1 Port RS-232/422/485 Serial over IP Ethernet Device Server

Connect to, configure and remotely manage a serial device over an IP network or the internet

Product ID: NETRS2321EEU

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  • Browser based configuration
  • Comes complete with software to configure device
  • Data transfer rates of up to 115.2 Kbps per port

The NETRS2321EEU 1 Port RS-232/422/485 Serial over IP Ethernet Device Server is the ideal solution for remotely controlling serial devices over your LAN/WAN or even the internet. Featuring user-friendly browser-based configuration of network settings, serial port line settings, UART transmit/receive buffer trigger levels and serial port flow control.

The Ethernet to RS232 converter is designed to function seamlessly with your other integrated and add-on serial ports as if they were right inside your computer. The adapter also offers remote Telnet configuration and support for IP, HTTP, ICMP and TCP network protocols, while providing data transfer rates of up to 115.2Kbps per port.

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


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

The StarTech.com Advantage

  • Access a serial device from anywhere with an IP-based connection
  • Configure your desired serial line and network settings easily with a versatile, browser-based configuration utility
  • Communicate with nearly any serial device with RS232, RS422 and RS485 protocol compatibility

Partner Numbers

  • Ingram Micro Netherlands 1619968
  • UPC 065030833981


  • Windows 8 logo
  • Windows 7 logo
Windows® 8 / 8.1 (32bit), 7 (32), Vista(32), XP(32/64)


Warranty Information Warranty 2 Years
Connector(s) 1 - Connector Type(s) DB-9 (9 pin, D-Sub)
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 0~80%RH
Hardware Ports 1
Interface Serial
Indicators 4 - LED Indicators Power, Data, LAN Link, System
Packaging Information Package Length 15,5 cm [6,1 in]
Package Width 12,6 cm [5,0 in]
Package Height 64 mm [2,5 in]
Shipping (Package) Weight 0,2 kg [0,4 lb]
Performance Max Baud Rate 115.2 Kbps
Data Bits 7, 8
Parity Even, Odd, None
Stop Bits 1, 2
Compatible Networks 10/100 Mbps
Supported Protocols RS232 / 422 / 485
Physical Characteristics Color Black
Material Plastic
Product Length 90 mm [3,5 in]
Product Width 90 mm [3,5 in]
Product Height 2,6 cm [1,0 in]
Weight of Product 105 g [3,7 oz]
Power Power Source AC Adapter Included
Input Voltage 230 AC
Input Current 0.2A
Output Voltage 9V DC
Output Current 0.5A
Center Tip Polarity Positive
Plug Type M
Software OS Compatibility Windows® 8 / 8.1 (32bit), 7 (32), Vista(32), XP(32/64)
Special Notes / Requirements Note Virtual COM port is not supported by Vista
What's in the Box 1 - Included in Package 1 port RS-232/422/485 Over IP Adapter
Power Adapter
Driver CD
Instruction Manual



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Product Support

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We are always ready to assist you with any questions you may have.

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Frequently Asked Questions

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.

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