Model Explanation

PXIe: PXI Express bus, 3U size, supports high-speed transmission and multi-box synchronization.

6536: High-speed bidirectional I/O series, 32 channels, 25 MHz, targeted at high-density and high-bandwidth digital testing.

Core Identifier: Bidirectional I/O, 25 MHz, 100 MB/s, programmable level, per-channel direction control, streaming data. Technical Specifications

Channels and Levels

Channels: 32 bidirectional digital I/O, each channel has independent input/output configuration.

Logic Levels: Software selectable: 2.5 V, 3.3 V, 5 V TTL.

Input Voltage: -1 V to +6 V; Output Voltage: 0 V to 5 V.

Single-channel Drive: 32 mA, can directly drive TTL loads, relays.

Timing and Performance

Maximum Clock: 25 MHz, sampling accuracy 10 ns.

Data Throughput: 100 MB/s, supports PXIe continuous streaming transmission.

Channel-to-Channel Jitter: ≤1.2 ns; Output Setup Time Deviation ≤1.5 ns.

Synchronous Clock: 100 MHz reference, multi-module / multi-rack synchronization.

General Specifications

Bus: PXIe Gen1, single slot, DMA and RTSI triggering.

Connector: Front panel 68-pin VHDCI, with SHC68-C68-D4 shielded cable.

Power Consumption: +5 V approximately 1.8 A, total power consumption ≈ 9 W.

Operating Temperature: 0 °C to +55 °C, industrial-grade wide temperature range.

Interface and Communication Configuration

Host Interface: PXIe bus, plug-and-play, DMA high-speed transmission, RTSI synchronization, PXI trigger bus.

Front Panel Interface: 68-pin VHDCI shielded connector, integrates all I/O, power, ground, strong anti-interference.

Trigger and Synchronization: Software / edge / handshake trigger; synchronized with 6535/6537 multi-modules, clock alignment in multi-rack.

Driver Software: NI-DAQmx, compatible with Windows / real-time systems, LabVIEW, C/C++, Python, TestStand development. Core function

32-channel bidirectional programmable I/O: Each channel has independent input/output, enabling flexible data acquisition and control.

Multi-level compatibility: 2.5/3.3/5 V TTL software switching, suitable for mainstream digital devices.

High-speed streaming transmission: 25 MHz, 100 MB/s, suitable for high-speed data capture and generation in image/display.

Precise timing synchronization: 100 MHz reference, channel-to-channel jitter ≤ 1.2 ns, multi-module synchronous testing.

Input filtering and change detection: Programmable debouncing, edge triggering, reducing CPU usage.

High driving capability: 32 mA per channel, capable of driving TTL loads, relays, and small actuators. Applicable scenarios

Semiconductor testing: Memory/Logic Device Testing, Parallel I/O Pattern Generation and Capture, Chip Protocol Simulation.

Image/Display Testing: High-speed Acquisition of CMOS Sensors, LCD/OLED Timing Control and Signal Verification.

High-speed Digital Communication: UART/SPI/I²C Protocol Simulation, Bus Monitoring, Handshake Interaction Testing.

Industrial Automation: High-density Switching Quantity Acquisition, High-speed Relay Array Control, Parallel Signal Synchronization Testing of Production Line.

Aerospace/Defense: Digital Signal Synchronization Acquisition under Strong Interference, Multi-device Timing Linkage, Weapon System I/O Control.

User and Maintenance Instructions

Key Usage Points

Installation: Insert into a single slot of the 3U PXIe chassis and lock the screws; recommended PXIe-1071/1085 chassis.

Cabling: Use SHC68-C68-D4 shielded cables, separate strong and weak electricity, avoid common ground interference; secure the 68-pin connection firmly.

Configuration: Set channel direction, level, clock, filtering and triggering in NI-MAX/DAQmx.

Timing Considerations: Cable length ≤ 1 m for ≥ 10 MHz, reduce attenuation and jitter.

Maintenance and Calibration

Cleaning: Use a dry soft cloth to wipe the panel and connectors, prevent dust and oxidation; avoid contact with liquids.

Calibration: Digital I/O does not require regular calibration, check level, drive current and timing every 2 years.

Storage: Place for long-term non-use in an environment of -20 °C to + 60 °C, humidity ≤ 60%, anti-static.

Troubleshooting: First check wiring, power supply, and configuration for abnormalities; check cable and grounding for timing abnormalities; check load overload/surge for output abnormalities.