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Black Box Corporation
LES421A
$702.82
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Manufacturer Black Box Corporation
Manufacturer Part Number LES421A
Manufacturer Website Address https://www.blackbox.com
Brand Name Black Box
Product Model LES421A
Product Name 1-Port Hardened Serial Server
Marketing Information 

  • Enables you to monitor a serial industrial device from your office.
  • Configure a device, troubleshoot, upgrade firmware, and more.
  • Rugged design for operation in a wide temperature range.
  • UL® Listed for use in Class 1 Division 2 hazardous areas.
  • NEMA TS-2 rated for use in transportation applications.
  • Offers direct IP, virtual COM port, or paired modes of operation.
  • Features a DB9 port and terminal block for serial connections.
  • Equipped with a 10-/100-Mbps port for LAN/WAN connectivity.
  • Built-in Web server for browser-based management.
  • Includes easy-to-use configuration software.
  • Boasts high throughput with low latency.
  • Slim IP30 enclosure saves on DIN rail space.

  • Communicate easily with an RS-232, RS-422, or RS-485 serial device via your LAN or WAN with the rugged and compact 1-Port Hardened Serial Server from Black Box.

    It's just what you need to improve productivity and cut down on the amount of time required to configure or troubleshoot a serial device located on a factory floor or in a remote location.

    Eliminate visits to a distant site just to make a minor change to a configuration. You can do all this from the comfort of your office using an Ethernet LAN or WAN connection, or even from home via a standard Web connection.

    A simple-to-install, user-friendly Web configuration software application enables programming through a browser connection. No time-consuming setup is required.

    Set it up to operate in one of three modes:
  • In Direct IP Mode, you use TCP/IP or UDP/IP to communicate directly with the serial device.
  • In Virtual COM Mode, you can communicate with the device via your network just as if the device was connected to a physical COM port.
  • In Paired Mode, mUL®tiple serial devices can communicate with one another using network tunneling (more than one 1-Port Hardened Serial Server is required).

  • The Hardened Serial Server has a standard DB9 serial port and a removable terminal block for the RS-232, RS-422, or RS-485 device connection, and an autodetecting 10BASE-T/100BASE-TX port for a CAT5 connection to your Ethernet network.

    Plus, for reliable operation, the serial server offers a heartbeat connection, which detects any TCP communication failures and sends out signals every five seconds until the system is reconnected.


    Product Type Device Server
    Media Type Supported Twisted Pair
    Twisted Pair Cable Standard Category 5
    Wireless LAN No
    Ethernet Technology Fast Ethernet
    Network Standard 10/100Base-TX
    Network (RJ-45) Yes
    Phone Line (RJ-11) No
    Network (RJ-11) No
    USB No
    Serial Port Yes
    Parallel Port No
    Centronics Port No
    Management Port No
    PoE (RJ-45) Port No
    Number of Network (RJ-45) Ports 1
    Number of Serial Ports 1
    Form Factor Rail-mountable
    Height 1.20" (30.48 mm)
    Width 3.20" (81.28 mm)
    Depth 4.70" (119.38 mm)
    Weight (Approximate) 136.1 g
    Certifications & Standards 
    • CE,
    • UL Class 1 Division 2
    • NEMA TS-2 rated

    Environmentally Friendly Yes
    Country of Origin United States
    TAA Compliant Yes
    Limited Warranty 5 Year