Black Box LES400 Series Industrial Serial Modbus Device Server - 1-Port

$372.52
$284.20 SAVE $88.32
None availableas of 07/27/2026

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Compliance, certifications and origin

  • TAA compliant
  • Origin: United States
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

About the Black Box LES400

View user manual
  • Routes Modbus traffic based on Modbus ID, and remaps conflicting Modbus IDs.
  • Offers Modbus messaging priority control, selectable by source or function code.
  • Features a built-in Web server and easy-to-use management software.
  • It can be easily integrated into most Modbus network configurations.
  • Converts ASCII to RTU as well as ASCII or RTU to Modbus TCP.
  • Features a DB9 port for serial connections.
  • Equipped with a 10-/100-Mbps port for TCP connectivity.
  • Boasts high throughput with low latency.
  • Mounts on a DIN-rail or wall. Includes a DIN mounting clip and spring.

The LES431A-R2 series Modbus gateway is a bi-directional gateway for integrating new and existing Modbus/RTU and Modbus/ASCII serial devices to operate with newer TCP/IP networked-based devices. The LES431A-R2 gateway features one independent Ethernet port and MAC address. It provides a simple and cost-effective way to bring remote management and data accessibility to thousands of older Modbus devices that cannot otherwise connect to a network. The LES431A-R2 allows users to select client or server operation mode for each serial port. It enables an Ethernet client to control serial servers, and also allows a serial client to control Ethernet servers.

Configuration can be done via Black Box Windows Configuration Utility, Telnet Console, or Web Browser so you can improve productivity and cut down on the amount of time required to troubleshoot a serial device on a factory floor or in a remote location. Configure devices, upgrade firmware, and more - all this from the comfort of your office.

Technical specifications

Technical Specifications of the Black Box LES400

General Information

General Information specifications
Manufacturer Black Box Corporation
Manufacturer Part Number LES431A-R2
Manufacturer Website Address http://www.blackbox.com
Brand Name Black Box
Product Series LES400
Product Name LES400 Series Industrial Serial Modbus Device Server - 1-Port
Product Type Device Server

Technical Information

Technical Information specifications
Connectivity Technology Wired
Data Link Protocols TCP/IP

Media & Performance

Media & Performance specifications
Media Type Supported Twisted Pair

Network & Communication

Network & Communication specifications
Ethernet Technology Fast Ethernet
Network Standard 10/100Base-T

Interfaces/Ports

Interfaces/Ports specifications
Network (RJ-45) Yes
Serial Port Yes
Management Port Yes
Total Number of Network Ports 1
Number of Network (RJ-45) Ports 1
Number of Serial Ports 1

Power Description

Power Description specifications
Input Voltage 9 V DC36 V DC
Input Voltage Range 9 V DC - 36 V DC
Power Consumption 1 W
Plug / Connector Type Terminal Block

Physical Characteristics

Physical Characteristics specifications
Form Factor DIN Rail MountableWall Mountable
Height 3.4"
Width 1.8"
Depth 0.8"
Weight (Approximate) 9.88 oz

Environmental Conditions

Environmental Conditions specifications
Minimum Operating Temperature -40°F (-40°C)
Maximum Operating Temperature 185°F (85°C)

Miscellaneous

Miscellaneous specifications
Package Contents
  • LES400 Series Industrial Serial Modbus Device Server - 1-Port
  • DIN Mounting Clip
  • Spring
Compatibility

Compatible Devices:

  • PLC
  • Meters
  • TCP Sensors
Country of Origin United States
TAA Compliant Yes

Warranty

Warranty specifications
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.