Comprehensive Product Summary: ADLINK NuDAQ® PCI-7442 Isolated Digital I/O Card

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### 1. Product Overview

Product Name: NuDAQ® PCI-7442
Model: PCI-7442
Series: NuDAQ PCI-7440 Series (includes PCI-7442, PCI-7443, PCI-7444)
Article Number: PCI-7442 / Part No. 50-11217-1010
Manufacturer: ADLINK Technology Inc.
Website: [www.adlinktech.com](http://www.adlinktech.com)
Product Type: 64-Channel Isolated Digital Input and 64-Channel Isolated Digital Output PCI Bus Card with 32 TTL I/O Channels

The ADLINK PCI-7442 is a high-density, isolated digital input/output (DIO) card designed for PCI bus-based industrial automation and control systems. It provides 64 optically isolated digital input channels, 64 optically isolated digital output channels, and 32 programmable TTL I/O channels. The card integrates advanced features such as Change of State (COS) interrupt detection, watchdog timer (WDT) safety functions, digital output readback, and programmable power-up and safety states. With robust 1,250 V RMS isolation and high current drive capability, it is engineered for reliable operation in electrically noisy industrial environments.

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### 2. Key Features

- Universal PCI Interface: 32-bit, 3.3 V/5 V PCI bus, plug-and-play compliant.
- High-Density I/O: 64 opto-isolated digital inputs and 64 opto-isolated digital outputs.
- Additional TTL I/O: 32 programmable TTL channels (3.3 V/5 V logic compatible).
- Optical Isolation: 1,250 V RMS isolation between channels and system logic.
- Change of State (COS) Detection: Programmable COS interrupt for all 64 input channels; detects rising or falling edges.
- Watchdog Timer (WDT): 32-bit timer with 10 MHz base clock; programmable overflow interval from 100 ns to 429.496 s.
- Safety Functions:
- Programmable power-up DO initial state.
- Programmable safety DO state on WDT interrupt.
- DO state retention after hot system reset.
- Output Drive Capability: 250 mA sink current per channel (300 mA max).
- Digital Output Readback: Real-time verification of output states.
- Board Identification (Board ID): DIP switch selectable (16 unique IDs) for multi-card systems.
- Software Support: Compatible with ADLINK PCIS-DASK, DAQ-LVIEW PnP (LabVIEW® driver), and DAQBench™ ActiveX controls.
- Comprehensive SDK: C/C++ libraries for DOS and Windows environments.
- Industrial-Grade Reliability: ESD protection, non-polarity inputs, and robust MOSFET output drivers.

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### 3. Technical Specifications

Optically Isolated Digital Inputs
- Channels: 64
- Type: Opto-isolated (PC-3H4 phototransistor couplers)
- Input Voltage Range: 0 V – 28 V (non-polarity)
- Logic Levels:
- Logic High: 5 V – 28 V
- Logic Low: 0 V – 1.5 V
- Input Resistance: 2.4 kΩ ± 5% (0.5 W)
- Max Input Current: 15 mA per channel
- Isolation Voltage: 1,250 V RMS
- Input Protection: ESD protection circuit
- Interrupt Source: COS detection (64 lines) and WDT counter

Optically Isolated Digital Outputs
- Channels: 64
- Type: Open-drain power MOSFET driver (TPC8206)
- Output Voltage Range: 5 V – 40 V
- Sink Current: 250 mA continuous @ 60 °C (300 mA max)
- Isolation Voltage: 1,250 V RMS
- Data Transfer: Programmed I/O

Isolated +5 V Power Supply
- Output Voltage: +5 V
- Max Output Current: 100 mA @ 40 °C

Programmable TTL I/O
- Channels: 32 (JP3 and JP4 connectors)
- Logic Level: TTL / 3.3 V TTL
- Max Current: 4 mA per channel
- Direction: Programmable per channel (input/output)

Watchdog Timer (WDT)
- Base Clock: 10 MHz fixed
- Counter Width: 32-bit
- Interval Range: 100 ns – 429.496 s
- Functions: Overflow interrupt, safety DO trigger, system recovery

General Specifications
- Dimensions: 174.7 mm (L) × 106.7 mm (W) (standard PCI form factor)
- Bus Interface: 32-bit PCI, 3.3 V/5 V signaling
- Operating Temperature: 0 °C – 60 °C
- Storage Temperature: −40 °C – 80 °C
- Humidity: 5 % – 85 % RH, non-condensing
- Power Consumption: +5 V @ 800 mA (typical)

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### 4. Functionality

Operational Overview
The PCI-7442 interfaces industrial digital signals to a host PC via the PCI bus. Each input channel is optically isolated to protect the system from high-voltage transients and ground loops. Output channels use open-drain MOSFETs for driving external loads such as relays, solenoids, or indicators. The card supports both active-high and active-low logic configurations.

Change of State (COS) Interrupts
Each input channel can generate an interrupt when its logic state changes. COS detection is edge-sensitive (rising or falling) and sampled at 33 MHz, ensuring detection of pulses longer than 31 ns. Two banks (DI0–DI31 and DI32–DI63) can be independently enabled for COS interrupts.

Watchdog Timer (WDT)
The onboard WDT monitors system health. If the host fails to refresh the timer within the programmed interval, the card can automatically assert a safety output pattern or trigger an interrupt, ensuring fail-safe operation.

Digital Output Readback
All 64 output channels support readback verification, allowing software to confirm actual output states. This feature is critical for safety and diagnostics in automation systems.

TTL I/O Functionality
The 32 TTL channels can be configured dynamically as inputs or outputs. They are suitable for low-voltage logic interfacing, control signaling, or status monitoring.

Use Cases and Applications
- Machine and process automation
- Industrial on/off control and relay actuation
- Signal switching and multiplexing
- Laboratory instrumentation and test automation
- Safety-critical control systems requiring watchdog supervision

Compatibility
- PCI 2.2 compliant (32-bit, 33 MHz)
- Compatible with Windows 98/NT/2000/XP and DOS environments
- Supported by ADLINK’s PCIS-DASK driver library and LabVIEW® VIs

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### 5. Components & Accessories

Included Items
- PCI-7442 card
- ACL-10337 DB37F bracket (VHDCI to DB37 interface)
- ADLINK All-in-One CD (drivers, manuals, and software tools)
- Printed user manual

Connectors
- CN1: 64-CH isolated digital input (VHDCI 68-pin female)
- CN2: 64-CH isolated digital output (VHDCI 68-pin female)
- JP3: 16-CH TTL I/O (TTL0–15)
- JP4: 16-CH TTL I/O (TTL16–31)
- S1: 4-bit DIP switch for Board ID selection

Optional Accessories
- ACLD-9188: 68-pin SCSI-type terminal board
- ACLD-9137: DB37 terminal board
- Shielded VHDCI cables for noise immunity

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### 6. Installation & Setup

System Requirements
- PCI slot (32-bit, 3.3 V/5 V compatible)
- Windows 98/NT/2000/XP or DOS environment
- ADLINK PCIS-DASK driver package

Installation Steps
1. Power off the host PC and insert the PCI-7442 into an available PCI slot.
2. Secure the card and connect the VHDCI cables to CN1 and CN2.
3. Configure the Board ID using DIP switch S1 (values 0–15).
4. Power on the system; the BIOS automatically assigns resources (PnP).
5. Install the ADLINK software drivers from the All-in-One CD.
6. Verify installation using the diagnostic utilities provided.

Mounting Options
Standard PCI bracket with VHDCI connectors; compatible with industrial PC chassis.

Configuration
- Board ID: 4-bit DIP switch (default 1111 = ID 0)
- COS and WDT functions configured via software API
- TTL I/O direction programmable per channel

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### 7. Performance & Capabilities

Speed and Responsiveness
- Input sampling rate: 33 MHz (COS detection)
- WDT timing resolution: 100 ns
- PCI bus throughput: 132 MB/s (theoretical)

Capacity
- 160 total digital channels (64 DI + 64 DO + 32 TTL)
- Supports multiple cards in one system (unique Board IDs)

Efficiency and Reliability
- Optical isolation ensures signal integrity in noisy environments.
- MOSFET outputs provide high-speed switching and long life.
- Readback and watchdog functions enhance system safety.

Limitations
- Max sink current per channel: 300 mA
- Total isolated +5 V output limited to 100 mA
- Operating temperature limited to 60 °C

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### 8. Standards & Compliance

- Bus Interface: PCI Local Bus Specification Rev. 2.2
- Isolation: 1,250 V RMS optical isolation
- EMC/ESD Protection: Integrated ESD protection circuits
- Safety: Designed for industrial-grade reliability and fail-safe operation
- Software Standards:
- PCIS-DASK driver API (Windows)
- DAQ-LVIEW PnP (LabVIEW®)
- DAQBench™ ActiveX controls
- Environmental Compliance: RoHS-compliant manufacturing (per ADLINK standards)

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### 9. Additional Information

Warranty
- Standard limited warranty: 2 years (1 year in China)
- Coverage includes manufacturing defects and hardware failures under normal use.
- Exclusions: misuse, unauthorized repair, environmental damage, or altered serial numbers.
- RMA procedure available via [http://rma.adlinktech.com/policy](http://rma.adlinktech.com/policy).

Technical Support
- Email: service@adlinktech.com
- Phone: +886-2-8226-5877
- Fax: +886-2-8226-5717
- Address: 9F, No. 166, Jian Yi Road, Chungho City, Taipei 235, Taiwan

Maintenance
- Handle only in ESD-safe environments.
- Avoid exceeding rated voltage/current limits.
- Periodically inspect connectors and cables for wear.

Software Updates
- Latest drivers and manuals available on ADLINK’s website.
- PCIS-DASK and DAQ-LVIEW PnP regularly updated for OS compatibility.

Support Tools
- Diagnostic utilities for I/O testing and interrupt verification.
- Example source code for C/C++, VB, and LabVIEW®.

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### Summary

The ADLINK NuDAQ® PCI-7442 is a robust, high-performance isolated digital I/O card tailored for industrial automation, control, and monitoring applications. It combines 64 optically isolated inputs, 64 isolated outputs, and 32 TTL I/O channels into a single PCI interface, offering exceptional flexibility and safety. With features such as programmable COS interrupts, watchdog timer protection, and digital output readback, the PCI-7442 ensures reliable operation in mission-critical environments. Its comprehensive software support and plug-and-play PCI compliance make it an ideal choice for engineers developing deterministic, high-channel-count digital control systems.