NI PCI-6229

NI PCI-6229

Product Overview
The PCI-6229 is an M Series multifunction data acquisition device from National Instruments. It integrates analog input, analog output, digital I/O, and counter/timer functions in a single PCI card. The device provides 32 single-ended or 16 differential analog input channels, 16-bit resolution, and a maximum aggregate sampling rate of 250 kS/s. It is designed for mid-speed, high-channel-count measurement tasks in industrial automation, laboratory testing, equipment validation, and process monitoring. NI has marked the PCI-6229 as mature or no longer available for new designs, and recommends the PCIe-6323 as a replacement for new applications.

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Description

NI PCI-6229

Technical Specifications

  • Brand: National Instruments
  • Product Family: M Series Multifunction DAQ
  • Model: PCI-6229
  • Bus Interface: PCI
  • Analog Input Channels: 32 single-ended or 16 differential
  • Analog Input Resolution: 16-bit
  • Maximum Analog Input Sampling Rate: 250 kS/s aggregate
  • Analog Output Channels: 4
  • Analog Output Resolution: 16-bit
  • Maximum Analog Output Update Rate: 833 kS/s
  • Digital I/O Lines: 48 TTL-compatible lines
  • Counters/Timers: 2 counters, 32-bit
  • Input Ranges: ±10 V, ±5 V, ±1 V, ±0.2 V
  • Input Coupling: DC
  • Input Impedance: Greater than 10 GΩ in parallel with 100 pF when powered
  • Small-Signal Bandwidth: Approximately 700 kHz
  • Timing Accuracy: 50 ppm
  • Timing Resolution: 50 ns
  • AI FIFO Size: 4,095 samples
  • Power Requirement: +5 V DC, up to 1.7 A
  • Operating Temperature: 0 °C to 55 °C
  • Storage Temperature: -20 °C to 70 °C
  • Driver Software: NI-DAQmx

Functional Features

  • High channel count: Supports up to 32 single-ended or 16 differential analog inputs.
  • 16-bit precision: Provides accurate voltage measurement for industrial and laboratory signals.
  • Four analog outputs: Enables multi-channel control, waveform generation, and actuator driving.
  • 48 digital I/O lines: Supports complex digital control, status monitoring, and protocol interfacing.
  • Correlated digital I/O: Allows digital lines to be synchronized with analog timing.
  • NI-STC 2 timing engine: Provides advanced triggering, clocking, and synchronization.
  • NI-PGIA 2 programmable gain: Improves measurement flexibility across different signal levels.
  • NI-MCal calibration technology: Supports accurate and traceable calibration.

Application Scenarios

  • Industrial automation monitoring
  • Multi-channel sensor acquisition
  • Process control and data logging
  • Equipment test and validation
  • HVAC and energy measurement
  • Laboratory teaching and research
  • Machine state monitoring
  • Replacement for legacy E Series multifunction DAQ systems

Performance Parameters

  • AI Resolution: 16-bit
  • AI Channels: 32 SE or 16 differential
  • AI Sampling Rate: 250 kS/s aggregate
  • AO Channels: 4
  • AO Resolution: 16-bit
  • AO Update Rate: 833 kS/s
  • DIO Lines: 48
  • Counter Count: 2 counters, 32-bit
  • Input Bandwidth: Approximately 700 kHz
  • Timing Accuracy: 50 ppm

Material Composition

  • PCB Assembly: ADC, DAC, digital I/O buffers, counter logic, and timing engine
  • Analog Front End: NI-PGIA 2 programmable gain amplifiers and input protection circuits
  • Digital Section: 48-line TTL-compatible I/O and correlated DIO logic
  • Connectors: PCI edge connector and multifunction I/O connector
  • Shielding: Metal bracket and board-level shielding for electromagnetic compatibility

Structural Features

  • Standard PCI card format: Installs into a compatible PCI slot.
  • High-density I/O: Combines AI, AO, DIO, and counters on one board.
  • Software-configurable: No jumpers or potentiometers required for normal operation.
  • Correlated DIO support: Enables synchronized digital and analog operations.
  • Compact single-slot design: Reduces chassis space compared with multiple single-function cards.

Working Principle
The PCI-6229 samples analog input signals through its multiplexed 16-bit ADC. Selected channels are converted according to the configured scan list, sampling rate, and input range. Digital data is transferred to the host computer through the PCI bus using DMA or interrupt-based transfers. The four 16-bit analog outputs generate controlled voltage signals for actuators, drives, or waveform generation. The 48 digital I/O lines read or drive TTL-level signals, and the correlated DIO feature allows digital operations to follow the same timing engine as analog acquisition. Two 32-bit counters support frequency measurement, pulse counting, position decoding, and timing tasks.

Installation Requirements

  • Install the card into a compatible PCI slot.
  • Ensure the host power supply can provide +5 V at up to 1.7 A.
  • Connect analog signals using shielded cables and proper grounding.
  • Keep analog input wiring separated from high-voltage and high-current cables.
  • Configure channel mode, input range, sampling rate, and trigger source in NI-DAQmx.
  • Assign digital I/O direction and correlated DIO timing in software.
  • Verify calibration status before precision measurements.

Precautions for Use

  • The PCI-6229 is considered mature or no longer available for new designs; consider PCIe-6323 for new projects.
  • Do not exceed the specified input voltage and common-mode limits.
  • The 250 kS/s rate is an aggregate rate shared across all active analog input channels.
  • Use signal conditioning for current, high-voltage, thermocouple, or isolated measurements.
  • Avoid using the device for safety-critical functions unless the complete system is certified.
  • Confirm exact pin assignments, accuracy specifications, and environmental ratings from the official NI PCI-6229 specifications document.

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