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Async RS232 over CATx Short-Haul Modem (SHM-NPR) - Non-powered, DB25 Male to Terminal Block

Extend async RS-232 devices beyond the 50 ft. limitation using CATx cables at data rates up to 19.2-kbps and reach distances of 5 mi. (8 km).

Item #:  Async RS232 over CATx Short-Haul Modem (SHM-NPR) - Non-powered, DB25 Male to Terminal Block


Call 1-800-667-6625 for pricing and to place order.
Please Note: Once ordered, this product cannot be cancelled or returned for credit.
Call for Pricing
*Price excludes GST

Product Features

  • Full duplex operation over 4-wire CATx
  • Data rate up to 19.2 kbps
  • Range of up to 8 km (5 miles) at 19.2 kbps over 24 AWG lines
  • Transformer isolation to protect unit
  • DCE/DTE switch for easy direct connection no special cables needed.
  • Interface powered by handshake signals no AC power required


For an interface-powered modem, the SHM-NPR really packs a punch. Forget about the 50-foot (15.2-m) RS-232 limit. This simple, plug-in SHM pushes data up to 1.2 miles (2 km) at 19.2 kbps or more than 5 miles (8 km) at 2400 bps.

This 4-screw SHM has a DB25 male connector that plugs into your terminal.

To connect your asynchronous devices to a host, use a pair of our SHM-NPRs - or a single SHM-NPR and a Short-Haul Modem-B Async (ME800A-R3). The SHM-NPR is powered from the RS-232 interface. If your device doesn't provide interface power, use the ME800A-R3 on one side of the line.

Tech Specs


Must be used in pairs or, if your device doesn't provide interface power, use the SHM-B Async (ME800A-R4) on one side of the line.

* Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 1-800-667-6625.



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The Double Diamond Warranty is our no-questions-asked warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

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.

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** Certain products may not be eligible.

What’s more, we also have a 45-day, no-questions-asked 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.


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