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Black Box

Black Box LES400 Series Industrial RS232/422/485 Serial Device Server

$582.94
$444.29 SAVE $138.65
5 availableas of 07/18/2026

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Should arrive by Thu, Oct 1 with free ground shipping

Compliance and certifications

  • TAA compliant
Rated excellent by our customers Read our reviews

Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

Free shipping on most items when you spend $100 or more.

Real people answer: chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.

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Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

Free shipping on most items when you spend $100 or more.

Real people answer: chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.

Overview

View user manual

Industrial RS-232/422/485 Serial Device Servers feature two independent Ethernet ports and MAC addresses to provide a redundant network mechanism that guarantees Ethernet network reliability. It is designed to connect RS-232/422/485 serial devices such as PLC, meters, sensors, and barcode readers to an IP-based Ethernet LAN.

They allow nearly any device with serial ports to connect and share an Ethernet network, while also providing various operations such as COM port redirection (Virtual COMport), TCP server, TCP client, and UDP mode. With COM port redirection mode, standard serial operation calls are transparently redirected to the servers, guaranteeing compatibility with legacy serial devices and enabling backward-compatibility with existing software. With TCP server, TCP client, and UDP modes, it ensures compatibility in network software using a standard network API. Moreover, serial devices can be made communicate with other devices via peer-to-peer, thus eliminating the need for an intermediate host PC and software programming.

Technical specifications

General Information

Manufacturer Black Box Corporation
Manufacturer Part Number LES421A-R2
Manufacturer Website Address http://www.blackbox.com
Brand Name Black Box
Product Series LES400
Product Name LES400 Series Industrial RS232/422/485 Serial Device Server
Product Type Device Server

Technical Information

Data Link Protocols TCPUDP

Media & Performance

Media Type Supported Twisted Pair

Network & Communication

Ethernet Technology Fast Ethernet
Network Standard 10/100Base-T

Interfaces/Ports

Network (RJ-45) Yes
Serial Port Yes
Total Number of Network Ports 2
Number of Network (RJ-45) Ports 2
Number of Serial Ports 1

Power Description

Input Voltage 12 V DC48 V DC
Input Voltage Range 12 V DC - 48 V DC
Power Consumption 5.20 W
Plug / Connector Type Terminal Block

Physical Characteristics

Height 1.4"
Width 5.5"
Depth 3.7"
Weight (Approximate) 15.24 oz

Environmental Conditions

Minimum Operating Temperature -40°F (-40°C)
Maximum Operating Temperature 158°F (70°C)

Miscellaneous

Compatibility

Compatible Devices:

  • PLC
  • Meters
  • Sensors
  • Barcode Readers
TAA Compliant Yes

Warranty

Limited Warranty 1 Year
Additional Warranty Information

1 Year Double Diamond™ Warranty (Standard)

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Shipping and returns

Free shipping on most items when you spend $100 or more. In-stock items ship on the next open shipment slot. The buy box above shows the live order-by countdown and the estimated arrival date.

Need to send it back? Start a return online with a Request RMA and our team will take care of you. Keep the original packaging. Items must be returned in the condition received.

Questions about shipping or returns? Chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.