1. Product Overview

Product Name: Isolated Analog Output Module for USB
Model: DAI12-4(USB)GY
Series: Intelligent E Series – USB Analog I/O Modules
Article Number: DAI12-4(USB)GY
Manufacturer: CONTEC CO., LTD., Osaka, Japan

The CONTEC DAI12-4(USB)GY is a compact, optically isolated, four‑channel analog output module designed for USB 2.0 connectivity. It provides 12‑bit digital‑to‑analog conversion with selectable voltage and current output ranges. The device is part of CONTEC’s E‑series intelligent analog I/O family, offering high reliability, electrical isolation, and flexible expansion for industrial measurement and control applications. It connects directly to a PC via USB 2.0, enabling high‑speed data transfer and simple installation without requiring internal PC slots.

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2. Key Features

- USB 2.0 Interface: Fully compliant with USB 2.0 specifications, supporting both Full‑Speed (12 Mbps) and High‑Speed (480 Mbps) communication modes.
- Optical Isolation: Complete bus isolation between the PC and external analog circuitry via opto‑couplers, protecting the host system from electrical noise and surges.
- Four Analog Output Channels: Independent 12‑bit D/A converters provide four simultaneous analog outputs.
- Selectable Output Ranges: Software‑configurable voltage and current ranges:
- Voltage: ±10 V, ±5 V, 0–10 V, 0–5 V
- Current: 0–20 mA
- High‑Speed Conversion: 10 µs per channel for voltage output, 20 µs per channel for current output.
- Large Onboard Buffer: 256 K‑word (262,144 data points) memory for cyclic waveform generation and background output independent of PC processing speed.
- Compact and Modular Design: 50.4 × 64.7 × 94 mm housing with integrated DIN‑rail mounting and magnet attachment options.
- Expandable Architecture: Supports up to three DAI12‑4(FIT)GY expansion modules, increasing total output channels to 16.
- Screwless Connectors: Phoenix Contact FK‑MC0.5/12‑ST‑2.5 plug‑in terminals allow tool‑free wiring (AWG 28–20).
- Software Range Setting: Output range and configuration are set entirely through software—no jumpers or hardware switches required.
- Cross‑Platform Driver Support: Includes API‑USBP(WDM) driver library for Windows with sample programs in Visual C++, Visual Basic, Delphi, and C++ Builder.
- Diagnostic and Utility Software: Bundled diagnostic tools verify hardware operation and assist in troubleshooting.
- Safety and Reliability: Designed for industrial environments with 0–50 °C operating temperature, 10–90 % RH humidity tolerance, and opto‑isolated circuitry.

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3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Analog Output Type | Bus‑isolated voltage/current output |
| Channels | 4 |
| Resolution | 12 bits |
| Output Ranges | Voltage: ±10 V, ±5 V, 0–10 V, 0–5 V; Current: 0–20 mA |
| Output Impedance | ≤ 10 Ω (voltage mode) |
| Output Drive Capability | ±5 mA (voltage), 0–20 mA (current) |
| Conversion Accuracy | ±3 LSB (voltage), ±5 LSB (current) |
| Settling Time | 10 µs (voltage), 20 µs (current) |
| Data Buffer Memory | 256 K data (262,144 words) |
| Sampling Timer Range | 10 µs – 1,073,741,824 µs (10 µs – ~1073 s) |
| Communication Interface | USB 2.0 Full‑Speed (12 Mbps) / High‑Speed (480 Mbps) |
| Power Supply | +5 V DC ± 5 % (via included AC adapter) |
| Current Consumption | 700 mA (max) |
| Operating Temperature | 0 – 50 °C |
| Operating Humidity | 10 – 90 % RH (non‑condensing) |
| Isolation Method | Opto‑coupler isolation between USB bus and analog circuitry |
| Dimensions (W × D × H) | 50.4 × 64.7 × 94.0 mm (excluding protrusions) |
| Weight | Approx. 100 g |
| Mounting | 35 mm DIN‑rail or magnetic mounting |
| Connectors | FK‑MC0.5/12‑ST‑2.5 (Phoenix Contact), 2.5 mm pitch, 4 A max |
| Applicable Wire Size | AWG 28 – 20 (0.08 – 0.51 mm²) |
| Maximum Modules per System | 127 USB modules (theoretical USB limit) |
| Expansion Modules | Up to 3 × DAI12‑4(FIT)GY (adds 12 channels) |
| Compliance | USB 2.0 specification, CE marking (manufacturer standard) |

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4. Functionality

The DAI12‑4(USB)GY performs digital‑to‑analog conversion for control and signal generation tasks. Each of the four channels can output either voltage or current signals, selectable via software. The module’s internal microprocessor manages timing, buffering, and communication with the host PC through the USB interface.

Operation Principle:
1. The host PC sends digital output data and configuration commands via the USB 2.0 link.
2. The onboard CPU stores up to 256 K samples in local memory.
3. The internal sampling timer triggers D/A conversion at user‑defined intervals (10 µs – ~1073 s).
4. Converted analog signals are output simultaneously across all active channels.
5. Opto‑isolation ensures that external electrical noise or ground potential differences do not affect the PC.

Typical Applications:
- Industrial process control and instrumentation
- Laboratory signal generation and waveform output
- Automated test systems (ATE)
- Data acquisition and control for research and development
- Educational and training systems requiring analog signal output
- Portable measurement setups using notebook PCs

Compatibility:
- Works with any PC equipped with USB 2.0 or 1.1 ports.
- Compatible with Windows 98/Me/2000/XP (32‑bit).
- Supports programming via Visual C++, Visual Basic, Delphi, C++ Builder, and .NET languages.

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5. Components & Accessories

Included Items:
- DAI12‑4(USB)GY main module
- AC adapter (POA‑AD22, 90–264 V AC → 5 V DC 2 A, 1.4 m cable)
- USB cable (1.8 m)
- Two FK‑MC0.5/9‑ST‑2.5 interface connector plugs
- CD‑ROM (API‑USBP(WDM) driver library and utilities)
- Protective rubber feet × 4
- Mounting magnets × 2
- User’s Guide (booklet)

Optional Accessories:
- Expansion Modules: DAI12‑4(FIT)GY (4 channels each, up to 3 modules)
- Power Supplies:
- POW‑AD13GY (AC 85–132 V → 5 V DC 3 A)
- POW‑AD22GY (AC 85–265 V → 5 V DC 2 A)
- POW‑AD25GY (AC 85–264 V → 5 V DC 4.6 A @ 230 V)
- POW‑DD10GY (DC 10–30 V → 5 V DC 3 A)
- DIN‑rail mountable power supplies with Phoenix Contact MC1.5/3‑ST‑3.5 connectors.
- Software Tools: API‑USBP(WDM) library, diagnostic utility, sample programs.

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6. Installation & Setup

Requirements:
- IBM PC/AT‑compatible computer with available USB port
- Windows 98/Me/2000/XP operating system
- Administrator privileges for driver installation

Installation Steps:
1. Connect Power: Attach the supplied AC adapter or optional DIN‑rail power supply.
2. Connect USB Cable: Plug the module into the PC’s USB port. Windows automatically detects the device.
3. Install Driver: Insert the supplied CD‑ROM and install the API‑USBP(WDM) driver when prompted.
4. Set Device Name: In Windows Device Manager, assign a unique device name under “CONTEC Devices.”
5. Verify Operation: Use the diagnostic utility to confirm communication and output functionality.

Mounting Options:
- DIN‑Rail Mounting: Integrated 35 mm DIN clip allows one‑touch installation.
- Magnetic Mounting: Two included magnets permit attachment to metal surfaces such as panels or desks.
- Stacked Expansion: Up to three DAI12‑4(FIT)GY modules can be stacked using built‑in locking connectors.

Module Identification:
- Module ID: Rotary switches (x16 and x1) set hexadecimal ID (00–7Fh) for multiple identical modules.
- Device ID: Expansion modules use IDs 1–3 to define channel order.

Connection to External Devices:
- 12‑pin Phoenix Contact connector provides channel outputs:
- CH0–CH3 Voltage (V) and Current (C) outputs with AG (analog ground).
- Supports both voltage output (to high‑impedance loads) and current loop control (0–20 mA with ≤ 500 Ω load).
- Use shielded or coaxial cables for noise‑sensitive environments.

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7. Performance & Capabilities

- Conversion Speed: 10 µs per channel (voltage), 20 µs per channel (current).
- Minimum Output Cycle: ~400 µs (single channel) to 1 ms (16 channels with expansion).
- Buffer Operation: 256 K FIFO or ring buffer enables continuous cyclic waveform output.
- Synchronization: All four channels update simultaneously for synchronous signal generation.
- Accuracy: ±3 LSB (voltage), ±5 LSB (current) at 25 °C.
- Isolation Voltage: Opto‑coupler isolation between USB bus and analog section prevents ground loops.
- Noise Immunity: Designed for industrial environments with robust filtering and shielded connectors.
- Scalability: Up to 16 channels with three expansion modules controlled by a single USB port.
- Reliability: Continuous operation supported within 0–50 °C ambient temperature.

Limitations:
- Not compatible with non‑Windows OS (Linux, macOS).
- Maximum USB cable length 5 m (extendable to 30 m via powered USB hubs).
- Expansion modules must be of the same type (DAI12‑4(FIT)GY).

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8. Standards & Compliance

- USB 2.0 Specification: Full compliance with USB 2.0 (Full Speed and High Speed modes).
- Electrical Isolation: Opto‑isolated bus interface protects host PC from external surges.
- Safety and Environmental Conditions:
- Operating temperature 0–50 °C
- Humidity 10–90 % RH (non‑condensing)
- No corrosive gases or excessive dust
- Regulatory Compliance: CE mark (manufacturer standard), RoHS compliant materials.
- Industry Standards: Compatible with E‑series signal conditioning and DIN rail mounting systems.

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9. Additional Information

Warranty:
One‑year limited warranty against defects in materials and workmanship. Warranty covers electronic circuitry only; damage from misuse or modification is excluded. Repairs require Return Merchandise Authorization (RMA) and proof of purchase.

Support & Service:
- Technical Support: Available through CONTEC group offices and authorized distributors.
- Online Resources: Drivers, sample programs, and manuals downloadable from [www.contec.com](http://www.contec.com).
- Firmware Updates: Upgradeable via firmware utility when new versions are released.
- Diagnostic Tools: Built‑in diagnostic program verifies hardware status and output accuracy.
- Maintenance: Periodic inspection recommended to ensure ventilation slots are clear and connectors secure.

Safety Precautions:
- Do not operate in flammable or corrosive environments.
- Avoid connecting or disconnecting wiring while powered.
- Ensure adequate ventilation to prevent overheating.
- Use only the supplied or approved power supplies.

Software Environment:
- Driver Library: API‑USBP(WDM) for Windows 98/Me/2000/XP.
- Supported Languages: Visual C++ 5.0/6.0/.NET, Visual Basic 5.0/6.0/.NET, C# .NET, Delphi 5/6, C++ Builder 5/6.
- Utilities: Diagnostic program, sample applications, and online help included.
- Distribution: Applications developed with API‑USBP(WDM) may be freely distributed without runtime license fees.

Expansion and Integration:
- Expansion modules connect via stack locking mechanism with Device IDs 1–3.
- Power supplies and modules mount on DIN rails for compact industrial installations.
- Compatible with other CONTEC E‑series analog I/O and digital I/O modules for integrated measurement systems.

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Summary

The CONTEC DAI12‑4(USB)GY is a high‑performance, optically isolated, four‑channel 12‑bit analog output module for USB 2.0 interfaces. It combines industrial‑grade signal integrity with the portability and ease of USB connectivity. With software‑selectable voltage and current ranges, a 256 K‑word data buffer, and support for up to 16 channels via expansion, it is ideal for laboratory automation, process control, and data acquisition applications. Bundled drivers and sample programs simplify integration into Windows‑based systems, while DIN‑rail mounting and screwless connectors facilitate rapid installation in industrial environments. The module’s robust isolation, compact form factor, and comprehensive software support make it a versatile solution for engineers and system integrators requiring precise and reliable analog signal generation over USB.