BLACK BOX 

BLACK BOX LES431A-R2 1-PORT RS-232/422/485 MODBUS GATEWAY

Mfg Part Number:  LES431A-R2  
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Price: $295.57
Quantity:
In Stock: 34
Last Updated: Aug 25, 2026
No Sales Tax except these states
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  • 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.

Main Specification
General Information
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
Connectivity Technology Wired
Data Link Protocols TCP/IP
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
Management Port Yes
Total Number of Network Ports 1
Number of Network (RJ-45) Ports 1
Number of Serial Ports 1
Environmental Conditions
Minimum Operating Temperature -40°F (-40°C)
Maximum Operating Temperature 185°F (85°C)
Power Description
Input Voltage 36 V DC
Input Voltage 9 V DC
Input Voltage Range 9 V DC - 36 V DC
Power Consumption 1 W
Plug/Connector Type Terminal Block
Physical Characteristics
Form Factor Wall Mountable
Form Factor DIN Rail Mountable
Height 3.4"
Width 1.8"
Depth 0.8"
Weight (Approximate) 9.88 oz
Miscellaneous
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
Limited Warranty 1 Year
Additional Warranty Information

1 Year Double Diamond™ Warranty (Standard)

Power Adapters

WARNING:: The plastic used in cable products can expose you to lead and lead components, chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information go to www.P65Warnings.ca.gov
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