1-Port Serial-to-IP Ethernet Device Server - RS232 - DIN Rail Mountable

A cost-effective way to connect, configure, and manage a remote RS-232 serial device over an IP network

Product ID: NETRS232

2,2 stars (5 reviews) |
  • A compact, cost-effective, serial-over-IP solution that includes a DIN rail mounting bracket
  • Redundant and flexible power input using the included power adapter, or 10~30V DC terminal block input
  • Safeguard your investment, with 15KV ESD (Electrostatic Discharge) protection
Your price
€118,99 EUR excl. VAT
€142,79 EUR incl. VAT

This 1-Port Serial Device Server lets you remotely access and manage an RS232 serial device over a local area network (LAN), for a simple and cost-effective serial-over-IP control solution.

For more control options, the device server is compatible with the free, StarTech.com NETRSAPP NETRSAPP. When coupled with the NETRS232, this handy application for iOS, Android, and Chrome Browser lets you build a custom serial control interface that’s tailored to your specific application. 

Flexible power and mounting options

For installation flexibility across a variety of environments, you can power the device server using the provided 12V DC power adapter, or using the integrated 10~30V DC terminal block.

Plus, the device server is DIN rail mountable for out-of-the-way installations.

Protects your investment

To help ensure reliable performance and prevent possible damage, the serial device server offers 15KV ESD (Electrostatic Discharge) protection, so you can rest assured that the device server won’t become damaged due to externally generated ESD.

Customizable and wide compatibility

This highly-customizable device server is easy to configure to suit your application. For easy setup, Windows users can use the provided Virtual COM port software, or the versatile web-based interface.

The RS232 device server supports Telnet (an operating system independent communication protocol), so it can be integrated into mixed OS environments (Windows, Mac, Linux). Plus, it supports VCOM, TCP Server/Client, UDP, HTTP, DHCP, ICMP(PING), Static IP, and ARP protocols.

Download the application software and manage your serial devices with ease

Download the StarTech.com serial control software from the Apple App Store, the Google Play™ Store, or the Chrome Web Store.

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The NETRS232 is backed by a StarTech.com 2-year warranty and free lifetime technical support.


  • Integrate the cost-effective serial device server into mixed OS environments
  • Manufacturing (CNC machinery, process control equipment, serial printers)
  • Security (UPS control, access key panels, video cameras, card readers)
  • Environmental control (lighting, temperature, clocks)
  • POS (credit/debit card readers, receipt printers, cash registers, scales)

Partner Numbers

  • Ingram Austria V933195
  • UPC 065030857161


  • Windows 8 logo
  • Windows 7 logo
  • Windows Server 2012 logo
  • Windows Server 2016 logo
  • Windows 10 logo
  • Windows Server 2019 logo
  • Windows 11 logo
  • Linux logo
Windows® 2000, XP, Vista, 7, 8, 8.1, 10, 11
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019
Linux: The included software does not support Linux to emulate a local COM port. Linux users would need to use Telnet.


Warranty Information Warranty 2 Years
Connector(s) 1 - Connector Type(s) DB-9 (9 pin, D-Sub)
Terminal Block (2 Wire)
Environmental Operating Temperature 0°C to 60°C (32°F to 140°F)
Storage Temperature -10°C to 70°C (14°F to 158°F)
Humidity 0~90% RH
Hardware Ports 1
Interface Serial
Industry Standards IEEE 802.3, IEEE 802.3u
Indicators 1 - LED Indicators Power
10/100Mbps LAN
Packaging Information Package Height 76,0 mm [3,0 in]
Package Length 17,5 cm [6,9 in]
Shipping (Package) Weight 444,0 g [15,7 oz]
Package Width 15,9 cm [6,3 in]
Performance Serial Protocol RS-232
Max Baud Rate 230.4 Kbps
Data Bits 5, 6, 7, 8
Flow Control RTS/CTS, None
Parity None, Even, Odd, Space, Mark
Stop Bits 1, 1.5, 2
Remote Management Ability Yes
Surge Protection 15KV ESD (Electrostatic Discharge) Protection
Compatible Networks 10/100 Mbps
Auto MDIX Yes
Supported Protocols VCOM, TCP Server, TCP Client, UDP, HTTP, DHCP, ICMP(PING), Static IP, ARP, Telnet
Physical Characteristics Weight of Product 68,0 g [2,4 oz]
Color Black
Material Plastic
Product Length 95,0 mm [3,7 in]
Product Width 55,0 mm [2,2 in]
Product Height 2,2 cm [0,9 in]
Power Power Source AC Adapter Included
Input Voltage 100 - 240 AC
Input Current 0.5 A
Output Voltage 12V DC
Output Current 1.2 A
Center Tip Polarity Positive
Plug Type H
Power Consumption (In Watts) 14.4
Software OS Compatibility Windows® 2000, XP, Vista, 7, 8, 8.1, 10, 11
Windows Server® 2003, 2008 R2, 2012, 2012 R2, 2016, 2019
Linux: The included software does not support Linux to emulate a local COM port. Linux users would need to use Telnet.
What's in the Box 1 - Included in Package Serial over IP Device Server
DIN Rail Kit
Terminal Block
Universal power adapter: comes ready for NA/EU/UK only when you buy in NA/EU/UK; comes ready for Australia and New Zealand only when you buy in Australia and New Zealand
Software CD
Instruction Manual



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Frequently Asked Questions


VCOM cannot be run as a service. A user must be logged in to launch the software.

VCOM is software provided to create a virtual serial port on your computer using the serial over IP. When you set it up properly, the network serial devices operate as though they are connected to a physical serial port.

Before you continue, make sure that your computer can communicate with the network serial device over your network. For more information, refer to the following FAQ: www.startech.com/faq/serial_ip_networking_issues.

Install software

Before you configure the VCOM software, make sure that you have downloaded and installed the latest software from the StarTech.com website. To download the driver, navigate to http://www.startech.com/Support and enter the part number.

Configure the software

When you have configured your setup so the network serial device can be pinged on the same subnet as the computer, click Search in VCOM to use the software to detect the network serial device. If the network serial device is on a different network than your computer, you can click Search by IP and enter a range of IP addresses to search by.

To configure each network serial device individually, select the device and click Configure.

You can use the VCOM software to do any of the following:

  • In Administrator, you can change the IP configuration of the unit.
  • In UART, you can configure the serial port settings. Typically, you only modify these settings if the unit is going to be a serial client in an IP serial extender setup.
  • In TCP, you can configure the client or server mode. For basic operation in VCOM, you need to set the serial device unit to Server. You do not need to configure anything to use the serial network device in UDP mode.

When you have correctly configured the network serial device for your network, you must map a COM port in VCOM to use the serial port on the network serial device. To map the COM port, complete the following:

  1. Click COM Mapping Add.
  2. Select the network serial device from the list.
  3. If necessary, change the COM number.
  4. Press OK.

The COM mapping should now appear in the list. For more information about how to verify the COM mapping in Windows, see the following FAQ: https://www.startech.com/support/faqs/technical-support?topic=serial#com-port-listing-windows.


In order for the serial device and your computer to communicate to each other, they both need to be on the same physical network and the same subnet.

To connect your serial device and your computer to the same physical network, plug both devices into the same router. 

Typically, in order for devices to be on the same subnet, the first three numbers of the IP address must match. The fourth number of the IP address must be different, as two devices cannot have the same IP address. For example, if your computer’s IP address is, then the subnet is 192.168.0.XXX. You can replace the XXX with any number, as long as it is not currently in use by another device.

To check whether or not an RS-232 serial port is working, perform an RS-232 loopback test by doing the following:

  1. If your serial port is not female, convert it by taking a female/female cable or gender changer and plugging it into the serial port.
  2. Take a metal paperclip or wire and cross pins 2 and 3. If you look closely at the female end, the pins should be numbered.
  3. Open a telnet session on the COM port number of the device that you are testing. To find out the COM port number, refer to the following FAQ: https://www.startech.com/faq/com-port-listing-windows.

Note: To open a telnet session on the COM port, you need a telnet client like PuTTY or Hyper Terminal. Windows XP comes with Hyper Terminal.

  1. When the session is open, anything you type into it you should see. The loopback test fails when you cannot see what you are typing.

If the loopback test fails, make sure that the serial cable or gender changer that you are using works and that the adapter is in the correct port. 

You can check multiple ports at the same time by opening multiple sessions, putting the loopback adapter on one port, and trying to type into each session.  When you can see what you are typing, you know that the COM port is working and you can see which port number the physical serial port is. Close the window for the port that you just tested to speed up the testing of the remaining serial ports.

For products related to this article, click here.

This device's default static IP address is

  1. Make sure that the NETRS232 is on the same network as your computer.
  2. In an Internet browser, enter the IP address of the unit. The default IP address is
  3. In the user name field, enter the user name. The default user name is admin.
  4. In the password field, enter the user name. The default user name is 00000.

You should not upgrade your device's firmware if you do not have any issues with the functionality of your device. The only time you should consider an upgrade is if you are experiencing a problem with the device, and you have confirmed that the firmware addresses this problem.  You can confirm this is the case by reviewing the documentation included with the firmware or by consulting with our Technical Support team. Incorrectly upgrading firmware can result in diminished performance so it is best to contact StarTech.com if you would like to perform this operation.

How To

To troubleshoot this issue, you can try the following:

  • Ping the serial device.
  • Connect the serial device directly to the computer and ping the device.
  • Connect to the web interface (if there is one) or connect using the included software.

Before you begin, make sure that the serial device is on the same network and subnet. For more information, see this FAQ: http://www.startech.com/faq/serial_ip_networks_and_subnets.  If the device starts with an IP address that is not on your subnet, change your IP address to match the subnet being used before you continue.

Ping the serial device

If the serial device and your computer are on the same network and subnet, try pinging the device. 

To ping the device using a computer that is running a version of Windows XP, do the following:

  1. Click Start.
  2. Click Run.
  3. Type ping <IP address> and press Enter. For example, ping

To ping the device using a computer that is running a version of Windows Vista or Windows 7, do the following:

  1. Click Start.
  2. Click Accessories.
  3. Click Command Prompt.
  4. Type ping <IP address> and press Enter. For example, ping

To ping the device using a computer that is running a version of Windows 8, do the following:

  1. Press the Windows key + X.
  2. Click Run.
  3. Type cmd and press Enter.
  4. Type ping <IP address> and press Enter. For example, ping

To ping the device using a computer that is running a version of Mac OS, do the following:

  1. Double-click the hard drive.
  2. Double-click Applications > Utilities > Network Utility.
  3. Click the Ping tab.
  4. Enter the IP address in the Please enter the network address to ping field.
  5. Enter the number of packets that you want to test with.

If you receive replies from the IP address, then you can see the device on the network and the issue is with something else.

Connect the serial device directly to the computer

To connect the serial device directly to the computer that you are troubleshooting with, complete the following:

  1. Use a crossover Ethernet cable to connect the device and the computer.
  2. Try pinging the device again.
  3. If you cannot ping the device, use a different computer, Ethernet cable, and serial device (if one is available).

Note: The second computer will need to be on the same network and subnet as the serial over IP device.

  1. If you still cannot ping the device, contact support.

Make sure that you are working in a secure environment

  1. Unplug the connection between your modem and your router. 
  2. Disable any firewalls (especially Windows Firewall), antivirus programs, and security programs that are currently running. 
  3. Try accessing the web interface (if the device has one) or try to connect using the included software.

If you still cannot connect to the device's web interface or by using the included software, contact support.

If you can access the web interface or connect using the included software, one at a time turn on your firewalls, antivirus programs, and security programs. Each time that you turn on software and cannot connect to the web interface or by using the included software, add an exception for the serial device to what you last re-enabled.

Before You Buy

Virtual COM port

One of the most common applications of a network serial device is to use it to make a standard serial device accessible on a network. To do this, you need to connect a standard serial device to the DB-9 port on the network serial device. Next you need to connect the network serial device to a TCP/IP network using an Ethernet connection, and then install software on a client machine in order to access the network serial device. The software on the client machine communicates with the network serial device and creates (maps) a virtual COM port on your computer system. The virtual COM port is identical to a physical COM port and can be used in the same way.

Serial IP extender

You can use two network serial devices to extend a serial connection over a TCP/IP network. To do this, you need to configure one serial device as a client and the other as a server. The client and server are configured to transmit and receive data to their respective IP addresses and TCP ports. The serial settings must match for all connected serial devices, including the UART on both units. Depending on the serial device that you are using, you can use the provided software or the web interface to set the configurations.

UDP to serial adapter

You can use a network serial device to translate UDP data to a standard serial connection. The serial device is configured to listen for UDP traffic from specific IP addresses and ports, and will asynchronously transmit the data out of the serial port on the device. To do this, you need to configure UART on the network serial device to match the specifications of the serial receiver.

Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(5 reviews)
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1 - 5 of 5 Reviews
(2 Stars)

Nice box, does what it is supposed to do

By: Fantic - 12/09/2014
does what it needs to do, however the manual sucks, there is no explanation at all of the possible options. Just a getting started manual is just not enough.
| Helpful?
David S, Customer Support on 09/12/2014 11:49:08
Hi Fantic, Thanks for your feedback. Sorry to hear the manual included with the NETRS232 didn’t provide all the info you were looking for - we do have a lengthier manual available under the support tab on the product page that you may find more valuable. Also, if you still need clarification, our Technical Support team would be glad to help.
(2 Stars)

Does What It Is Supposed to I Think...

By: JoSkBe - 08/10/2015
I have been testing this device in a lab scenario. I agree with the other review that the manual is a joke. It tells you how to mount the device to a rack and install the software, but nothing about what features the NETRS232 offers or what the settings/configurations do. This device has some cool features, but features that will go unused due to the lack of supporting documentation. The manual available under the support tab is the same useless manual. This is typically not an issue due to all the supporting documentation that can be found on the web, however all links I have found for this device direct me back to the original manual. Besides the manual I am having an issue when trying to gain access to a Cisco Catalyst switch. I can access the switch remotely, however the server is sending extra commands that are messing with communications. For example, ever time I enter a command it repeats the line. I can't even do a full show run, it cuts the output off after the first page due to it sending extra messages... I have tried to correct said issue via trial and error due to the lack of manual/online supporting documentation.
| Helpful?
Customer Support on 14/08/2015 10:08:04
Dear JoSkBe, Thank you for reviewing our NETRS232 Serial to IP Ethernet Device Server. We also appreciate your feedback regarding our manual; we are frequently trying to update and improve our documentation, and feedback such as this is very helpful. It seems your Cisco switch is configured in a manner so that messages are displayed on the console as soon as they are produced, often appearing in the middle of command input and output. Please try entering the “logging synchronous” global configuration command on your switch, as this will alter the display of these messages to the console. When this command is enabled, messages will only appear after you press Return. We're always here to help with our free lifetime technical support. If this didn't resolve your issue please feel free to contact us any time and be sure to reference case # 303-264607. You can also respond here and we will be sure to follow up! Customer Support StarTech.com http://www.startech.com/techsupport
(1 Stars)

avoid this product if using on a Cisco device

By: unhappy_1 - 10/23/2019
This shouldn't be this hard. Planning to return due to the "every time I enter a command it repeats the line" issue. Adding "logging synchronous" isn't practical for my application. Going to order an Opengear instead as I know they work.
| Helpful?
Matt, Customer Support on 24/10/2019 17:06:05
Product quality is very important to us and we're sorry to hear you had an unpleasant experience with our NETRS232. We'd like to speak with you about this issue as you should not see repeating lines when entering commands. Please contact us directly so that we can help fix this for you. Our Technical Advisors are available 24 hours a day, 5 days a week and we can be reached at 1-800-265-1844 or www.startech.com/chat. Matt, StarTech.com Support
(1 Stars)


By: PaulH - 06/03/2020
The manual is all about installing the setup software, called VCOM, and nothing about actually using it. I could not figure out how to use this at all. And I totally agree with the other reviewers, every word.
| Helpful?
Stacey, Customer Support on 04/06/2020 11:05:46
Hello, I’m sorry to hear about your experience with your NETRS232. We do offer free lifetime support for our products. Please feel free to reach out if you require assistance. We are available 24 hours a day, 5 days a week to provide support.
(5 Stars)

Works great, Tough to configure

By: parbo - 12/29/2021
This port server is rock solid once it is set up properly. The manual is not helpful in this area, but a little refresher on all the RS-232 settings and you should be good to go. The problem is that most all configuration options are available which makes the device flexible but also can be confusing with too many options. Also, this comes with a downloadable driver/interface, so you don't need to purchase any 3rd party software to spoof a port and connect to the device on the network.
| Helpful?
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