Black Box 1-800-316-7107

Helping you is our priority at Black Box.

We're committed to providing the best customer service in the industry. We're here for you, 24/7, 365.

We'll call you

A technical expert will call you shortly.

Submit Connecting call...

Call Us

Customer Sales & Service Support

Black Box Brand Product Support

IT Services & Voice Support

Send us a FAX


CAT5 DB9 Line Driver

The affordable, plug-and-play solution for controlling RS-232 equipment 3000 feet away!


Please call 877-877-2269 for a replacement product or part.
Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Features

  • Here's the practical solution for putting your RS-232 equipment where you want—up to 3000 feet away.
  • Run signals over inexpensive CAT5 cable and break the RS-232 distance limitation.
  • Plug-and-play! The driver is a pure hardware solution providing real-time data transfer with no software conflicts.


  • Use long-distance shielded CAT5 links to communicate with serial devices.
  • Control presentations remotely.
  • Transfer data between computers.
  • Ideal for a wide variety of applications.
  • Use CAT5 STP and a single power supply at either end for distances under 1000 feet; use CAT5 UTP and a power supply at each end for distances up to 3000 feet.
  • Easy installation. The driver provides full-duplex transmission and hardware handshake signals. There's no need for setup or configuration.

  • This product includes:
  • (1) local unit
  • (1) remote unit
  • (2) power supplies

  • Tech Specs

    Cable Requirement CAT5 STP cable required when using a single power supply for distances under 1000 ft. (304.8 m); CAT5 UTP used any time both power supplies are used for distances up to 3000 ft. (914.4 m)
    CE Approval Yes
    Connectors Local unit: (1) DB9 F, (1) RJ-45, (1) power jack; Remote unit: (1) DB9 M, (1) RJ-45, (1) power jack
    Distance (Maximum) 3000 ft. (914.4 m)
    Interface RS-232
    Operation Point-to-point, full-duplex
    Power Input: 100-240 VAC; Output: 12-VDC power adapter
    Size 1"H x 1.7"W x 2.9"D (2.5 x 4.3 x 7.4 cm)
    Speed (Maximum) 57.6 kbps
    Weight 0.2 lb. (0.1 kg)

    NOTE: For distances of more than 1000 feet, connect a power adapter to both the local and remote units and use CAT5 UTP cable.

    This product works with:
    • RS-232 Cable, 25-Conductor, Male/Male (ECM25C-MM, ECM25T-MM)
    • CAT5 Shielded, Solid, 100-MHz Bulk Cable, 4-Pair (EVNSL70A-1000)
    • CAT5 Unshielded, Solid, 100-MHz Bulk Cable, 4-Pair (EYN842A-1000)
    Questions? Contact our FREE Tech Support.

    * Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 877-877-2269.


    Double Diamond Warranty

    Extended 1 Year Warranty Available

    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $22.10

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $44.19


    Double Diamond™ Warranty (Standard)

    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The CAT5 DB9 Line Driver comes with a standard 3 Year Double Diamond™ Warranty (Standard) already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.