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Async RS232 to RS232 interface protocol converter DB9 to DB9

Communications Adapter Plus (CAP) allows you to link two mismatched asynchronous RS-232 devices for data communication by converting protocols.


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

Product Features

  • Supports word structure conversion
  • Supports flow control conversion
  • Supports Character set conversion
  • Supports data rate conversion
  • Supports transmission mode conversion
  • Connects devices that communicate from 45.5 bps all the way up to 38.4 kbps without losing data.


With the BLACK BOX® User-Programmable CAP, you can use just one User-Programmable CAP for any number of single- or multiple-character conversions. Store your programs in the 8 KB nonvolatile RAM, or upload or download them to or from your PC for storage, editing, or further downloading to as many User-Programmable CAPs as you need.

It's perfect for any application in which you need to change a character or string. Convert the control sequence between your PC and printer when you need to change fonts. Program it to remove control-character sequences inserted into wire-service feeds, such as from API—and more!

Tech Specs

CE Approval Yes
Connectors (2) DB9 F DTE
Controls Reset
Dimensions 1.8"H x 5.5"W x 8.5"D (4.6 x 14 x 21.6 cm)
Memory 32 KB RAM
Power 115 VAC, 60 Hz, 95 mA, 11 watts
Protocol Async only
Speed 45.5 bps to 38.4 kbps
Translations Maximum memory available for translations: 8 KB; Match strings or substitution strings: Up to 256 bytes each
Weight 1 lb. (0.5 kg)
This product works with:

* 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: $23.50

Extended 3 Year Warranty Available

Protect your purchase with an additional 3 Year Double Diamond™ warranty!
Cost: $46.99


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 to RS232 interface protocol converter DB9 to DB10 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.