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Non-Powered Modem-Sharing Device (NPMS)

Eliminate the cost of extra modems and communication ports.


Please call 877-877-2269 for a replacement product or part.

Product Features

  • Active port contention.
  • Derives power from the data and handshaking signals of the attached RS-232 device.
  • Transparent in sync or async environments.
  • Straightforward and simple installation with no tuning or strapping required.


This data-sharing device is more than just a splitter. It gives you active port contention, draws power from the RS-232 line, is data-transparent in sync or async environments, and supports speeds up to 19.2 kbps.

The Non-Powered Modem-Sharing Device (NPMS) shares one modem over two terminals. There's nothing to set— just make the connection and start sharing!

Tech Specs

CE Approval Yes
Connectors (1) DB25 M (modem), (2) DB25 F (port)
Contention Type Control (RTS) signal
Interface RS-232
Size 1"H x 2"W x 5"D (2.5 x 5.1 x 12.7 cm)
Weight 0.3 lb. (0.1 kg)
This product works with:
• Extended-Distance Data Cable (EDN16T, EDN16C)
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 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 Non-Powered Modem-Sharing Device (NPMS) comes with a standard None 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.