The NI PC-DIO-96/PnP is a 96-channel digital I/O expansion board for ISA bus systems, delivering parallel digital input/output control via four Intel 82C55A Programmable Peripheral Interface (PPI) chips. Designed for industrial and laboratory data acquisition and control, this half-length, half-height card features Plug and Play installation, software-timed operation, and configurable port architecture. Each of the four 82C55A chips controls 24 bits organized into three 8-bit ports; Ports A and B handle digital data I/O while Port C supports data, control, status, and handshake signals. The board transfers data at up to 780 Kbytes/s and supports 2-wire handshaking, periodic interrupts via an integrated 82C53 counter/timer, and pattern matching.
Technical Specifications
• 96 digital I/O channels
• Data transfer rate: Up to 780 Kbytes/s
• Logic level: 5 V TTL/CMOS
• Output current: 0.5 A maximum per pin
• Voltage rating: -0.5 to +5.5 V (with respect to ground)
• Output signal: Maximum +5 V
• Power-up state: User-configurable via jumper (high or low) with 100 kΩ pull resistors
• Primary I/O connector: 100-pin male
• Interface: Parallel, digital I/O; ISA bus
– Key Features
• Four 82C55A PPI chips—each controlling 24 bits in three 8-bit ports
• Port A and B: Digital data I/O
• Port C: Digital data I/O, control, status, and handshake signals
• Individual port programming as input or output
• 2-wire handshaking capability
• Integrated 82C53 counter/timer for periodic interrupt generation
• Pattern matching support
• Plug and Play technology for automatic configuration
– Typical Applications
Industrial control, laboratory automation, data acquisition systems, and high-speed parallel digital signal processing requiring multiple independent I/O ports with handshaking.
– Compatibility & Integration
Operating systems: Windows 2000/NT/XP. Software: NI-DAQ driver with LabVIEW, LabWindows/CVI, Measurement Studio, Visual Basic, and C/C++ support.
