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PCI Express 48-Channel Digital I/O Card with Change of State Detection

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PCI Express 48-Channel Digital I/O Card with Change of State Detection

A 48-channel PCI Express (PCIe) card has been designed for use in a variety of digital I/O applications. The PCIe-DIO-48S is compatible with 8255 PPI (mode 0), making it easy to program and migrate from other Acces PCI digital I/O cards. The card features a x1 lane PCI Express connector that can be used in any x1 or higher PCI Express slot. The PCIe-DIO-48S is suitable for use in application sensing inputs such as switch closures, TTL, LVTTL, CMOS logic and controlling external relays, driving indicator lights and more.

Each I/O line is buffered and capable of sourcing 32 mA or sinking 64 mA. Since the PCI Express x1 connector does not have sufficient power to drive this many channels, Acces provides an onboard Molex PC-style connector compatible with system power supplies (for disk drive power), to externally provide maximum 5V current sourcing capability.

Connections to the card are made via two industry standard, 50-pin headers. Each header has three 8-bit I/O ports designated A, B and C. Each port can be programmed as inputs or outputs. Change of State (COS) detection and interrupt capabilities are designed to relieve software from polling routines that can consume valuable processing time. Each port can be programmed for detecting state changes on their lines. An ISR (interrupt service routine) then reads the port to determine which bit changed state and clear the interrupt.

The card is supported for use in most operating systems and includes a free DOS, Linux and Windows 2000/XP/2003/Vista/7-compatible software package. This package contains sample programs and source code in Visual Basic, Delphi and Visual C++ for Windows. Also provided is a graphical setup program in Windows. Linux support includes installation files and basic samples for programming from user level via an open source kernel driver. 

ACCES I/O Products
San Diego, CA.
(858) 550-9559.
[www.accesio.com].