BLACKBOX-IC600C RS-422/485 ISA Cards, with 4 IRQs 1埠RS-422/485 ISA介面卡, 4 IRQs

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BLACKBOX-IC600C RS-422/485 ISA Cards, with 4 IRQs 1埠RS-422/485 ISA介面卡, 4 IRQs

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商品編號: BLACKBOX-IC600C

BLACKBOX-IC600C RS-422/485 ISA Cards, with 4 IRQs 1埠RS-422/485 ISA介面卡, 4 IRQs

Give a 460.8-kbps boost to your RS-422/485 data communications!

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IC057C	1埠RS-422/485 ISA介面卡, 11 IRQs	RS-422/485 ISA Cards, with 11 IRQs and Autoenable

★★★★商品說明★★★★

Description

RS-422/485 ISA Cards, with 4 IRQs, 2-Port, 16550 UART

Quick Facts

Connect additional RS-422 or RS-485 devices via your ISA bus.

All cards eliminate disruptive line noise. The RS-422 and RS-485 interfaces measure the difference in electrical signals and keep this difference constant.

Further Details

Cards with optical isolation are available.

Support both 2- and 4-wire operation and distances up to 4000 feet (1219.2 m).

Card with autoenable circuit (IC057C) enables the RS-485 transmitter during character transmission.

Choose from cards with 4 or 11 IRQs.

Cards are COM-1 through COM-4 addressable and also feature nonstandard I/O addressing.

Technical Specifications for RS-422/485 ISA Cards, with 4 IRQs:

Buffer — 16-byte FIFO
Distance (Maximum) — 4000 ft. (1219.2 m)
Operating Systems Supported — Windows®, Linux®, QNX
Operation — 2 or 4 wires
Optical Isolation — IC057C: 500 VDC
Protocol — Async
Speed (Maximum) —115.2 kbps
CE Approval — Yes
Connectors — (2) DB9 M
　

These products work with:
• DB25 Serial Null-Modem Cable (BC00501)
• Modular Thumbscrew Adapter Kits (FA771, FA756)
Questions? Contact our FREE Tech Support.
　

★★★★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)