--- product_id: 101969245 title: "4 Serial Port RS232/RS485/RS422 to Ethernet Converter" brand: "pusr" price: "R5678" currency: ZAR in_stock: true reviews_count: 6 category: "Pusr" url: https://www.desertcart.co.za/products/101969245-4-serial-port-rs232-rs485-rs422-to-ethernet-converter store_origin: ZA region: South Africa --- # Low power ARM Cortex-M4 processor 10/100Mbps Ethernet with TCP/IP stack 4 serial ports RS232/RS485/RS422 4 Serial Port RS232/RS485/RS422 to Ethernet Converter **Brand:** pusr **Price:** R5678 **Availability:** ✅ In Stock ## Summary > 🌟 Connect Smarter, Work Faster — The Ultimate Serial-to-Ethernet Gateway! ## Quick Answers - **What is this?** 4 Serial Port RS232/RS485/RS422 to Ethernet Converter by pusr - **How much does it cost?** R5678 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/101969245-4-serial-port-rs232-rs485-rs422-to-ethernet-converter) ## Best For - pusr enthusiasts ## Why This Product - Trusted pusr brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Quad-Port Powerhouse:** Seamlessly connect 4 serial devices simultaneously with RS232, RS485, and RS422 interfaces for ultimate versatility. - • **Plug & Play Networking:** Built-in TCP/IP stack with DHCP, DNS, Websocket, and HTTPD client support ensures effortless embedded device networking. - • **ARM Cortex-M4 Efficiency:** Experience lightning-fast, low-power performance powered by a robust ARM processor designed for stability and speed. - • **Industrial-Grade Durability:** Operate confidently in extreme environments from -40°C to 85°C with 2KV electromagnetic isolation and surge protection. - • **Smart Management & Security:** Secure your connections with account/password login, firmware upgrades over the network, and multiple LED indicators for real-time debugging. ## Overview The USR-N540 is a professional-grade 4-port serial device server that converts RS232/RS485/RS422 signals to Ethernet with a built-in ARM Cortex-M4 processor and full TCP/IP protocol support. Designed for industrial environments, it offers robust security, easy network management, and reliable high-speed data transmission at 10/100Mbps, making it the go-to solution for seamless 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 Review: Great device, takes some time to learn software - Great device. These work really well for serial devices. It takes a little time to understand the nomenclature, but it is set up very well. Can easily connect up to 4 serial devices via 232, 485, etc. Thank you! Review: The product works fine but software is buggy - It's works fine when it works. However after some time one can't telnet to serial port. It becomes unresponsive. One cans till ping to main IP address. Power cycling fixes it but it ends up in same state after some time. Hardware wise it's well designed and built product and very economical in comparison to MOXA but software is buggy. Returned. ## 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 | #946 in Serial Adapters | | Brand | PUSR | | Color | Black | | 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 kg | | Item dimensions L x W x H | 3.54 x 3.31 x 0.98 inches | | Manufacturer | Jinan USR IOT Technology Limited | | Mfr Part Number | 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 | | Warranty Type | Limited | ## Product Details - **Brand:** PUSR - **Color:** Black - **Compatible Devices:** PC - **Connector Type:** RJ45 - **Item dimensions L x W x H:** 3.54 x 3.31 x 0.98 inches ## Images ![4 Serial Port RS232/RS485/RS422 to Ethernet Converter - Image 1](https://m.media-amazon.com/images/I/61UXWNc5Q4S.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 ### ⭐⭐⭐⭐⭐ Great device, takes some time to learn software *by R***H on January 7, 2020* Great device. These work really well for serial devices. It takes a little time to understand the nomenclature, but it is set up very well. Can easily connect up to 4 serial devices via 232, 485, etc. Thank you! ### ⭐⭐ The product works fine but software is buggy *by R***I on December 14, 2019* It's works fine when it works. However after some time one can't telnet to serial port. It becomes unresponsive. One cans till ping to main IP address. Power cycling fixes it but it ends up in same state after some time. Hardware wise it's well designed and built product and very economical in comparison to MOXA but software is buggy. Returned. ### ⭐⭐⭐⭐⭐ Good product. *by N***N on October 1, 2019* This worked exactly as advertised. I recommend it. ## 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.co.za/products/101969245-4-serial-port-rs232-rs485-rs422-to-ethernet-converter](https://www.desertcart.co.za/products/101969245-4-serial-port-rs232-rs485-rs422-to-ethernet-converter) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-10-30*