The NI PXI-6508 is a 96-channel digital input/output card designed for PXI and CompactPCI chassis. It provides 5 V TTL/CMOS logic level switching across four 82C55A programmable peripheral interface chips, each delivering 24 bits of configurable I/O. The module supports unidirectional and bidirectional operation, 2-wire handshaking, and change notification for synchronized control and monitoring tasks. Onboard 100 kΩ pull-up resistors are software-configurable and jumper-selectable for power-up state management. With programmable input filters for debouncing, interrupt support, and data transfer rates up to 50 Kbytes/s, the PXI-6508 suits industrial automation, test systems, and laboratory instrumentation requiring flexible digital switching.
Technical Specifications
• 96 static digital I/O lines, software-configurable per channel for input or output
• Four 82C55A PPI chips; each provides 24 bits organized as three 8-bit ports (A, B, C)
• 5 V TTL/CMOS logic levels; 2.5 mA drive strength per channel
• Input voltage range: −0.3 V to 5.3 V; output: 0 V to 5 V
• 100 kΩ onboard pull-up resistors with jumper-selectable power-up state (high or low)
• Programmable input filters for glitch elimination and debouncing
• 2-wire handshaking; change notification and interrupt support
• Data transfer rate: up to 50 Kbytes/s via NI-DAQmx
• 100-pin, 0.050 series D-type female connector
• Operating temperature: 0 to 55 °C; storage: −20 to 70 °C
– Key Features
• Port C supports configurable digital I/O, control, status, or handshake signals
• Unidirectional and bidirectional I/O modes for diverse switching requirements
• PXI Specification Rev 1.0 compliant
– Compatibility & Integration
NI-DAQmx driver software enables development in LabVIEW, LabWindows/CVI, Measurement Studio, Python, ANSI C, C#.NET, and MATLAB. Bus interface supports PXI, PCI, and ISA architectures.
