NI DAQCard-DIO-24 Digital I/O PC Card

The NI DAQCard-DIO-24 is a PCMCIA Type II digital I/O card delivering 24 programmable parallel channels for data acquisition and control applications. Built on the 82C55A Programmable Peripheral Interface architecture, it provides flexible port configuration across three 8-bit ports—Ports A and B dedicated to digital data I/O, and Port C configurable for data, control, status, or handshake signaling. The card interfaces via a 50-pin connector and operates on 5 V TTL/CMOS logic levels with high output drive capability and 100 kΩ pull-up resistors. Input buffering uses 74LS373 chips with standard high impedance. Two-wire handshaking is supported. Designed for notebook and desktop computers equipped with PCMCIA slots, the DAQCard-DIO-24 integrates with NI-DAQ driver software—supporting both Traditional NI-DAQ (Legacy) and NI-DAQmx drivers for Windows and Macintosh platforms. Industrial automation, laboratory research, and embedded systems benefit from its flexible I/O architecture and straightforward integration.

– Technical Specifications

• Digital I/O Lines: 24 programmable pins
• Architecture: 82C55A Programmable Peripheral Interface (PPI)
• Port Configuration: Three 8-bit ports; Ports A and B for digital data I/O; Port C for data I/O, control, status, or handshake signals
• Logic Level: 5 V TTL/CMOS
• Output Drive: High output drive capability
• Input Buffers: 74LS373 chips with high input impedance
• Pull-up Resistors: 100 kΩ pull-high configuration
• Power Supply: +5 V required
• Interface: PCMCIA Type II; 50-pin I/O connector
• Handshaking: 2-wire capability supported

– Key Features

• Flexible port configuration for input, output, or bidirectional operation
• Programmable I/O architecture eliminates fixed channel assignment
• High-impedance input buffers minimize loading effects
• Integrated handshaking support for coordinated signal exchange
• Direct PCMCIA integration for portable and legacy notebook platforms

– Typical Applications

• Industrial automation and process control
• Laboratory instrumentation and data logging
• Embedded system prototyping and testing
• Digital signal control and monitoring

– Compatibility & Integration

• Operating Systems: Windows and Macintosh
• Software: NI-DAQ driver software (Traditional NI-DAQ Legacy and NI-DAQmx compatible)
• LabVIEW integration with version-specific driver support
• PCMCIA slot required; compatible with notebooks and PCMCIA-equipped computers