1 Port RS232 Serial Ethernet Device Server - PoE Power Over Ethernet

Connect to, configure and remotely manage an RS-232 serial device over an IP network

Produkt ID: NETRS2321POE

  • Supports standard Ethernet or Power over Ethernet (POE)
  • Supports UDP, IP, TCP, ICMP, HTTP, DHCP and ARP-Ping protocols
  • Wall mountable
Ditt pris
€219,99 EUR excl. VAT
€274,99 EUR incl. VAT

The NETRS2321POE 1 Port RS232 Serial Ethernet Device Server - PoE (Power Over Ethernet) allows you to install your RS232 devices anywhere on your TCP/IP Ethernet WAN/LAN, and access them as if they were right beside you - even over the Internet!

The Serial Device Server is designed to function seamlessly with your other integrated and add-on serial ports as if they were right inside your computer. Perfect for industrial automation, security, Point of Sale, or any long-range serial application, delivering reliable performance in any environment.

The Ethernet/serial device server supports PoE (Power over Ethernet) when connected to a PoE compliant device - eliminating the need for an external power supply and outlet, and making it easier to situate the device server as needed.

Backed by a StarTech.com 2-year warranty and free lifetime technical support.


  • Manufacturing (CNC machinery, process control equipment, bar code scanners, serial printers)
  • Security (UPS control, access key panels, video cameras, card readers)
  • Environmental Control (lighting, temperature, clocks)
  • POS (credit/debit card readers, receipt printers, bar code scanners, cash registers, scales)
  • Hospital (monitoring equipment, nurses' stations)
  • Hotel Front Desk (serial printers, bar code scanners, keyboard, mouse, receipt printer, credit/debit card reader)
  • Hospitality/Restaurant (credit card/debit card reader, serial printers)

Fördelarna med StarTech.com

  • PoE support gives you the freedom to situate your serial device where it is needed even when no power outlet is available
  • IP-based connection to your serial devices allows remote administration from anywhere; even over the Internet
  • Remotely connect to multiple NETRS2321POE units with a single PC for simple and efficient management of devices from a single location


  • Ingram Micro Sweden V933059
  • UPC 065030834162



Warranty Information Warranty 2 Years
Förpackning Package Height 70 mm [2,8 in]
Package Length 19,2 cm [7,6 in]
Fraktvikt (förpackning) 963 g [34,0 oz]
Package Width 29,6 cm [11,7 in]
Hårdvara Industristandarder IEEE 802.3af Power-over-Ethernet
Indikatorer 3 - LED-indikatorer Heartbeat, Link/Activity, 10/100 Mbps
Kontakt(er) 1 - Kontakttyp(er) DB-9 (9 pin, D-Sub)
Miljö Drifttemperatur 0°C to 55°C (32°F to 131°F)
Förvaringstemperatur -20°C to 85°C (-4°F to 185°F)
Luftfuktighet 5~95% RH
Mjukvara OS-kompatibilitet Windows® Vista (32), XP (32), 2000
Prestanda Maximal dataöverföringshastighet 115.2Kbps
Databitar 6, 7, 8
Stoppbitar 1, 2
Medeltid mellan fel (MTBF) 233,403 Hours
Stödda protokoll UDP, IP, TCP, ICMP, HTTP, DHCP, ARP-Ping
Ström Power Source AC Adapter Included
Inspänning 100 - 240 AC
Inström 0.3 A
Utspänning 12V DC
Utström 0.1A
Polaritet på mittpol Positive
Kontakttyp M
Strömförbrukning 1.2
Särskilda anmärkningar/krav Patents and Licenses The following patents are licensed for this product. This list might not be all inclusive.
• United States Patent No. 5,406,260 (expired)
• United States Patent No. 6,650,622
• United States Patent No. 7,457,250
• United States Patent No. 8,155,012
• United States Patent No. 8,902,760
• United States Patent No. 8,942,107
• United States Patent No. 9,019,838
• United States Patent No. 9,049,019
• United States Patent Application No. 14/695,456
• United States Patent Application No. 14/726,940
Utseende Produktvikt 259 g [9,1 oz]
Färg Black
Kabinettyp Aluminum
Produktlängd 10,7 cm [4,2 in]
Produktbredd 66,3 mm [2,6 in]
Produkthöjd 2,5 cm [1,0 in]
Vad det är i lådan 1 - Ingår i paketet Industrial Serial over IP Device Server
Universal Power Adapter (NA/UK/EU)
Instruction Manual



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Prata med en rådgivare.

Vi är alltid redo att hjälpa dig med alla dina frågor.

Direktchatt (opens in new window)


Inbyggd programvara




Prata med en rådgivare.

Vi är alltid redo att hjälpa dig med alla dina frågor.

Direktchatt (opens in new window)

Vanliga frågor


Installation for the NETRS2321POE involves software installation, as well as the setup of a virtual serial port using the software.

To install the software, complete the following:

  1. Download the software from www.startech.com/NETRS2321POE#dnlds.
  2. Right-click the folder.
  3. Click Extract all.

Once the software is extracted, it will have to be run to first configure the device. To do this, complete the following:

  1. Connect the NETRS2321POE to your computer or network using an Ethernet cable.
  2. Connect it to a power source.
  3. Open the extracted folder from Step 3.
  4. Open the IP-Search-Utility folder.
  5. Right-click Etm.exe.
  6. Click Run as administrator.

The software should locate the NETRS2321POE. If it is required to change the IP address of the device, perform steps 6-9. If not, proceed to step 10.

  1. Click Config.
  2. Click IP Address.
  3. Enter the preferred IP address.
  4. Click OK.

Note: Ensure that the IP address given matches your network. If the device is connected directly to your PC, disconnect it and then connect it to your network. Ensure that you can still see the device by refreshing the Ethernet Manager.

  1. Click Config.
  2. Click Device Settings to edit the port settings.

Note: By default, there is no password required to log in.

  1. Click Login.
  2. Enter any required port settings, if necessary.

Note: The Socket port of serial I/O number is needed for mapping the COM port to the PC, so this should be noted.

  1. Click Update.

After the device is configured, a different piece of software will need to be run to create the virtual COM port. To do this, complete the following:

  1. Open the Virtual-Com folder from the extracted zip file.
  2. Open the appropriate folder for your operating system.
  3. Right-click VSerPortConsole.exe.
  4. Click Run as administrator.
  5. Right-click in the window.
  6. Click add port.

Note: The default values can be used, or the COM port can be changed if a specific one is needed.

  1. Right-click on the port.
  2. Click add net.
  3. Enter the IP address and socket port of the NETRS2321POE.
  4. Click OK.


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.

This device's default static IP address is

  1. Säkerställ att NETRS2321POE är i samma nätverk som din dator.
  2. I en internetwebbläsare anges enhetens IP-adress. Som standard är IP-adressen
  3. Ange lösenordet i fältet för lösenord. Det finns inget standardlösenord.

Press the Restore Default button on the device. This will immediately restore the unit to its default settings.

Du bör inte uppgradera enhetens inbyggda programvara om du inte har några problem med enhetens funktioner. Du behöver bara uppgradera om du har problem med enheten och är säker på att problemet är den inbyggda programvaran.  Du kan bekräfta detta genom att läsa igenom den medföljande dokumentationen eller kontakta vår tekniska avdelning. Felaktig uppgradering av inbyggd programvara kan resultera i minskade prestanda så vi rekommenderar att du kontaktar StarTech.com först.

Hur man

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.
* Produkters utseende och specifikationer kan komma att ändras utan förvarning.
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