--- product_id: 77775542 title: "Double Serial Device RS232 RS485 RS422 Ethernet Server Modbus to MQTT lot Gateway Multi-Host Polling USR-N520 H7 Version" brand: "usr" price: "€ 92.86" currency: EUR in_stock: true reviews_count: 3 url: https://www.desertcart.ie/products/77775542-double-serial-device-rs232-rs485-rs422-ethernet-server-modbus-to store_origin: IE region: Ireland --- # 5-36V DC Modbus TCP 2 Ports Double Serial Device RS232 RS485 RS422 Ethernet Server Modbus to MQTT lot Gateway Multi-Host Polling USR-N520 H7 Version **Brand:** usr **Price:** € 92.86 **Availability:** ✅ In Stock ## Summary > 🔗 Connect, Control, Conquer! ## Quick Answers - **What is this?** Double Serial Device RS232 RS485 RS422 Ethernet Server Modbus to MQTT lot Gateway Multi-Host Polling USR-N520 H7 Version by usr - **How much does it cost?** € 92.86 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/77775542-double-serial-device-rs232-rs485-rs422-ethernet-server-modbus-to) ## Best For - usr enthusiasts ## Why This Product - Trusted usr brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Seamless Connectivity:** Experience effortless data transmission with RS232, RS485, and RS422 interfaces. - • **Built-In Web Interface:** Manage and monitor your device effortlessly through an intuitive built-in webpage. - • **Versatile Voltage Range:** Power up with a flexible input voltage of 5-36V DC, perfect for diverse applications. - • **Multi-Host Polling Support:** Connect multiple devices simultaneously with robust Modbus multi-host polling capabilities. - • **Enhanced Network Functionality:** Utilize DHCP, DNS, and network printing for a comprehensive networking experience. ## Overview The Double Serial Device RS232 RS485 RS422 Ethernet Server is a cutting-edge solution designed for seamless communication between TCP/UDP data packages and serial interfaces. With support for Modbus multi-host polling, a versatile voltage range, and a user-friendly web interface, this device is perfect for professionals seeking reliable and efficient data management. ## Description Double Serial Device RS232 RS485 RS422 Ethernet Server Modbus Multi-host Polling ## Features - 2 serial port, RS232 RS485 RS422 three-in-one.Device Server with Modbus; - Realize transparent transmission between TCP/UDP data package and RS232/RS485/RS422 interface; - Voltage range of 5~36V DC, Modbus RTU to Modbus TCP, CTS/RTS, XON/XOFF. - Support Modbus multi-host polling, support Modbus RTU to Modbus TCP, DHCP and DNS. - Support Built-in Webpage, Httpd Client and Websocket and network printing and watchdog mechanism. ## Technical Specifications | Specification | Value | |---------------|-------| | Input Voltage | 36 Volts | | Connector Type Used on Cable | RJ45 | | Number of Ports | 2 | | Compatible Devices | PC | | Specific Uses For Product | PC | | Unit Count | 1.0 Count | | Number of Items | 1 | | Item Weight | 0.65 Kilograms | | Package Quantity | 1 | | Item Dimensions | 8.27 x 5.91 x 1.97 inches | | Finish Types | Transparent | ## Images ![Double Serial Device RS232 RS485 RS422 Ethernet Server Modbus to MQTT lot Gateway Multi-Host Polling USR-N520 H7 Version - Image 1](https://m.media-amazon.com/images/I/61oiznPtgoL.jpg) ## Questions & Answers **Q: Does the device come with two DB9 screw termial headers?** A: USR-N520 supports DB9 male port. Not terminal type.Meanwhile, we will provide RS232 to RS485/RS422 convertor. **Q: Is a power supply included in the box?** A: None in my boxes. Can run off 12-24v dc with no problems. **Q: Does it have a filter to ignore lines of data?** A: Not that i know of. **Q: Once this device is configured, can i ssh into it to be able to access either one of the rs-232 ports behind it? (console into 2 network router)** A: USR-N520 does not support SSH, you can access the RS232 port behind it via TCP connection. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Nice little device - especially for the price *by A***J on Reviewed in the United States on July 19, 2018* I had a couple of RS232 only serial Modbus Slave devices, that would not play well with others, even when connected via individual RS232-485 adapters. ie I needed to multidrop them due to a shortage of serial ports on the RTU I was programming, and they would not cooperate.This adapter fills the niche. Setting it up as a Modbus over IP Slave it accepts connections on a couple of user selectable ports, and translates the Modbus over IP commands to Serial Modbus RTU commands and spits them out its ports.Each physical port is uniquely addressable in the format 192.168.50.120:1502 and 192.168.40.120:1503 in my case, and the Serial RTU address can be specified as part of the message, so the end of line slave device doesn't know the difference between this device and a dedicated serial line.I tested powering the unit from USB (USB to barrel connection), but it also has terminals, and I'm using them for a bit more voltage headroom (USB 5V is at the bottom of its acceptable supply range)The web page for setup and the (windows) software you can download seem to duplicate each other - I used the software to set the IP address, then the webpage for subsequent tinkering.There's no diagnostics I can see of for example the message bytes passing through, nor is there a DIN rail mount, but these are small things, especially at this price point. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Does what you want with built in utility *by S***N on Reviewed in the United States on November 27, 2022* Serial to Network or Network to Serial. Does what you want and has a great utility that lets you see the data without needing to connect to another device to confirm you see data. Just what we needed. ### ⭐⭐ 2.0 out of 5 stars Has a tendency to need to be power cycled *by Y***L on Reviewed in the United States on September 29, 2022* Has a tendency to need to be power cycled.At first I thought it was if it lost power and came up again before the DHCP server could be reached, so I put it on a UPS. No. Then fixed the IP address, again no.Then I thought it was the particular unit, and bought a replacement - still no.It stops working sometimes, and I cannot reach it by IP - and just unplugging power and powering on again, my data stream restarts. I am reading a serial device over telnet every second or a few times a second. --- ## 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.ie/products/77775542-double-serial-device-rs232-rs485-rs422-ethernet-server-modbus-to](https://www.desertcart.ie/products/77775542-double-serial-device-rs232-rs485-rs422-ethernet-server-modbus-to) --- *Product available on Desertcart Ireland* *Store origin: IE* *Last updated: 2026-05-23*