---
product_id: 180602834
title: "4 Serial Port RS232/RS485/RS422 to Ethernet Converter (UK Plug)"
brand: "horsebiz"
price: "€ 300.36"
currency: EUR
in_stock: true
reviews_count: 5
category: "Horsebiz"
url: https://www.desertcart.fi/products/180602834-4-serial-port-rs232-rs485-rs422-to-ethernet-converter-uk
store_origin: FI
region: Finland
---

# ARM Cortex-M4 low power & high speed Full TCP/IP stack with DHCP & DNS 4 serial ports RS232/485/422 4 Serial Port RS232/RS485/RS422 to Ethernet Converter (UK Plug)

**Brand:** horsebiz
**Price:** € 300.36
**Availability:** ✅ In Stock

## Summary

> 🌟 Power Your Legacy Devices with Next-Gen Network Magic!

## Quick Answers

- **What is this?** 4 Serial Port RS232/RS485/RS422 to Ethernet Converter (UK Plug) by horsebiz
- **How much does it cost?** € 300.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/180602834-4-serial-port-rs232-rs485-rs422-to-ethernet-converter-uk)

## 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

- • **ARM Cortex-M4 Engine:** Experience lightning-fast, stable performance with a cutting-edge ARM processor designed for low power consumption.
- • **Quad-Port Powerhouse:** Connect and control 4 serial devices simultaneously with RS232, RS485, and RS422 interfaces.
- • **Robust Industrial Grade:** Operate reliably in extreme environments (-40°C to 85°C) with 2KV ESD protection and surge resistance.
- • **User-Friendly Web Interface:** Customize settings and monitor status easily via a built-in webpage with secure login and one-key factory reset.
- • **Seamless Network Integration:** Built-in TCP/IP stack supports DHCP, DNS, UDP broadcast, and Websocket for effortless device networking.

## Overview

The USR-N540 is a professional-grade 4-port serial device server that bridges RS232, RS485, and RS422 serial devices to Ethernet networks. Powered by an ARM Cortex-M4 processor and integrated TCP/IP stack, it ensures fast, stable, and low-power operation. Featuring a user-friendly web interface, multiple protocol support, and industrial-level protections, it’s the ultimate solution for seamless, secure, and scalable serial-to-Ethernet connectivity in demanding environments.

## 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. 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: Aunque viene sin instrucciones, se pueden encontrar fácilmente en internet. Funciona muy bien, tiene servidores TCP/UDP para cada puerto serie, es fácil de configurar y de usar. Se puede encontrar Sw que te instala los puertos serie remotos como puertos locales, probado con aplicaciones como teraterm, moba, en incluso para depuracion con eclipse. La única pega es que viene con enchufe inglés y necesite un adaptador

## 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 | 243,195 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 92 in Serial Port Cards |
| Guaranteed software updates until | unknown |
| Item model number | N540 |
| Manufacturer | Jinan USR IOT Technology Limited |
| Product Dimensions | 9 x 8.4 x 2.5 cm; 1.25 kg |

## Product Details

- **Brand:** Horsebiz
- **Colour:** UK Plug
- **Compatible devices:** PC
- **Connector type:** RJ45
- **Item dimensions L x W x H:** 9 x 8.4 x 2.5 centimetres

## Images

![4 Serial Port RS232/RS485/RS422 to Ethernet Converter (UK Plug) - Image 1](https://m.media-amazon.com/images/I/516ucKEl4sL.jpg)
![4 Serial Port RS232/RS485/RS422 to Ethernet Converter (UK Plug) - Image 2](https://m.media-amazon.com/images/I/51n8AC8irlL.jpg)
![4 Serial Port RS232/RS485/RS422 to Ethernet Converter (UK Plug) - Image 3](https://m.media-amazon.com/images/I/51ErCLL0vUL.jpg)

## Available Options

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

## 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 7 January 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!

### ⭐⭐⭐⭐⭐ Review
*by S***F on 26 April 2020*

Aunque viene sin instrucciones, se pueden encontrar fácilmente en internet. Funciona muy bien, tiene servidores TCP/UDP para cada puerto serie, es fácil de configurar y de usar. Se puede encontrar Sw que te instala los puertos serie remotos como puertos locales, probado con aplicaciones como teraterm, moba, en incluso para depuracion con eclipse. La única pega es que viene con enchufe inglés y necesite un adaptador

### ⭐⭐ Review
*by R***I on 14 December 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.

## Frequently Bought Together

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**Shop now:** [https://www.desertcart.fi/products/180602834-4-serial-port-rs232-rs485-rs422-to-ethernet-converter-uk](https://www.desertcart.fi/products/180602834-4-serial-port-rs232-rs485-rs422-to-ethernet-converter-uk)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-24*