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    BLACKBOX-IC117A-R2 PCMCIA Serial I/O Adapter, Single-Port, Sync RS-232/422/530/V.35, Zilog™ 85233 SCC 1埠同步RS-232/422/530/V.35, Zilog™ 85233 SCC PCMCIA介面卡
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    商品編號: BLACKBOX-IC117A-R2

    BLACKBOX-IC117A-R2 PCMCIA Serial I/O Adapter, Single-Port, Sync RS-232/422/530/V.35, Zilog™ 85233 SCC 1埠同步RS-232/422/530/V.35, Zilog™ 85233 SCC PCMCIA介面卡

    Get more mobility with an extra comm port

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    ★★★★商品說明★★★★

    Description

    PCMCIA Serial I/O Adapter, Single-Port, Sync RS-232/422/530/V.35, Zilog™ 85233 SCC


    Quick Facts

  3. Has one Zilog™ 85233 serial communication controller.
  4. Add a serial port to your laptop computer and really go to work.
  5. Control/automate RS-232 or RS-422/485 devices without being tied to your desk.
  6. RS-232 distances up to 50 feet (15.2 m); RS-422/485 to 4000 feet (1219.2 m).

    7. 　

    Further Details

  7. Use this card for protocols such as SDLC, HDLC, X.25, and for synchronous communications. Note that some sync protocols require programming through APIs.
  8. Complies fully with PCMCIA Type II specs.
  9. Supports all major card and socket services software.
  10. Drivers are included for Windows® 95/98/Me/XP, Windows NT®, and Windows 2000.
  11. Also work with all other PCMCIA-compatible operating systems, including DOS, Linux®, and QNX.
  12. Includes (1) DB25 male to PCMCIA Type II dongle interface cable.
  13. Cable has locking connectors to prevent accidental discounts.

  14. 　

    15. Technical Specifications for PCMCIA Serial I/O Adapter, Single-Port, Sync RS-232/422/530/V.35, Zilog™ 85233 SCC:

    Communications Chip — (1) Zilog 85233 SCC
    Hardware Requirements — PC, notebook, or laptop with a PCMCIA Type II slot and a 3.5" floppy drive
    Protocol — Sync
    Speed — Up to 200 kbps
    CE Approval — Yes
    Connectors — Interface cable (included): DB25 M to PCMCIA Type II dongle
    Size — PCMCIA Type II

    　


    ★★★★商品規格描述★★★★

    Black Box Explains...IRQs, COM Ports, and Windows.

    Windows® 95 normally requires each serial port to have its own unique Interrupt Request Line (IRQ). However, if you use a third-party communications driver that supports IRQ sharing, you can share interrupts. Unfortunately, data throughput will not be as high as with single interrupt port configurations.

    With Windows NT®, you can share interrupts across multiple ports as long as the serial ports have an Interrupt Status Port (ISP) built into the card.

    The Interrupt Service Routine, a software routine that services interrupts and requests processor time, reads the ISP and is immmediately directed to the port that has an interrupt pending. Compared to the polling method used if the serial ports don’t have an ISP, this feature can determine which port generated the interrupt up to four times more efficiently—and it almost eliminates the risk of lost data. Windows NT supports the ISP by enabling the user to configure the registry to match the card’s settings. Black Box models IC102C-R3, IC058C, and IC112C-R3 all have ISPs and come with a Windows NT setup utility to simplify installation and configuration.

    If your serial port doesn’t have an ISP, the Interrupt Service Routine has to poll each port separately to determine which port generated the interrupt.
    Black Box Explains...UARTs at a glance..

    Universal Asynchronous Receiver/Transmitters (UARTs) are integrated circuits that convert bytes from the computer bus into serial bits for transmission. By providing surplus memory in a buffer, UARTs help applications overcome the factors that can hinder system performance, providing maximum throughput to high-performance peripherals without slowing down CPUs.

    Early UARTs such as 8250 and 16450 did not include buffering (RAM or memory). With the advent of higher-speed devices, the need for UARTs that could handle more data became critical. The first buffered UART was the 16550, which incorporates a 16-byte First In First Out (FIFO) buffer and provides greater throughput than its predecessors.

    Manufacturers have been developing enhanced UARTs that continue to increase performance standards. These faster chips provide improvements such as larger buffers and increased speeds. Here are the rates of today’s common UARTs:

    UART FIFO Buffer Rate Supported
    16550 16-byte 115.2 kbps
    16554 16-byte 115.2 kbps
    16650 32-byte 460.8 kbps (burst rate)
    16654 64-byte 460.8 kbps (burst rate)
    16750 64-byte 460.8 kbps (burst rate)
    16850 128-byte 460.8 kbps (sustained rate)
    16854 128-byte 460.8 kbps (sustained rate)