A PCI digital I/O Card is a special type of data acquisition card that provides only digital inputs and digital outputs. The digital I/O on a data acquisition card or board typically interfaces with standard logic-level digital signals.

      A PCI digital I/O Card (containing and A/D or D/A) may have 4, 8, 16, 32 lines or channels of Digital I/O, and can be in almost any combination of input and output channels. For larger, more complex applications, a PCI digital I/O Card is even available with 96 channels of I/O. Some boards provide logic level and high current drive outputs (64 mA sink, 15 mA source), compatible with relay and SSR and relay racks.

      In addition to a standard multi-channel PCI digital I/O card with logic level and high current drive outputs, the 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.

Digital I/O Card Logic Levels

      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 voltage levels for the “Off-State” or Logic Code “0” are typically from 0.4 to 0.0 volt.

      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 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.