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    BLACKBOX-TL553A-R3 RS-232 Data Sharer, 4-Port 4埠RS-232資料分享器
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    商品編號: BLACKBOX-TL553A-R3

    BLACKBOX-TL553A-R3 RS-232 Data Sharer, 4-Port 4埠RS-232資料分享器

    Cut expenses by connecting up to four RS-232 devices over one line.

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    ★★★★商品說明★★★★

    Description

    RS-232 Data Sharer, 4-Port


    Quick Facts

  3. With an RS-232 Data Sharer from Black Box, you can cut modem costs and leased-line charges by linking up to four RS-232 devices to one modem and phone line.
  4. Use a single phone line and modem to share multiple RS-232 devices.
  5. Transparent to data rates up to 64 kbps.
  6. Run sync or async half- or full-duplex.
  7. Works with popular IBM® communications protocols.
  8. Also available in 2- and 8-port versions.

    9. 　

    Further Details

    Reduce line costs in your RS-232 system by using a BLACK BOX® RS-232 Data Sharer to connect four devices to a single modem and phone line.

    The RS-232 Data Sharer features transparent operation up to 64 kbps and convenient LED monitoring. Front-panel switches enable and disable RTS on each input port.

    The Data Sharer features antistreaming circuitry to lock out any port the instant it begins to stream. On this 4-port model, hardware-prioritized scanning lets the most frequently used channels go first.

    The RS-232 Data Sharer is compatible with various popular IBM communications protocols, such as half-duplex Bisynchronous Communication and Synchronous Data Link Control (SDLC).

    This product works with:
    　
  9. Adapter Cable for IBM 3174/3274 Contoller (EHM002)
    　
  10. Standard RS-232 Low-Noise Cable (ECM25T, ECM25C)
    　
  11. CSU/DSU MS (MT132V-R2)
    Questions? Contact our FREE Tech Support.

    　

    12. Technical Specifications for RS-232 Data Sharer, 4-Port:

    Clock Source — External (from DCE)
    Contention Type — RTS/CTS
    Leads Supported — 8, 15, 17, 20, 22

    Operation —     Full- or half-duplex
    Protocol — Synchronous or asynchronous
    CE Approval — Yes
    Interface — RS-232 (master port DTE, slave ports DCE)
    Connectors — (5) DB25 F
    Indicators — (8): PWR, RTS A through RTS D, CD, CTS, RXD
    ( Power — 115 VAC, 60 Hz (230-VAC version on request)
    Size —2.9"H x 12.5"W x 11.1"D (7.4 x 31.8 x 28.2 cm)
    Weight — 5 lb. (2.3 kg)
    This product works with:
    　
  12. Adapter Cable for IBM 3174/3274 Contoller (EHM002)
    　
  13. Standard RS-232 Low-Noise Cable (ECM25T, ECM25C)
    　
  14. CSU/DSU MS (MT132V-R2)
    Questions? Contact our FREE Tech Support.

    　
    15.


    ★★★★商品規格描述★★★★

    Black Box Explains...RS-232..

    RS-232, also known as RS-232C and TIA/EIA-232-E, is a group of electrical, functional, and mechanical specifications for interfaces between computers, terminals, and modems. The RS-232 standard was developed by the Electrical Industries Association (EIA), and it defines requirements for connecting data communications equipment (DCE)—modems, converters, etc.—and data terminal equipment (DTE)—computers, controllers, etc.) devices.

    The standard, which is functionally equivalent to ITU V.24/V.28, specifies the workings of the interface, circuitry, and connector pinning. Both sync and async binary data transmission fall under RS-232. Most PCs use the RS-232 interface to transmit data to modems, and some printers even use it.

    Although RS-232 is a “standard,” you cannot necessarily expect seamless communication between two RS-232 devices. Why? Because different devices have different circuitry or pinning, and different wires may be designated to perform different functions.

    The typical RS-232 connector is DB25, but some PCs and other data communication devices have DB9 connectors. To connect 9-pin PC ports to devices with 25-pin connectors, you need a simple adapter cable. The most commonly used interface, RS-232 is ideal for transmitting data at speeds up to 20 kbps and over distances up to 50 feet (15.2 m).