External Device Server

  • Connects multiple devices to a single network
  • Cost-efficient flexible solution to networking serial devices
  • (4) DB9M, RS-232, RS-422, and RS-485 serial ports
  • 10/100Base-T Ethernet interface serial ports
  • Dedicated and character-initiated host connections
  • Easy management from any browser
  • Applications: Industrial Automation, Security Systems, Retail Point of Sale, UPS Management, Bar Code Readers, Medical Instruments

Overview for MSS4

Remotely Monitor, Manage, and Share Connected Devices Over a Network or the Internet

The MSS4 is a flexible, four-port device server that empowers isolated intelligent devices to leverage their serial interfaces and communicate over Ethernet or Internet networks using reliable network protocols.

The MSS4 is a robust, cost-effective, high quality solution for serial to Ethernet connectivity. It employs proven Lantronix technology to networkenable products used in diverse markets such as:

  • Retail/Point of Sale
  • Medical Instrumentation
  • Commercial Buildings
  • Security Systems
  • Manufacturing/Automation

Virtually any asynchronous serial device can be accessed over a network through the MSS4’s 10/100Base-T Ethernet network interface, giving you complete control and monitoring capabilities.

The four serial ports independently accommodate RS-232, RS-422, or RS-485 devices – making it an ideal solution for a variety of applications and environments. The MSS4 is easy to configure and provides advanced serial data handling features required for sensitive data communication applications.

The MSS4 allows easy management and setup from virtually anywhere using a standard browser. The included Redirection software simplifies your integration process by extending the functionality of your Com Port based Windows® applications. The MSS4 can also be managed using Telnet, SNMP, the serial port or Lantronix supplied Windows® GUI application EzWebCon™.

Features & Specifications for MSS4

Supported Devices

  • RS-232/RS-422/RS-485 asynchronous serial devices



Network Interface

  • 1 10/100 RJ45

Serial Interface

  • 4 DB9M DTE ports

Serial Speeds

  • 300bps to 230Kbps

Flow Control

  • Software: XON/XOFF
  • Hardware: CTS/RTS

Modem Controls



  • Telnet
  • Serial Port
  • DHCP
  • SNMP
  • Internal Web Server
  • EZWebCon™ Management Software


  • Flash ROM, downloadable from:
    • EZWebCon™
    • TCP/IP host (TFTP)

Diagnostic LEDs

  • Link (10/100)
  • OK
  • Serial ports 1 – 4 active


  • Ethernet version 2.0/IEEE 802.3
  • Ethernet version 2/IEEE
  • 802.3/IEEE 802.3u


  • 9-30VDC
  • 1.84A max. @ 12VDC with all options (12VDC universal adapter included)


  • Operating: 5° to 50° C (41° to 122°F)
  • Storage: -40° to 66° C (-40° to 151°F)


  • Dimensions (L x W x H): 13.9 x 23.6 x 3.3 cm (5.5 x 9.3 x 1.3 in)
  • Weight: 0.51kg (1 lb 2 oz)

Shipping Dimensions

  • Dimensions (L x W x H): 20.9 x 27.9 x 13.9 cm (8.25 x 11 x 5.5 in)
  • Weight: 0.59kg (1 lb.5 oz)


  • FCC (A), C/UL, TUV, CE (A)

Docs & Downloads for MSS4

Firmware Downloads

MSS4 Firmware
Configuration Utility - EZWebCon v3.0/4

Order Information & Part Numbers for MSS4

Lantronix Online Store (U.S.A., Canada, Mexico, Europe)

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  • Call (800) 422-7055 to speak with a Lantronix sales representative in North America.
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  • Find a Lantronix Partner – Lantronix products are available from a variety of leading technology vendors.
Part Number Name Description Order Now

0/100 Device Server,4 DB9M RS-232/RS-485 serial port, 1 10/100 RJ45 networking port, diagnostic LEDs, external 100-240VAC wall cube power supply

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