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Communications Adapter Plus (CAP)


7 In Stock
Same Day Shipping (before 5PM ET)
Extended Double Diamond™ Warranty Available (3 Additional Year)

*Required field


With the Communications Adapter Plus (CAP), you can make your two mismatched async serial devices communicate by translating between two mutually unintelligible protocols.

Configure the CAP's two RS-232 ports individually via DIP switches for the greatest conversion flexibility you'll find anywhere.

The CAP converts word structure (number of data bits, parity, and stop bits), character sets (ASCII, EBCDIC, Baudot, transcode, and ticker tape), and flow control (DTR/CTS, X-ON/X-OFF, ENQ/ACK) bidirectionally between half- and/or full-duplex modes and speeds from 45.5 bps to 38.4 kbps. The flow-control buffer is 32 KB, enabling even slow machines to talk to fast ones.

Tech Specs

CE Approval No
Connectors (2) DB9 F
Controls Front-panel Reset
Dimensions 1.8"H x 5.5"W x 8.5"D (4.6 x 14 x 21.6 cm)
Flow Control Hardware, X-ON/X-OFF, ENQ/ACK, DTR/CTS
Interface RS-232, configured as DTE
Memory 8 KB EPROM, 32 KB RAM
Power 115 VAC, 60 Hz, 95 mA, 11 watts
Processor Z-80 CPU
Protocol Async only
Speed 45.5 bps to 38.4 kbps
Weight 1 lb. (0.5 kg)
This product works with:
230-VAC, 50-Hz power supply available.

* 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: $19.00

Extended 3 Year Warranty Available

Protect your purchase with an additional 3 Year Double Diamond™ warranty!
Cost: $37.99


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 Communications Adapter Plus (CAP) 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.