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Change-of-state digital I/O card

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article image The PCI-DIO48S data acquisition card.
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THE PCI-DIO24S and PCI-DIO48S PCI data acquisition cards from Interworld Electronics are distinctive in their ability to monitor the state of all inputs. If one or more of the bits change state, a latched interrupt request can be generated.

As a result, it is not necessary to use software to continuously poll the inputs to detect a change-of-state condition.

The change-of-state interrupt is enabled by a software write command to the interrupt enable register. Once latched, the change-of-state interrupt can be cleared by a software write.

The PC-DIO24S has 24 lines, whereas the PC-DIO48S has 48 lines. This change-of-state feature is especially useful in applications involving automatic test systems, laboratory automation, robotics and machine control, security systems and energy management to name a few.

Operating system support includes DOS and Windows 95/98/NT. They use parallel data transfer to the PC and have driving indicator lights or recorders. They are programmable to either accept inputs or provide latched outputs on two groups of three, eight-bit ports.

Each I/O line is buffered and capable of sourcing 15mA or sinking 24mA of current. Tristate I/O line buffers are configured automatically by hardware logic for input or output according to the programmable peripheral interface chip control register software assignment.

To assure there are no erroneous outputs at power up until the card has been initialised by system software, the card has pull-up resistors. I/O wiring connections are through a 50-pin header on the card.

Flat ribbon cables such as the UTB (universal termination board) or 2M50FC (50 pin header breakout screw termination panel) can be used to connect these cards to termination panels.

The PCI-DIO24S and PCI-DIO48S cards use one address space, occupying sixteen consecutive register locations. The operating systems BIOS determines the resources assigned to the cards and can be located anywhere in the 0000 to FFFF hex address range. Interworld Electronics 03 9563 5011.

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