What are PCI digital I/O products? PCI digital I/O products are a special type of data acquisition board that provides only digital inputs and digital outputs. A PCI digital I/O board or card has basic logic-level digital signals that are designed to interface with the PCI (Peripheral Component Interconnect) bus of a personal computer.

      Digital input voltage levels for the “On-State” or Logic Code “1” are typically from 2 to 5 volts. Digital input voltage levels for the “Off-State” or Logic Code “0” are typically from 0.8 to 0.0 volt.

      Digital output voltage levels for the “On-State” or Logic Code “1” are typically from 3 to 5 volts. Digital input (I) voltage levels for the “Off-State” or Logic Code “0” are typically from 0.4 to 0.0 volt.

      In addition to standard multi-channel PCI digital I/O products with logic level and high current drive outputs, the PCI digital I/O family of products includes much more. Included in this family you will find multi-channel counter/times (with and without crystal control oscillator), 2-4 channel quadrature encoder boards, electromechanical relay boards, and 32-bit interrupt vector input boards.

      PCI is an interconnection system between a microprocessor and attached devices in which expansion slots are spaced closely and offer high-speed operation. PCI digital I/O based systems can support both new PCI boards, while continuing to support Industry Standard Architecture (ISA) expansion boards, an older standard.

      Measurement Computing Corporation offers the largest selection of PC-based data acquisition and measurement products. Shop our online catalog by selecting a category above. From PCI, USB, PC/104, ISA, and PCMCIA bus boards to external systems based on USB, RS-232, RS-422, RS-485 and GPIB interfaces; Measurement Computing has everything you need for your PC-based data acquisition and control applications.