Comprehensive Product Summary: ADLINK ACL-7125 ISA 8/8 DIO Isolated Relay/Opto Polarity-Free Card

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### 1. Product Overview

Product Name: ACL-7125
Model Number: ACL-7125
Series: NuDAQ ISA Digital I/O Series
Article Number: ACL-7125
Manufacturer: ADLINK Technology Inc.
Manufacturer Website: [www.adlinktech.com](http://www.adlinktech.com)
Product Type: ISA Bus 8 Relay & 8 Isolated Digital Input (DI) Card
Product Description: The ADLINK ACL-7125 is an industrial-grade digital I/O card designed for ISA bus systems. It integrates eight relay actuator outputs and eight opto-isolated digital input channels, providing reliable signal switching and isolation for industrial automation, laboratory control, and general-purpose digital interfacing applications.

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### 2. Key Features

- Dual Functionality: Combines 8 relay outputs and 8 opto-isolated digital inputs on a single ISA card.
- Relay Configuration: Four Form C (DPDT) and four Form A (SPST) relays for flexible switching applications.
- Opto-Isolated Inputs: Eight non-polarity-sensitive input channels using PC-814 opto-isolators for AC or DC signals.
- High Isolation: 2500 Vrms isolation between input channels and ground, ensuring robust noise immunity.
- LED Indicators: Each relay output is accompanied by an LED indicator for visual status monitoring.
- Selectable Input Filtering: Jumper-selectable AC-filter or non-filter (DC) input configuration for each channel.
- ISA Bus Interface: 16-bit ISA bus compatibility for legacy and industrial PC systems.
- Compact Design: PCB dimensions of 148 mm (L) × 107 mm (W) for easy integration into standard ISA slots.
- Software Support: Compatible with DOS, Windows 95/98/NT, and LabVIEW via ADLINK software libraries (ACLS-DLL1 and ACLS-LVIEW).
- Industrial Reliability: Designed for harsh environments with wide operating temperature and humidity ranges.

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### 3. Technical Specifications

Relay Outputs:
- Quantity: 8 relays (R0–R7)
- Relay Type:
- R0–R3: Form C (DPDT)
- R4–R7: Form A (SPST-NO)
- Contact Rating: 0.5 A @ 120 VAC; 1 A @ 24 VDC
- Contact Type: Bifurcated contacts for improved reliability
- Breakdown Voltage: 1000 V AC/DC minimum
- Insulation Resistance: 100 MΩ maximum
- Relay ON/OFF Time: 5 ms typical, 10 ms maximum
- Life Expectancy: 10 million operations at full load
- Coil Voltage: +12 VDC @ 33 mA per relay (0.264 A total when all relays are energized)

Isolated Digital Inputs:
- Channels: 8 opto-isolated inputs
- Opto-Isolator Type: PC-814 or equivalent
- Input Signal Type: AC (polarity-free) or DC
- Input Voltage Range: Up to 24 VDC or 24 VAC (50–1000 Hz)
- Threshold Voltage: 2.4 VDC
- Input Current: 20 mA maximum
- Input Resistance: 1.2 kΩ
- Isolation Voltage: 2500 Vrms channel-to-ground
- Response Time: 20 µs (without AC filter), 2.2 ms (with AC filter)

General Specifications:
- Bus Interface: 16-bit ISA bus
- Connector Type: One 37-pin female D-type connector
- Dimensions: 148 mm (L) × 107 mm (W)
- Operating Temperature: 0°C to 55°C
- Storage Temperature: -20°C to 80°C
- Humidity: 5% to 90% RH, non-condensing
- Power Consumption:
- +5 VDC @ 130 mA (typical)
- +12 VDC @ 180 mA (maximum, all relays energized)

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### 4. Functionality

The ACL-7125 functions as a digital I/O interface card for industrial control systems. It provides both relay-based output control and opto-isolated input sensing:

- Relay Outputs:
Each relay can switch external loads such as solenoids, lamps, or contactors. The relays are controlled via software commands written to the card’s I/O port. Logical “1” energizes the relay; logical “0” de-energizes it.
- Form C relays (R0–R3) provide both normally open (NO) and normally closed (NC) contacts.
- Form A relays (R4–R7) provide normally open contacts only.

- Isolated Inputs:
The eight opto-isolated inputs detect external digital signals without polarity sensitivity. Each channel can be configured for AC or DC input via jumpers (JP1–JP8). The opto-isolation ensures electrical separation between field signals and the PC system, protecting against voltage spikes and noise.

Use Cases and Applications:
- Industrial ON/OFF control and automation
- External high-power relay driving
- Signal switching and matrix control
- Laboratory instrumentation and test automation
- Limit switch and contact status monitoring
- General-purpose digital I/O expansion for ISA-based systems

Compatibility:
- Compatible with DOS, Windows 95/98/NT, and LabVIEW environments.
- Programmable using BASIC, C, Pascal, or Assembly.
- Supported by ADLINK’s ACLS-DLL1 (Windows DLL library) and ACLS-LVIEW (LabVIEW VIs).

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### 5. Components & Accessories

Included Items:
- ACL-7125 Relay Actuator & Isolated D/I Card
- DB-37 male connector assembly
- ADLINK software CD (includes DOS library and utilities)
- User’s Manual

Optional Accessories:
- ACLS-DLL1: Windows DLL software package for Visual Basic, C/C++, and Delphi
- ACLS-LVIEW: LabVIEW driver package for Windows 3.1/95/98/NT
- External relay boards or terminal blocks for field wiring

Connectors:
- Main Connector: 37-pin female D-type
- Pin Assignments:
- NOx, NCx, COMx: Relay contact terminals
- DIxA, DIxB: Digital input terminals (non-polarity sensitive)
- GND: System ground

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### 6. Installation & Setup

Installation Requirements:
- IBM PC/AT or compatible system with an available ISA slot
- Anti-static handling precautions (use grounded wrist strap and mat)

Installation Steps:
1. Verify package contents and inspect for shipping damage.
2. Configure base I/O address using DIP switch SW1 (default: 0x2A8).
3. Set input signal type (AC-filter or DC) using jumpers JP1–JP8.
4. Insert the ACL-7125 into an available ISA slot.
5. Connect external devices to the DB-37 connector.
6. Install the DOS or Windows software library from the ADLINK CD.

Base Address Configuration:
- Selectable via 8-position DIP switch (SW1).
- Address range: 0x200–0x3FF (default 0x2A8).
- Requires two consecutive I/O addresses.

Input Signal Configuration:
- Each channel configurable via jumper:
- Pins 1–2: AC-filter (AC input)
- Pins 2–3: Non-AC-filter (DC input, default)

Software Installation:
- DOS: Run `SETUP` from `X:\NuDAQISA\7125` directory on the ADLINK CD.
- Files installed to `C:\ADLINK\7125\DOS`.

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### 7. Performance & Capabilities

Relay Performance:
- Fast switching: 5 ms typical response time.
- Long mechanical life: 10 million operations at rated load.
- Supports both resistive and inductive loads (with appropriate protection circuits).

Input Performance:
- High-speed response: 20 µs (DC mode).
- Noise suppression: 2.2 ms response with AC filter enabled.
- Wide input voltage range supports both AC and DC signals.

Electrical Isolation:
- 2500 Vrms isolation between input channels and ground.
- 1000 V breakdown voltage across relay contacts.

Power Efficiency:
- Low power draw from system supply (+5 V and +12 V rails).
- Efficient relay coil design minimizes total current consumption.

Limitations:
- Designed for low-current switching (≤1 A @ 24 VDC).
- Not suitable for high-voltage or high-current power switching without external relays.
- ISA bus interface limits use to legacy or industrial PC systems.

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### 8. Standards & Compliance

Certifications and Compliance:
- Designed and manufactured by ADLINK Technology Inc., compliant with industrial-grade design standards.
- Meets general ISA bus electrical and mechanical specifications.
- Isolation and insulation ratings conform to industrial safety requirements (2500 Vrms isolation).
- Operating environment suitable for industrial temperature and humidity ranges.

Industry Standards:
- ISA (Industry Standard Architecture) 16-bit bus interface
- Opto-isolation using PC-814 standard optocouplers
- Relay contact protection circuits conform to standard RC, diode, zener, and varistor suppression methods

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### 9. Additional Information

Warranty:
- Duration: 1-year limited warranty from date of purchase.
- Coverage: Defects in materials and workmanship.
- Exclusions:
- Damage due to misuse, modification, or operation beyond specifications.
- Units with removed or altered serial numbers.
- Consequential damages are excluded; liability limited to product cost.
- Service Procedure:
- Contact ADLINK or authorized distributor before returning the product.
- Return must be postage-prepaid and securely packaged.
- Proof of purchase required for warranty service.

Technical Support Contacts:
- Website: [www.adlinktech.com](http://www.adlinktech.com)
- Email:
- General Service: service@adlink.com.tw
- NuDAQ Support: nudaq@adlink.com.tw
- Software Support: sw@adlink.com.tw
- Telephone: +886-2-82265877
- Fax: +886-2-82265717
- Address: 9F, No. 166, Jian Yi Road, Chungho City, Taipei 235, Taiwan, R.O.C.

Maintenance & Handling:
- Handle only in ESD-safe environments.
- Avoid mechanical stress or bending of the PCB.
- Ensure proper relay contact protection circuits (RC, diode, zener, or varistor) are used for inductive loads.
- Periodically inspect connectors and relays for wear in long-term installations.

Software Updates:
- Updated drivers and libraries available from ADLINK’s website.
- Contact ADLINK technical support for the latest Windows and LabVIEW integration tools.

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### Summary

The ADLINK ACL-7125 is a robust, industrial-grade ISA digital I/O card that integrates eight relay outputs and eight opto-isolated digital inputs into a compact, reliable module. Its design emphasizes electrical isolation, flexible configuration, and compatibility with legacy ISA systems, making it ideal for industrial automation, laboratory control, and signal interfacing applications. With selectable input filtering, LED relay indicators, and comprehensive software support, the ACL-7125 provides a dependable solution for digital control and monitoring tasks in demanding environments.