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


USB to RS-232 Opto-Isolator

Connect an RS-232 device to a USB port and gain isolation from voltage spikes and ground loops.


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

Product Features

  • Connects an RS-232 device to a PC's USB port.
  • Provides 2000-volt RMS isolation against ground loops.
  • Protect your computer and RS-232 devices from voltage spikes and ground loops.


This compact opto-isolator enables you to attach an RS-232 device to a USB port and gain isolation from voltage spikes and ground loops. It doesn't require PCI or ISA slots, or IRQs. Using an optional USB Type A–Type B cable, simply plug the opto-isolator into the USB port and Windows will configure the device as an additional COM port. It’s compatible with Windows 98/98 SE/Me, Windows 2000, and Windows XP applications.

Tech Specs

cUL 0
UL 0
Approvals CE
Connectors (1) DB9 M, (1) USB Type B
Dimensions 0.9"H x 3"W x 1.7"D (2.3 x 7.6 x 4.3 cm)
Indicators LEDs: (1) RD, (1) TD
Isolation 2000 volts RMS
Operating Systems Supported Windows 98/98 SE/Me, Windows 2000, Windows XP
Power From the USB bus
Standard USB Revision 1.1

To make host PC connections, order:
• USB Version 1.1 Cable, Type A Male–Type B Male Plugs
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: $15.80

Extended 3 Year Warranty Available

Protect your purchase with an additional 3 Year Double Diamond™ warranty!
Cost: $31.59


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 USB to RS-232 Opto-Isolator comes with a standard 2 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.