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900-MHz Serial Transceiver, RS-232, (2) Client/Server Units (Kit)  

Eliminate serial cable connections. Control your RS-232 devices wirelessly!


Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Highlights

  • Enables you to interconnect terminals as far as 20 miles apart!
  • Use in mobile, temporary, or fixed installations—point-to-point or multipoint.
  • Operates in the license-free 900-MHz band using FHSS technology.

  • Further Details

  • Supports RS-232 2-wire, half-duplex communications for easy integration into legacy systems.
  • Industrial-grade transceivers feature durable, die-cast enclosures to withstand temperature extremes and the elements.
  • Plug-and-play design and GUI-based configuration software enable quick setup.

  • Set up wireless links to your factory-floor devices fast with these affordable, ready-to-use transceivers from Black Box.

    Perfect for industrial, commercial, or campus applications, our 900-MHz Serial Transceivers use Frequency-Hopping Spread Spectrum (FHSS) technology to provide reliable 115.2-kbps communications. They transmit around corners, through walls, and even in environments that are typically hostile to RF signals.

    The transceiver supports links at extended distances, too—up to 20 miles (32.1 km) outdoors with clear line-of-sight. Indoors, the 900-MHz Serial Transceiver transmits up to 1500 feet (457.2 m). Just think what you can do by being able to control serial devices at these distances. Better yet, think about how much you'll save by not having the added cost of cabling. (See "Applications" below.)

    Also available is a RS-485-pinned model, as a standalone unit or as a complete kit for your client/server setups. If you prefer to make your server-side links via your PC or laptop USB port, order the 900-MHz, 200-mW USB Host Transceiver (MDR291A). Then select the individual remote RS-232 or RS-485 unit(s) suitable for your application. (NOTE: The USB version supports a maximum distance of 4 miles [6.4 km]).

    Set up your wireless system up in minutes.
    The transceiver transmits standard asynchronous RS-232 serial data to one or more client transceivers.

    The central server node supports any number of remote client nodes in point-to-point or multipoint settings. You can send communications to all devices, or you can address packets to a specific destination using the unique MAC addresses embedded in each transceiver.

    No special host software is needed, and the included GUI-based, Windows® compatible software enables you to custom-configure your transceivers to suit your specific application requirements.

    You can even create a number of subnetworks (simply by assigning unique radio addresses to the specific groups) and co-locate unique networks within the same site—without any concerns over possible interference. In fact, you can create up to 32 independent networks with the RS-232 and RS-485 900-MHz Serial Transceivers. The USB version, with even more channels, supports 56 independent networks.

    A distinct hopping pattern is provided for each channel, and an embedded RF232® protocol ensures error detection and link verification. To establish an RF link, the server-end unit emits a beacon to each client transceiver, which then informs the host that it has detected the beacon. DES encryption keeps data safe by encoding bit streams across the data link.

    Need to link devices in areas not suitable for 900-MHz communications? Then see our 2.4-GHz Serial Transceivers (MDR242A, MDR243A-KIT, MDR244A, MDR245A-KIT).

  •  Set up reliable communications between a control room and factory or lab devices. Because there's no wiring to deal with, you can move links from machine to machine in minutes.
  • Link weight scales and other measurement equipment, as well as data logging, monitoring, and control instrumentation, and upload data to your PC without having to leave your control station.
  • Establish permanent serial links to retail kiosks, point of purchase (PoP) displays, or ATMs. Unobtrusive and ultra-compact, the transceivers are easy to keep out of customers' sight.
  • Set up temporary links for trade show or other event demos in which serial devices are used. With these portable transceivers, you can shorten booth setup and tear-down time, and there are no pesky cables to snarl you—or your visitors.
  • Install less-evasive links for electronic signage. No trenches to dig, no pulling cable through a maze of conduit, no worrying about other contractors accidentally breaking your wired connection.

  • Antenna Type 1/2 wave dipole
    Channels (Maximum) 32
    Data Rate (Maximum) 115.2 kbps
    Distance (Maximum) 20 mi. (32.1 km) with clear line of sight
    Frequency Band 902-928 MHz FHSS FSK modulation (U.S.)
    Network Topologies Supported Point-to-point or point-to-multipoint (server/client architecture)
    Operating Temperature -40 to +176° F (-40 to +80° C)
    RF Data Rate 76.8 kbps (fixed)
    Security 1-Byte System ID; 56-bit DES encryption key
    Connectors Serial: (1) DB9 M (RS-232);
    Antenna: (1) RPSMA jack;
    Power: (1) barrel jack
    Indicators (4) LEDs: Power, Link, Transmit, Receive
    Power 100-240-VAC, 50-60-Hz, autosensing transformer on 6-ft. (1.8-m) U.S. cord to 7.5 VDC;
    Consumption (at 12 VDC): 400 mA TX, 40 mA RX;
    Output: 1000 mW variable;
    Input: 7-18 VDC
    Size — 1.4"H x 4.4"W x 2.7"D (3.6 x 11.2 x 6.9 cm)
    Weight — 0.3 lb. (0.2 kg)

    NOTE: Need to link devices in areas not suitable for 900-MHz communications? Then see our 2.4-GHz Serial Transceivers (MDR242A, MDR243A-KIT, MDR244A, MDR245A-KIT).

    Questions? Contact our FREE Tech Support.

    NOTE: Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 1-800-316-7107.

    Accessory: MDR291A

    900-MHz Serial Transceiver, 200-mW USB Host

    900-MHz Serial Transceiver, 200-mW USB Host

    Double Diamond Warranty
    Extended Double Diamond™ Warranty Available (3 Additional Year)

    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 900-MHz Serial Transceiver, RS-232, (2) Client/Server Units (Kit) comes with a standard 1 Year warranty 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.

    Product SKU Price Quantity
    900-MHz Serial Transceiver, RS-232, (1) Client/Server Unit MDR292A $200.95
    900-MHz Serial Transceiver, RS-485, (1) Client/Server Unit MDR294A $200.95
    900-MHz Serial Transceiver, RS-485, (2) Client/Server Units (Kit) MDR295A-KIT $386.80
    You can find this product in the following subcategory(s)

    Add to Cart

    Price: $387.80

    Quantity Available: 10




    Shipping Info

    In Stock - orders received before 5PM ET ship same day

    Weight: 2.468 lbs.
    HxWxD: 2.75 x 9 x 10 in.

    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.

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