The NI DAQPad-6508 is a USB-based digital I/O device delivering 96 bidirectional static I/O lines for portable data acquisition and control. Built on four 24-bit Programmable Peripheral Interfaces divisible into twelve 8-bit sub-ports, it supports TTL and CMOS logic levels at 5 V and handles transfer rates up to 60 S/s per sub-port. The device integrates interrupt and programmed I/O data transfer methods, with optional 2-wire handshaking capability using dedicated port C control lines. A 100 kΩ pull-up resistor on each terminal allows manual configuration of power-up states to high or low logic levels.
Technical Specifications
• Digital I/O Channels: 96 bidirectional, 5 V static lines
• Logic Levels: TTL and CMOS compatible
• PPI Architecture: 4 × 24-bit PPIs, each subdivided into three 8-bit sub-ports
• Transfer Rate: Up to 60 S/s per sub-port
• Data Transfer Methods: Interrupts, Programmed I/O
• Handshaking: 2-wire capability with Port C control line allocation
• Output Current: 2.5 mA per channel, 240 mA total; 0.5 A maximum at +5 VDC (pins 49, 99)
• Voltage Rating: −0.5 V to +5.5 V absolute maximum
• Power Supply: 9–30 VDC external, up to 12 W; USB 4.40–5.25 VDC, 220 mA typical, 500 mA maximum
• Connector: 100-pin female 0.050″ D-type; adapter-compatible with four 50-pin ribbon cables (PC-DIO-24 pinout)
– Key Features
• High-density 96-line I/O configuration with flexible sub-port organization
• USB connectivity for portable deployment without external DAQ chassis
• Configurable power-up state per terminal via integrated pull-up resistors
• Parallel 2-wire handshaking for protocol-driven I/O sequences
– Typical Applications
• Laboratory test automation and signal monitoring
• Production test systems with multi-channel digital control
• Industrial process monitoring and relay actuation
• Development and prototyping of digital control systems
– Compatibility & Integration
• Software: NI-DAQ driver suite with LabVIEW and LabWindows/CVI support
• Peripheral Control: Plotters, I/O modules, terminal panels, printers, solid-state relays, test instruments, I/O racks
• Operating Environment: 0° to 70° C; −55° to 150° C storage; 5% to 90% relative humidity (non-condensing)
• Dimensions: 9.0 × 5.7 inches
