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Async RS232 Extender - DB25 Male to Coax

Extend async RS232 devices beyond the 50 ft limitation using coax and get up to 10 miles at 1.2 kbps or 1 mile at 19.2 kbps.


20 In Stock
1 Year Double Diamond™ Warranty (Standard)

*Required field

Product Features

  • Send RS-232 data farther by using coax cable.
  • Great for extending RS-232 signals in broadcasting applications.


Convert your RS-232 signal and get long-distance transmission over coax cable. With a pair of these drivers and your own coax cable, you can extend transmission distance up to 10 miles (16 km).

When speed is your priority, you can still transmit up to 1 mile (1.6 km ) at up to 19.2 kbps.

Tech Specs

Connectors (1) DB25 M with 6" (15.2-cm) cable attached; (1) built-in BNC F
Leads Supported Pins 2–8, 20
Operation Point-to-point
Power 115 VAC, 60 Hz, 28 VDC at 100 mA (230-VAC, 50-Hz version on request)
Protocol Asynchronous
Size 1.3"H x 2"W x 2.5"D (3.3 x 5.1 x 6.4 cm)
Speed 19.2 kbps at 1 mi. (1.6 km)
Product Includes:
  • Bulk Coax Cable (ETN62)Gender Changers (FA440, FA402)

  • Must be used in pairs.

    * 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 Diamond

    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 Async RS232 Extender DB25 M to Coax comes with a standard 1 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.