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  • Firmware... 
  • Value Line Secure Device Server Firmware
    Firmware for the LES1101A and LES1102A (3.4.2u3)
 
  • Quick Start Guide... 
  • 1-Port Hardened Serial Server QSG
    Quick Start Guide for the LES421A (Version 1)
 

Product Data Sheets (pdf)...Enhanced TCP/IP Terminal Servers

  • Quick Start Guide... 
  • Value Line Secure Device Server (1-Port) Quick Start Guide
    Quick Start Guide for the LES1101A-R2 (Version 3)
 
  • Quick Start Guide... 
  • 1-Port 10/100 Device Server, RS-232/422/485, DB9 M
    (Version 1)
 
  • Manual... 
  • Hardened Serial Server User Manual
    User Manual for the LES421A, LES422A, & LES424A (Version 1)
 
  • Manual... 
  • 1-Port 10/100 Device Server, RS-232/422/485, DB9 M
    (Version 1)
 
  • Manual... 
  • Value Line Console Server
    (Version 3)
 

Black Box Explains...Terminal Servers

A terminal server (sometimes called a serial server) is a hardware device that enables you to connect serial devices across a network.

Terminal servers acquired their name because they were originally... more/see it nowused for long-distance connection of dumb terminals to large mainframe systems such as VAX™. Today, the name terminal server refers to a device that connects any serial device to a network, usually Ethernet. In this day of network-ready devices, terminal servers are not as common as they used to be, but they’re still frequently used for applications such as remote connection of PLCs, sensors, or automatic teller machines.

The primary advantage of terminal servers is that they save you the cost of running separate RS-232 devices. By using a network, you can connect serial devices even over very long distances—as far as your network stretches. It’s even possible to connect serial devices across the Internet. A terminal server connects the remote serial device to the network, and then another terminal server somewhere else on the network connects to the other serial device.

Terminal servers act as virtual serial ports by providing the appropriate connectors for serial data and also by grouping serial data in both directions into Ethernet TCP/IP packets. This conversion enables you to connect serial devices across Ethernet without the need for software changes.

Because terminal servers send data across a network, security is a consideration. If your network is isolated, you can get by with an inexpensive terminal server that has few or no security functions. If, however, you’re using a terminal server to make network connections across a network that’s also an Internet subnet, you should look for a terminal server that offers extensive security features. collapse

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