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Black Box 1 Port Hardened Serial Server

Black Box LES421A

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Model LES421A

UPC Code: 013269153769

Provantage Code:  BABXFR5

Condition:  Factory New

  • Product Type: Device Server
  • Limited Warranty: 5 Year
  • Form Factor: Rail-mountable
  • Country of Origin: United States
  • TAA Compliant: Yes

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NetworkingNetwork DevicesTerminal and Device Servers


Black Box LES421A Specifications

    1 Port Hardened Serial Server

At a Glance

    • Access a single serial device over your Ethernet network. Software selectable for RS-232, RS-422, or RS-485.
    • Software selectable for RS-232, RS-422, or RS-485.
    • Operating Temperature -40 to +176° F (-40 to 80° C).
    • Autosensing 10-/100-Mbps Ethernet port.
    • Completely manageable through any Web browser.
    • Easily integrates a serial device into your Ethernet network.
    • UL® certified for use in Class 1, Div.2 hazardous environments.


    • 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.

Certifications & Standards

    • CE,
    • UL Class 1 Division 2
    • NEMA TS-2 rated


Product Name1 Port Hardened Serial Server
Product TypeDevice Server
Network Standard10/100Base-TX
Wireless LANNo
Ethernet TechnologyFast Ethernet
Number of Network (RJ-45) Ports1
Serial PortYes
Media Type SupportedTwisted Pair
Number of Serial Ports1
TAA CompliantYes
Form FactorRail-mountable
Environmentally FriendlyYes
Environmental CertificationWEEE
Network (RJ-45)Yes
Parallel PortNo
Network (RJ-11)No
Management PortNo
Phone Line (RJ-11)No
PoE (RJ-45) PortNo
Centronics PortNo
Country of OriginUnited States
Product ModelLES421A
Limited Warranty5 Year
Twisted Pair Cable StandardCategory 5
Supplies/Accessories for Black Box LES421A

Black Box Power Adapter, 100 240 VAC to 12 VDC, FL

Mfg Part# PS012

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Black Box Model LES421A