W&T connects
Interfaces for TCP/IP, Ethernet, RS-232, RS-485, USB, 20mA, glass and plastic fiber optic cable, http, SNMP, OPC, Modbus TCP, I/O digital, I/O analog, ISA, PCI
Data sheet:

Com-Server UL

  • Com-Server UL

One serial port to the network - transparent, fast, universal

The Com-Server UL integrates a serial device into the network to industry standard via TCP/IP Ethernet. This model is UL Listed for the American market (USA / Canada).



  • 1 x RS232/422/485 selectable
  • 1 x Ethernet 10/100BaseT
    • Autosensing/Auto-MDIX

Management and connectivity:

  • Remote configuration
    • Startup using Wutility (three clicks and you’re done), DHCP, serial
    • Web-Based-Management
    • Telnet
    • Control sockets from your own applications
  • Transparent communication
    • Windows COM Port Redirector and virtual COM ports with optional TLS-PSK encryption
    • Box-to-Box, optional TLS encrypted
    • TCP server sockets from your own applications
    • OPC server
  • Expanded protocol support
    • Modbus/TCP-Gateway for integrating serial Modbus/RTU slaves
    • FTP client / server
    • Telnet client / server
    • UDP Peer
    • SLIP
    • Wake-on-LAN

Power supply:

  • External power
    • Screw terminal 12V-24V DC

Standards & more

  • Conforms to standards both in office and industrial environments:
    • High noise resistance per EN 61000-6-2
    • Low noise emission per EN 55032:2015 + A1 Cl. B, EN 61000-3-2 & EN 61000-3-3
    • UL File No.: E254062
  • 5 year guarantee

Run modes

Windows COM Port Redirector

Install the COM Port Redirector and configure your serial program on one of the virtual COM ports - done! Regardless of whether as a replacement for missing hardware COM ports, a solution for virtual environments such as VMware, HyperV, etc. or as a simple line driver, your serial communication becomes network capable without a single line of programming and, if desired, TLS-PSK encrypted. Multipoint mode and packeting options are of course also available.
Data sheet with download link


In just a few clicks you can link 2 Com-Servers to each other logically and use an operating-system neutral, transparent and if desired TLS encrypted data tunnel through the network. Serial data are sent bi-directional and as fast as possible to the respective counterpart. Automatic reconnect functions in case of connection faults/dropouts are available as are multipoint operation and packeting options for fine tuning when using serial protocols.
To application example ...

TCP/UDP socket communication

Network programming today belongs to the standard repertoire of all programmers. Integrate your serial device simply into your own network application. Take as a TCP client control of the connection into your own hands, be contacted as a TCP server using event-driven control, or use the efficient, contactless UDP protocol. The new multipoint mode and packaging options are of course available here also.
To application example ...

NEW! Modbus/TCP-Gateway

Many devices such as energy meters, measuring transducers, frequency converters etc. have an RS232/422/485 interface and communicate via the Modbus/RTU protocol. The Com-Server integrates these devices quickly and reliably in Modbus/TCP environments.

FTP client/server

Send and archive your serial data with the FTP standard tools on most operating systems. Serial outputs from scales, barcode readers etc. or status and error messages for example from UPSs are classic applications for the use of Com-Servers as FTP server or FTP client.
To application example ...

Multipoint mode

Distribute the send data from your serial device to as many as six network stations at a time. Regardless of whether you want to archive or monitor, copies of the serial data can be retrieved on a configurable slave port. Filters for the authorized IP addresses are provided to protect against unauthorized access.

Packeting options

Received serial protocols are often sensitive to pauses in the serial data flow. To prevent such timeouts and ensure complete transmission of the datagrams in a network packet, the Com-Server++ features numerous configuration options for detecting datagram limits (Start/Stop terminators, Start + Length, etc.).

Technical data

Connections and displays:

  • Serial port:
    • 1x RS232-, RS422-, RS485 port, selectable
    • DB9 connector plug
    • 50 to 230.400 baud
    • 7,8 data bits
    • 1,2 stop bits
    • Parity No, Even, Odd, Mark, Space
    • Flow control No, RTS/CTS, Xon/Xoff
  • Serial modes:
    • RS232
    • RS422 4-wire bus master
    • RS485 4-wire bus master
    • RS485 4 wire with automatic control
    • RS485 2 wire with automatic control
  • Network:
  • Galvanic isolation:
    • Network connection min. 1500 V
  • Supply voltage:
    • DC 12V .. 24V (+/-10%)
  • Supply connection:
    • Plug-in screw terminal, 5.08mm spacing
    • Labeled "L+" and "M"
  • Current consumption:
    • max. 85mA @24V DC externally supplied
  • Displays:
    • 1 LED power
    • 1 LED status
    • 1 LED error
    • 2 LEDs network status

Housing and other data:

  • Housing:
    • Plastic compact housing for top-hat rail mount
    • 105x22x75mm (LxWxH)
  • Enclosure rating:
    • IP20
  • Weight:
    • approx. 105g
  • Ambient temperature:
    • Storage: -40...+70°C
    • Operation: 0..+60°C
  • Permissible relative humidity:
    • 5..95% RH, non-condensing
  • Operating altitude:
    • max. 2000m above sea level
  • Installation height:
    • < 2m
  • MTBF:
    • 637,767 h @25°C per MIL-HDBK-217
  • Life expectancy:
    • > 25 years at 25°C ambient temperature
  • Scope of delivery:
    • 1x Com-Server UL
    • 1x uninterruptible power supply
    • 1x safety guidelines English/French
    • 1x Quick Guide


*Net unit price for
commercial users
  • Cable and Connector Accessories

  • Mechanical Accessories

    • Mounting bracket for wall mounting
    • 58812
    • 11.20€
    • 19" DIN rail
    • 58813
    • 21.00€
    • Wall mount housing, enclosure rating IP66 / IP67
    • 11120
    • 54.00€
  • Software

    • Windows COM Port Redirector Legacy
    • 00102
    • free
    • Download
    • Windows COM Port Redirector Win 95/98/Me
    • 00101
    • free
    • Download

* Our offering is intended only for commercial users. We will be happy to refer private end customers to trading partners through whom our products can be purchased.