 is a professional-grade 4-port serial device server that converts RS232/RS485/RS422 signals to Ethernet via a high-speed ARM Cortex-M4 processor. Featuring a robust TCP/IP protocol stack, 10/100Mbps RJ45 connectivity, and industrial protections, it enables seamless, low-power, and stable networking of multiple serial devices. Its intuitive web interface and network firmware upgrade capabilities make it a must-have for modern embedded device networking. ## Description USR-N540, a four serial device server, can realize transparent transmission between TCP/UDP data package and RS232/RS485/RS422 interface. it is based on ARM processor,low power, rapid speed and high stability. And N540 is internally integrated with TCP/IP protocol. User can easily realize embedded device networking. RJ45 - Port: 1 Standard: 4 pin RJ45 Speed rate: 10/100Mbps, MDI/MDIX Protection: 2KV electromagnetic isolation Protocal: IP, TCP, UDP, DHCP, DNS, HTTP, ARP, ICMP, Websocket, HTTPD Client Buffer: TX: 16K byte, RX: 16K bytes COM Port -- Port: RS232 / RS485 / RS485 x 4, can work at the same time Standard: RS232: DB9 male connector, RS485: A+ B-, RS422: (A, B, Y, Z) Baud rate: 600-230.4K bps Data bit: 5, 6, 7, 8 Parity bit: None, Odd, Even, Space, Mark Stop bit: 1, 2 Buffer: TX: 2K byte, RT: 2K byte Flow control: RTS/CTS RS485 resistor: 2.2K Ω Protection: ESD 2KV, lighting, surge, over current Power Input -- Voltage: 5-36 V Type: DC jacker and + - terminal Working current: 53mA (average) 12 V Protection: ESD, lighting Working Environment -- Working tempreture: -40 - 85 °C Storage tempreture: -40 - 105 °C Storage humidity: 5% - 95% (no condensation) Dimensions: 222x122x29 mm, without terminal Certification: CE, FCC, ROHS, WEEE Packing List Serial Device Server x 1 RS232 to RS485/RS422 converter x 4 Power adapter x 1 Serial cable x 1 ## Features - USR-N540, Four serial ports device server,RS232 / RS485 / RS422 interface,TI cortex-M4 solution, ARM processor and TCP/IP protocol stack,DNS, DHCP, Websocket and HTTPD Client supported - Built-in webpage, support customized,Reload button,one key to restore factory defaults,Multiple indicator LEDs for easy debugging,Keepalive function,rapidly detect dead links - Can upgrade firmware via network easily,Account and password to page login and network settings,Support UDP broadcast,send and receive data from all IP in LAN - Global unique MAC address bought from IEEE, can be defined,Virtual serial port, setup and test software is availiable - Provide PC TCP/IP SOCKET programming example: VB, C++, Delphi, Android, IOS ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07KWYC1W9 | | Best Sellers Rank | #1,294 in Serial Adapters | | Brand | Horsebiz | | Compatible Devices | PC | | Connector Type | RJ45 | | Customer Reviews | 3.8 out of 5 stars 12 Reviews | | Finish | Magnetic | | Finish Type | Magnetic | | Input Voltage | 36 Volts | | Item Dimensions | 3.54 x 3.31 x 0.98 inches | | Item Weight | 1.25 Kilograms | | Item dimensions L x W x H | 3.54 x 3.31 x 0.98 inches | | Manufacturer | USR | | Mfr Part Number | Horsebiz USR N540 | | Model Number | N540 | | Nominal Power | 0.64 Watts | | Number of Items | 1 | | Number of Ports | 4 | | Package Quantity | 1 | | Power Plug Type | No Plug | | UPC | 661787213320 744430659543 702669843140 | | Unit Count | 1 Count | | Warranty Description | 1 | ## Product Details - **Brand:** Horsebiz - **Compatible Devices:** PC - **Connector Type:** RJ45 - **Finish Type:** Magnetic - **Item dimensions L x W x H:** 3.54 x 3.31 x 0.98 inches ## Images ![USR-N540 4 Ports Serial RS232 / RS485 / RS422 to RJ45 Ethernet Converter - Image 1](https://m.media-amazon.com/images/I/516ucKEl4sL.jpg) ![USR-N540 4 Ports Serial RS232 / RS485 / RS422 to RJ45 Ethernet Converter - Image 2](https://m.media-amazon.com/images/I/51n8AC8irlL.jpg) ![USR-N540 4 Ports Serial RS232 / RS485 / RS422 to RJ45 Ethernet Converter - Image 3](https://m.media-amazon.com/images/I/51ErCLL0vUL.jpg) ## Questions & Answers **Q: Does it have a filter to ignore lines of data?** A: This Serial Device Server itself only supports transparent transmission, so it does not support filter data. Application software shall help to manage this. **Q: Does it work with linux?** A: Sorry it can not work with Linux. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by R***H on January 7, 2020* ### ⭐⭐ Review *by R***I on December 14, 2019* ### ⭐⭐⭐⭐⭐ Review *by N***N on October 1, 2019* ## Frequently Bought Together - 4 Serial Port RS232/RS485/RS422 to Ethernet Converter - CABLEMAX RS-232 LED Link Tester DB-9 Male to DB-9 Female - abcGoodefg 9 Pin RS-232 DB9 Male to Male Female to Female Serial Cable Gender Changer Coupler Adapter (10 Pack) --- ## 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.vn/products/101969245-usr-n540-4-ports-serial-rs232-rs485-rs422-to-rj45](https://www.desertcart.vn/products/101969245-usr-n540-4-ports-serial-rs232-rs485-rs422-to-rj45) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-05-22*