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  • Manual... 
  • RS-232 to RS-485/422 Bidirectional Converter Plus Rackmount Card
    Installation and User Guide (Apr-02)
 

Product Data Sheets (pdf)...ISA Cards

  • Manual... 
  • Async RS-232↔RS-485 Interface Converter Manual
    Manual for the IC620A-F, IC620A-M, IC623A-F, IC623A-M, IC624A-F, and IC624A-M (Version 2)
 

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... more/see it nowshare 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. collapse


Product Data Sheets (pdf)...Balun Mate


Product Data Sheets (pdf)...Communications Adapter Plus (CAP) User-Programmable Communications Adapter Plus (CAP)


Product Data Sheets (pdf)...PCI Cards


Black Box Explains...How computer speeds are enhanced with PCI buses and UARTs.

The Peripheral Component Interconnect (PCI®) Bus enhances both speed and throughput. The PCI Local Bus is a high-performance bus that provides a processor-independent data path between the CPU and high-speed... more/see it nowperipherals. PCI is a robust interconnect interface designed specifically to accommodate multiple high-performance peripherals for graphics, full-motion video, SCSI, and LANs.

UARTs (Universal Asynchronous Receiver/ Transmitters) are integrated circuits that convert bytes from the computer bus into serial bits for transmission. By providing surplus memory in a buffer, UARTs help your applications overcome the factors that slow down your system. collapse


Product Data Sheets (pdf)...G.703 75-to 100120 Ohm Adapters


Product Data Sheets (pdf)...Async RS-232 to RS-422 Interface Converters

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