ADLINK PCI-9112 Multi functional Data Acquisition Card

Deep technical analysis and engineering application of ADLINK PCI-9112/cPCI-9112 multifunctional data acquisition card

Introduction: The enduring value of classic multifunctional DAQ in testing and measurement

In the field of testing and measurement, multifunctional data acquisition with high integration can meet various needs such as analog input, analog output, digital I/O, and counting/timing with a single board solution, thereby reducing system complexity and cost. The Linghua PCI-9112 series is a model of such products, widely used in laboratory automation, production line testing, environmental monitoring, and teaching experiments since its launch.

The core competitiveness of this card lies in its flexible signal conditioning capability: 16 single ended or 8 differential analog inputs, combined with 4 levels of programmable gains (× 0.5, × 1, × 2, × 4, × 8), can cover a wide dynamic range from ± 10V to ± 0.625V (bipolar) and from 0~10V to 0~1.25V (unipolar). Although the sampling rate of 110 kS/s is not top-notch, it is more than sufficient for most sensor signals (temperature, pressure, vibration, displacement, etc.). In addition, it supports bus master DMA, ensuring efficient data transfer on Windows or Linux systems and reducing CPU burden.

This article will analyze the hardware design, interface definition, software support, and system integration points of the card layer by layer, providing engineers with a complete technical reference manual.

Analog input front-end: channel configuration and gain programming

2.1 Channel Mode

Single ended mode (SE): Provides 16 analog input channels (AI0~AI15), each measuring relative to the common ground (AGND). Suitable for scenarios where the signal source and acquisition card are grounded together without severe common mode noise.

Differential Mode (DIFF): Provides 8 differential channels (AIH0/AIL0~AIH7/AIL7), each pair of differential inputs can effectively suppress common mode interference, suitable for long-distance transmission or sensors with ground potential difference (such as thermocouples and strain gauges).

Mode selection is controlled through software configuration (register control), without the need for hardware jumpers, providing high flexibility.

2.2 Input Range and Gain

The combination of gain and range is shown in the following table (excerpted from the manual):

Gain bipolar range unipolar range

0.5 ±10V —

1 ±5V 0~10V

2 ±2.5V 0~5V

4 ±1.25V 0~2.5V

8 ±0.625V 0~1.25V

The gain of each channel can be independently programmed (through a channel gain queue), allowing signals of different ranges to be mixed in the same scanning sequence. For example, channel 0 measures ± 10V pressure sensor, channel 1 measures ± 1.25V thermocouple, and channel 2 measures 0-5V flowmeter, all of which can be collected simultaneously.

2.3 Accuracy indicators

Gain 0.5, 1: Accuracy of ± 0.01% FSR ± 1 LSB.

Gain 2 and 4: Accuracy of ± 0.02% FSR ± 1 LSB.

Gain 8: Accuracy of ± 0.04% FSR ± 1 LSB.

The minimum voltage resolution corresponding to a 12 bit resolution in the ± 10V range is about 4.88mV; in the ± 0.625V range, it is about 0.305mV. The small signal measurement accuracy is effectively improved through gain amplification.

2.4 Input Characteristics

Input impedance: 1 G Ω (high impedance), with minimal load on the signal source.

Overvoltage protection: Continuous ± 35V, can prevent accidental connection of high voltage and damage to equipment.

Coupling method: DC coupling, suitable for all low-frequency to mid frequency signals.

2.5 Data collection triggering and transmission

Trigger mode: software triggered (only supports software triggering, no external hardware triggering).

Data transmission: Supports programmable I/O, interrupts, and bus master DMA. In DMA mode, data is directly written from the board to the system memory through the PCI bus, without the need for CPU intervention, significantly improving throughput and reducing CPU usage.

Analog output: dual channel waveform generation capability

PCI-9112 provides two 12 bit analog output channels (DA0, DA1), suitable for generating excitation signals, controlling actuators, or serving as voltage references.

3.1 Output Range (Software Programmable)

Monopolar: 0~10V, 0~5V, 0~EXTREF (external reference voltage).

Bipolar: Not explicitly listed, but depending on the model suffix (PCI-9112 calibrated at 5V, PCI-9112A calibrated at 10V), it may support ± 5V or ± 10V (please refer to the detailed manual). This data manual only lists the range of unipolar polarity, and bipolar polarity needs to be combined with external references or set through jumper wires.

3.2 Performance Parameters

Resolution: 12 bits.

Establishment time: 30 μ s to ± 0.5 LSB.

Drive capability: ± 5 mA (maximum), can directly drive simple loads.

Data transmission: Programmable I/O (writing to output registers).

3.3 Calibration Options

PCI-9112: Analog output calibrated in 5V range.

PCI-9112A: Analog output calibrated in 10V range.

Users can choose the appropriate model based on the application to avoid accuracy loss caused by mismatched calibration ranges.

Digital I/O and Timer/Counter

4.1 Digital I/O

16 digital inputs+16 digital outputs, TTL level (5V compatible).

Data is read and written through programmable I/O, suitable for low-speed logic operations such as controlling indicator lights, relays, and reading switch status.

All digital I/O pins are led out through 37 pin D-Sub connectors (PCI) or 100 pin SCSI connectors (cPCI), and some signals are also provided through 20 pin flat cable connectors (CN1/CN2).

4.2 Universal Timer/Counter

1 channel, 16 bit resolution.

Reference clock: 2 MHz internal clock, while supporting up to 10 MHz external clock input (via EXTCLK pin).

TTL compatible, can be used for frequency measurement, pulse counting, PWM generation, or as a frequency divider source for sampling clocks.

Bus interface and physical specifications

5.1 PCI version (PCI-9112/PCI-9112A)

Supports 3.3V or 5V PCI bus (Universal PCI).

Size: 175mm x 107mm (excluding connectors).

I/O connector: a 37 pin D-Sub female socket (analog I/O, digital I/O, timer signal), and a 20 pin flat cable connector (digital I/O expansion).

5.2 CompactPCI version (cPCI-9112)

Compliant with PICMG 2.0 R2.1, 3U Eurocard specifications (160mm x 100mm).

Concentrate all I/O signals using a 100 pin SCSI-II connector, suitable for rack mounted high-density systems.

Power consumption:+5V 600mA typical,+12V 20mA typical (lower than 460mA/110mA in PCI version).

5.3 Power Supply and Environment

Working temperature: 0 ° C~60 ° C.

Storage temperature: -20 ° C~80 ° C.

Humidity: 5%~95% (no condensation).

Key points of attachment and system integration

6.1 Terminal board and cable

Linghua provides various accessories for convenient on-site wiring:

Attachment model description

DIN-37D-01 37 pin D-Sub terminal board (DIN rail installation)

DIN-20P-01 20 pin flat cable terminal block

ACLD-9137-01 Universal Terminal Board (with 37 pin D-Sub male connector)

ACLD-9182A-01 16 way isolated digital input terminal board

ACLD-9185-01 16 way isolated digital input terminal board (different isolation schemes)

ACL-10137-1MF 37 pin D-Sub male/female cable (1m)

ACL-10120-1 20 pin flat cable (1m)

For cPCI: DIN-100S-01 100 pin SCSI-II terminal board+ACL-102100-1 cable

6.2 System Integration Precautions

Analog input wiring:

Differential mode should use twisted pair shielded wires and connect the shielding layer to AGND.

High impedance input (1G Ω) is easily affected by noise, and the length of the signal line should be shortened as much as possible.

Avoid suspending unconnected inputs (not explicitly mentioned in the manual, but high impedance input suspension may introduce noise, it is recommended to ground or connect to a fixed level).

Overvoltage protection:

Continuous ± 35V overvoltage protection can prevent most misconnections, but exceeding this range continuously may still damage the card.

DMA transfer:

Ensure that the system motherboard supports PCI bus master control and that this feature is not disabled in the BIOS.

In Windows, the driver automatically allocates DMA memory without user intervention.

Calibration cycle:

It is recommended to calibrate every 6-12 months (depending on environmental stability), and high-precision voltage sources can be used in conjunction with calibration software.

Software support and programming

7.1 Operating System Compatibility

Official support:

Windows 7/Vista/XP/2000/2003 Server (32-bit).

Linux (driven by PCIS-DASK/X).

7.2 Drivers and Development Tools

PCIS-DASK for Windows: Provides standard DLLs and supports languages such as VB.net, VC.net, VB, VC++, BCB, Delphi, etc.

PCIS-DASK/X for Linux: suitable for 2.6. x kernel, providing C/C++API.

DAQPilot for LabVIEW: LabVIEW driver program that accelerates graphical programming.

DAQ-MTTLB for MATLAB: MATLAB Data Acquisition Toolbox Interface.

AD Loger and DAQBench provide fast testing and recording functions without programming.

7.3 Programming Process Example

Call _9112Initial (or W_9112Initial) to initialize the board and return the base address and IRQ.

Configure analog input channel mode (single ended/differential) and gain.

Set the sampling frequency (via internal timer or external clock).

Call _9111_AD_SMA_Start to start the collection process (specifying the number of channels, sampling points, and buffer address).

Loop call _911_2AD_SMA_Status to check the transmission progress.

After the data transmission is completed, process the data and call _9111_AD_SMA_Stop (if stopped early).

Release resources.

Comparison and selection between PCI-9112 and cPCI-9112

Comparison item PCI-9112/9112A cPCI-9112

Bus interface standard 32-bit PCI (3.3/5V) CompactPCI (3U)

Size 175 × 107 mm 160 × 100 mm

Connector 37 pin D-Sub+20 pin flat cable 100 pin SCSI-II

Power consumption (+5V) 460mA (9112A) 600mA

Applicable scenarios include industrial control computers, desktop PC expansion rack systems, and high reliability backplane card insertion

The terminal board accessories are abundant (DIN-37D, ACLD series) and relatively few (DIN-100S)

Selection suggestion:

If the system is a standard PCI industrial computer or desktop computer and cost sensitive, choose PCI-9112/9112A.

If you need CompactPCI chassis hot swapping, backplane synchronization, or high-density installation, choose cPCI-9112.

Analog output calibration range selection: If commonly used 0-5V output, choose PCI-9112; If 0~10V is commonly used, choose PCI-9112A.

Maintenance and troubleshooting suggestions

Driver installation failed: Check if the operating system is correctly recognized and ensure that the PCI slot is not disabled in the BIOS.

Abnormal analog input reading:

Check if the input mode (single ended/differential) matches the actual wiring.

Check if the gain setting is correct and if the range covers the signal range.

Verify whether the grounding is reliable and whether there is common mode voltage exceeding the limit in differential mode.

DMA transfer error: Reduce sampling rate, check motherboard chipset compatibility, try updating driver program.

Analog output without signal: Confirm that the output is enabled and check if the load is too heavy (exceeding ± 5mA).