NI AT-DIO-32F High-Speed 32-Bit Parallel Digital I/O Interface

The NI AT-DIO-32F is a high-speed 32-bit parallel digital I/O interface designed for data acquisition and real-time control in industrial and research applications. It delivers 450 kwords/second throughput with 5 µsec response time, organizing 32 I/O channels into four configurable 8-bit ports. The board supports TTL-compatible signaling, DMA transfers on two channels, and interrupt-driven I/O from all 32 input lines. Its flexible architecture accommodates programmed I/O, pattern generation, and handshaking protocols, making it suitable for integration with panel meters, BCD instruments, and optoisolated relay systems.

– Technical Specifications

• Data Transfer Rate: 450 kwords/second (Programmed I/O)
• Response Time: 5 µsec input/output
• I/O Configuration: 32-bit parallel organized as four 8-bit ports
• Output Voltage: 35 VDC maximum per channel
• Output Current: 50 mA maximum per channel
• Input Resistance: 2.2 kΩ
• Input Currents: 4.9 mA ON / 0.66 mA OFF maximum
• External Supply: 12–24 VDC (±10%)
• Connector: 50-pin male (DEC DRV11J compatible)
• Operating Temperature: 0 to 50°C
• Operating Humidity: 10 to 90% RH (non-condensing)
• Dimensions: 13.4 × 5.0 inches

– Key Features

• TTL-compatible input and output signaling
• Onboard Zener diode and overcurrent protection on outputs
• Configurable software-selectable digital filter for noise rejection
• All 32 inputs usable as interrupt sources with single interrupt level
• Two DMA channels for pattern generation and high-speed transfers
• Programmable I/O address aligned to any 32-byte boundary
• RTSI bus interface for inter-board communication within AT Series ecosystem
• Extensive handshaking options for legacy device compatibility

– Typical Applications

• Real-time industrial process control and monitoring
• Automated test equipment interfacing
• Legacy system integration (DEC, IBM PC/XT, Apple Macintosh II)
• Pattern generation and digital stimulus applications
• Interrupt-driven sensor acquisition

– Compatibility & Integration

Supports IBM PC/XT, PC AT, Apple Macintosh II, Q-BUS 16-bit, and DEC LSI-11 systems with 32-bit DRV11J interface. Programming via NI-DAQ, LabVIEW, or DOS-based LabWindows. AMD Am29C983 controller chipset.