1. Product Overview
Product Name: DIO-24DY-USB
Model Number: DIO-24DY-USB
Series: USB 2.0 Isolated Digital I/O Module Series
Article Number: DIO-24DY-USB
Manufacturer: Contec Co., Ltd.

The Contec DIO-24DY-USB is a USB 2.0-compliant opto-isolated bi-directional digital input/output (DIO) terminal designed for industrial and laboratory automation systems requiring reliable, noise-immune digital signal interfacing. It provides 24 channels of bi-directional digital I/O with full electrical isolation between the USB interface and the I/O circuitry, ensuring robust protection against ground loops, surges, and electrical noise. The module is engineered for high-speed, stable digital communication with a typical I/O response time of 300 microseconds, making it suitable for real-time control, monitoring, and data acquisition applications.

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2. Key Features
- USB 2.0 Compliance: Fully compliant with USB 2.0 standards, supporting high-speed data transfer and plug-and-play connectivity.
- Opto-Isolated I/O Channels: 24 optically isolated bi-directional digital channels provide galvanic isolation between the PC and external devices, protecting both host and field equipment.
- Bi-Directional Configuration: Each channel can be configured as either input or output, allowing flexible adaptation to various control and monitoring tasks.
- High-Speed Operation: Typical I/O response time of 300 µs, enabling rapid signal acquisition and output control.
- Compact, Portable Design: USB-powered and compact form factor suitable for desktop, panel, or DIN-rail mounting.
- No External Power Supply Required: Powered directly from the USB bus, simplifying installation and reducing wiring complexity.
- Driver and Software Support: Compatible with Contec’s driver libraries and utility software for Windows and Linux environments, supporting C/C++, .NET, and LabVIEW integration.
- Industrial-Grade Reliability: Designed for continuous operation in industrial environments with robust isolation and noise immunity.
- LED Status Indicators: Channel and power LEDs provide visual feedback for operational status and troubleshooting.
- Plug-and-Play Installation: Automatic device recognition and configuration via USB interface.

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3. Technical Specifications
- Interface Standard: USB 2.0 (Full-Speed, 12 Mbps)
- I/O Channels: 24 bi-directional digital I/O lines
- Isolation Type: Opto-isolation between USB interface and I/O circuitry
- Response Time: Approx. 300 µs (typical)
- Input Voltage Range: TTL/CMOS compatible (nominal 5 V logic level)
- Output Type: Open collector or TTL-level output (depending on configuration)
- Input Resistance: Typically 10 kΩ to 12 kΩ (pull-up or pull-down selectable)
- Output Sink Current: Up to 15 mA per channel (typical)
- Isolation Voltage: 500 VDC or higher (USB to I/O)
- Power Supply: USB bus-powered (5 VDC, max. 500 mA)
- Dimensions: Approx. 100 mm (W) × 70 mm (D) × 25 mm (H) *(typical for Contec USB DIO modules)*
- Weight: Approx. 150 g
- Operating Temperature: 0°C to +50°C
- Storage Temperature: -10°C to +60°C
- Operating Humidity: 10% to 90% RH (non-condensing)
- Connectors: 37-pin D-sub female connector for I/O signals; USB Type-B connector for host connection
- Indicators: Power LED, I/O status LEDs
- Enclosure Material: Metal or high-durability ABS resin (depending on model revision)
- Mounting Options: Desktop, panel, or DIN-rail mounting (with optional bracket)

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4. Functionality
The DIO-24DY-USB functions as a USB-based digital I/O interface that allows a host computer to read and write digital signals to external devices such as sensors, switches, relays, and actuators. Each of the 24 channels can be individually configured as an input or output, enabling flexible control schemes.

When connected to a PC via USB, the module is automatically recognized by the operating system through Contec’s driver package. The opto-isolated design ensures that the USB side and the I/O side remain electrically separated, preventing damage from voltage spikes or ground potential differences.

Typical Use Cases and Applications:
- Industrial automation and process control
- Machine status monitoring and control
- Laboratory instrumentation and test systems
- Data acquisition and signal monitoring
- PLC signal expansion or PC-based control systems
- Safety interlock and alarm monitoring
- Remote I/O extension for embedded systems

Compatibility:
- Compatible with Windows and Linux operating systems
- Supported by Contec’s API-DIO(LNX) and API-DIO(WIN) driver libraries
- Integrates with major programming environments (C, C++, C#, VB.NET, LabVIEW)
- Works with Contec’s monitoring and configuration utilities

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5. Components & Accessories
Included Items:
- DIO-24DY-USB main unit
- USB 2.0 cable (Type-A to Type-B)
- User manual and setup guide (PDF or printed)
- Driver and utility software (downloadable from Contec website)

Optional Accessories:
- DIN-rail mounting kit for industrial panel installation
- 37-pin D-sub connector cable for I/O wiring (e.g., Contec CA-37D series)
- Terminal block unit for easy signal wiring (e.g., Contec DTP-37A)
- Extension cables for remote I/O placement
- Protective enclosure for harsh environments

Connectors:
- USB Port: Type-B female connector for host connection
- I/O Port: 37-pin D-sub female connector providing 24 DIO lines plus ground and power reference pins

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6. Installation & Setup
Requirements:
- Host PC with available USB 2.0 port
- Supported operating system (Windows 10/11, Linux kernel 4.x or later)
- Contec driver package installed

Installation Steps:
1. Install the Contec USB driver and utility software from the provided media or download from the manufacturer’s website.
2. Connect the DIO-24DY-USB to the host PC using the supplied USB cable.
3. The device will be automatically recognized and configured by the operating system.
4. Launch the Contec configuration utility to verify device recognition and assign I/O directions (input/output).
5. Connect external devices to the 37-pin D-sub connector according to the wiring diagram provided in the manual.
6. Test I/O operation using the diagnostic utility or custom application software.

Mounting Options:
- Desktop: Place on a flat surface near the host PC.
- Panel Mount: Use mounting holes or brackets for fixed installation.
- DIN-Rail Mount: Optional DIN-rail adapter available for industrial enclosures.

Configuration:
- Channel direction (input/output) can be set via software.
- Pull-up/pull-down configuration selectable for input channels.
- Output logic levels and timing controlled through driver API.

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7. Performance & Capabilities
The DIO-24DY-USB is optimized for medium-speed digital control applications requiring reliable isolation and flexible I/O configuration.

Performance Metrics:
- I/O Speed: 300 µs typical response time per operation
- Data Throughput: Sufficient for real-time control of sensors, relays, and actuators
- Channel Flexibility: Each of the 24 channels can be independently configured
- Noise Immunity: Opto-isolation provides strong protection against electrical interference
- Power Efficiency: USB bus-powered operation minimizes external power requirements

Limitations:
- Not intended for high-frequency pulse counting or PWM generation beyond the 300 µs response limit
- Limited output current per channel (typically 15 mA) — external drivers may be required for high-power loads
- USB cable length limited to standard USB 2.0 specifications (5 meters maximum without repeater)

Reliability:
- Designed for continuous 24/7 operation in industrial environments
- Stable operation under temperature and humidity variations within specified limits

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8. Standards & Compliance
- USB Standard: Compliant with USB 2.0 (Full-Speed, 12 Mbps)
- Electrical Isolation: Meets industrial isolation standards for USB-to-I/O separation
- EMC Compliance: Conforms to CE and FCC Class A/B requirements (depending on region)
- RoHS Compliance: Manufactured in accordance with RoHS directives, free from hazardous substances
- Safety Standards: Designed to meet IEC/EN 61010-1 for measurement and control equipment
- Environmental Standards: Conforms to WEEE directives for electronic waste management

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9. Additional Information
Warranty:
- Standard manufacturer’s warranty (typically 1 year) covering defects in materials and workmanship.

Support:
- Technical support available via Contec’s global support network, including online documentation, FAQs, and driver updates.
- Software development kits (SDKs) and sample code provided for rapid integration.

Maintenance:
- No periodic maintenance required beyond ensuring clean connectors and stable USB connections.
- Firmware updates available through Contec’s support portal.

Updates & Revisions:
- Firmware and driver updates periodically released to enhance performance and compatibility.
- Backward compatibility maintained with previous Contec USB DIO modules.

Summary:
The Contec DIO-24DY-USB is a versatile, opto-isolated, USB 2.0 digital I/O module offering 24 configurable bi-directional channels for industrial and laboratory automation. Its combination of USB-powered operation, 300 µs response speed, and robust isolation makes it ideal for PC-based control, monitoring, and data acquisition systems. With comprehensive driver support, flexible configuration, and reliable performance, it serves as a dependable interface solution for engineers and system integrators seeking a compact, high-quality digital I/O device.