EtherPath® SS-1R Single Port Serial Server "Ethernet Modem"

Single Port Serial Server

Application Drawings
Application Notes
Download the Manual
How To Order

  • Serial over IP, RS-232 via IP
  • Configuration via Web Browser, Telnet, or direct connection
  • EtherModem® modem emulation technology!
  • SNMP functionality
  • Reverse Telnet, Telnet Client or Server capability
  • EtherPath RS-232 server connection over Ethernet LAN
  • RS-232 or RS-422 / RS-485(2-wire or 4-wire) interface
  • Speeds up to 230 Kbps
  • DIN-rail mount option (along with power supplies)
  • Use to access remote serial devices via LAN
  • Use on the LAN or via Routers
  • ROHS and other certifications
  • Ideal for Internet or Intranet
  • It's an economical async "Ethernet modem"
  • Allow In-band access to equipment management ports
  • Compatible with popular "port redirector" software
  • RS-232 interface supports true control lead handshaking


The EtherPath is a versatile single port serial server for Ethernet LAN/WAN's. It allows a "remote" serial port for any LAN connected workstation via telnet or port-redirector software. The EtherPath also connects any two async serial devices through a LAN, even via routers, when used in client-server or EtherModem mode. The EtherPath is often used with serial devices such as remote data collection terminals, DCB multiplexers and Access Switches, SCADA, building automation equipment, UPS's, bar code scanners, or climate control devices. It is used to connect serial management ports directly to an Ethernet network for "in-band" control of "out-of-band" devices. For this application, simply telnet to the serial management port of the connected device or use inexpensive (or free) port redirector software.

The EtherPath uses the TCP/IP protocol, allowing data connection across routed or switched LAN/WAN networks as well as connections on a local network.

The EtherPath supports serial interface speeds up to 230 Kbps. The EtherPath can automatically open connections when it powers up (Nailed-Up mode), eliminating the need for a manual request. Full flow controls (RTS/CTS) and Xon/Xoff are also supported.

The EtherModem mode allows a serial device to treat the EtherPath as if it was a true "Ethernet Modem", using normal modem control and response strings such as "ATD", "ATE", +++, etc. This allows a single EtherPath to connect to multiple remote servers (either EtherPaths or telnet servers) under control of the attached serial device.

Reverse Telnet (Telnet Client) mode allows telnet functionality to be added to serial devices.

If in point to point client server mode and the "nailed" connection is lost, the EtherPath automatically reconnects when a path again becomes available.

The EtherPath can be managed directly through its physical port as well as remotely from other network locations. Remote configuration is supported using TCP/IP (telnet) or with the easy web browser interface. Security lists are provided for management security.

Telnet to the EtherPath or use COM: port redirector software on UNIX (SCO, FreeBSD, AIX, LINUX) or Windows machines, making the EtherPath a remote serial port for a PC or a work station. The EtherPath is an ideal remote access device for maintaining and controlling remote devices with RS-232 serial control ports. When used with the DCB Access Switch, the single serial port can be expanded to 152 ports including remote AC power control.

If you want to use the EtherPath as a remote COM: port on a Windows PC, DCB recommends the inexpensive Serial/IP port redirector software for Windows machines. It's produced by Tactical Software and a 30 day demo can be downloaded from this link. After you've tried it, you can purchase the permanent license on-line.

Learn more about port redirection by reading this application note... "Using the EtherPath with PC and Unix Port Redirection". It details using a variety of methods to communicate with the EtherPath from Windows and most UNIX machines.

OEM manufacturers can design the EtherPath into their products or use it as an add-on method to gain ethernet connectivity. DCB supplies the EtherPath to many other companies and can provide custom firmware for specific applications.

If you need UDP communications to a similar device, or wish to use a similar device in a multi-drop or polled environment (quite handy for SCADA protocols such as Modbus, DNP3, etc. ), then check out the EtherPath's brother, the EtherPoll.. It is similar hardware with firmware that uses UDP communications to multiple remote devices... a great ethernet replacement for multi-drop modems.



  • Modes Supported:
    • Nailed-Up Client/Server (transparent RS-232 connection upon power-up)
    • Telnet Server (any port) (or Raw TCP/IP sockets)
    • Telnet Client (any port), Reverse Telnet
    • EtherModem (point-to-multiple point)
  • Configuration Methods
    • Any Web Browser
    • Telnet Menu Interface
    • Direct Connection Menu Interface
  • EtherModem technology, treat it like an "ethernet modem" with AT dial strings, etc.
  • SNMP agent functionality included (Link to MIB here )
  • RS-232 serial port, DTE interface or RS-422/RS-485(2-wire or 4-wire)
  • DE-9 RS-232 male serial DTE (Commonly known as a PC COM: port DB-9) port
  • Serial speeds from 300 bps to 230,000 bps
  • RJ45 10/100BaseT Ethernet, autoselected
  • Transport protocol is routable TCP/IP
  • Set up via web browser, telnet command line interface or the serial port
  • Works through any TCP/IP link... satellite, ISP, routers, wireless, broadband, etc.
  • Supports forced connections, required for connecting DCB multiplexers via LANs and routers
  • Certifications
    • RoHS, FCC, CE, and others
  • Front Panel Indicators

    Serial Port Activity LED
    LAN Activity LED
    LAN Status LED


    Press button to select configuration mode

    Data Port

    Interface: RS-232, V.24, or RS-422/485(4-wire/2-wire), speeds up to 230,000 bps
    Connector: DE-9P RS-232 (commonly known as a DB-9 PC connector)

    Lan Connection

    Interface: 10BaseT or 100BaseT, autoselect or forced


    • 5mm x 78mm x 28 mm (W x H x D) 2.5 in x 3.25 in x 1.25 in (approximate)
    • 1 lb
    • 5-30 volt DC (external power supplies available for 110 VAC, 220 VAC, 48VDC, 125VDC and others)
    • 350ma @ 5 VDC, 200ma @ 12 VDC
    • Operating Temperature: -40 to +70C with DC power supplies. -40 to +50C with 110VAC power supply. Optional AC power supplies available with extended temperature range.

    Front view of DCB EtherPath ROHS
    RS-232 Connector

    Rear view of DCB EtherPath ROHS
    LAN Connectors

    Application Drawings




    Download the User's Manual by clicking here.

    Application Notes

    These applications notes illustrate real-world applications of the EtherPath and help you apply the unit to solve your data communication problem.
    Quick Start Guide - Nailed-up connection.
    Step-by-step instructions on configuring two Etherpath units to communicate and transfer serial data through the LAN using a "nailed-up connection" on the work bench. We urge all new users to first set up a pair this way so you know what to expect in the field.Download the note.
    Troubleshooting the Quick Start Configuration
    How to diagnose the problem if you have trouble making the units work after configuring them according to the quick start guide above. Very few people need this note, but here are the hints just in case. .Download the note.
    Quick Start Guide - Telnet Server Only.
    Step-by-step instructions on configuring an Etherpath unit to communicate and transfer serial data through the LAN functioning as a telnet server on the work bench. We urge all new telnet server application users to first set up a pair this way so you know what to expect in the field.Download the note.
    Troubleshooting the Quick Start Telnet Server Configuration
    How to diagnose the problem if you have trouble making the units work after configuring them according to the quick start guide above. Very few people need this note, but here are the hints just in case. .Download the note.
    Port Redirection and the EtherPath
    "Using the EtherPath with Unix and PC Port Redirection" is an article that discusses the options available when using port redirection software and custom-written software to access remote serial ports with the EtherPath serial device server. Sources of sample programs and free port redirector software are provided. Read the article!
    Embedded Server Technology to Connect RS232 Devices
    "Globally Serial: Extending the Reach of your Serial Devices Around the World" is an article that recently appeared in information technology trade journals. This article discusses the use of DCB's EtherPath external device servers and how they are used to connect RS-232 serial devices using a wide area ethernet network. Read the article!
    EtherPath vs. the EtherPoll, Selecting the best product for your application
    The EtherPath shines at point-to-point applications using TCP/IP. The EtherPoll is used for both point-to-point and point-to-multipoint applications with UDP/IP. This applications note helps you select the one that best fits your needs. Read the article!

    How to Order?   Buy it on-line or call toll free 800-432-2638!

    Item Number Description Price Buy Now!
    SS-1R EtherPath® Single Port Ethernet Serial Server (5-30VDC and 120 VAC power supply) $295 Qty:
    SI Serial/IP Port Redirector Software for Windows
    (Order from Tactical Software)
    9501033 Optional 36-72 VDC Input Power Supply $ 75 Qty:
    9501081 Optional 125 VDC Input Power Supply $ 125 Qty:
    9902090 Optional DIN rail mounting clips $ 5 Qty:

    Serial/IP is a trademark of Tactical Software, LLC

    Data Comm for Business Inc.
    2949 County Road 1000 E
    Dewey, Il 61840
    Voice: 217-897-6600
    Toll Free: 800-4-DCB-NET
    Toll Free: 800-432-2638
    Email: Contact Page
    Fax: 217-897-8023
    All DCB web pages copyright ©1995- Data Comm for Business, All rights reserved.
    EtherPath®, EtherSeries®, EtherPoll®, EtherBridge® and EtherModem® are Registered Trademarks of Data Comm for Business, Inc.