1. Introduction
This manual provides detailed instructions for the safe and efficient use of your Deftun MINIDX3 Portable USB Card Reader. The MINIDX3 is a compact device designed for reading magnetic stripe cards, compatible with MSR605X, MSRX6, and MSRX6BT systems. It is suitable for various applications including point-of-sale, attendance tracking, and data collection.
2. Package Contents
Verify that all items listed below are present in your package:
- 1x MINIDX3 Reader
- 1x Software CD
- 1x USB Cable
- 1x Rope (Lanyard)

Image showing the MINIDX3 Portable USB Card Reader, a USB cable, a software CD, and a lanyard.
3. Setup Instructions
- Charge the Device: The MINIDX3 includes a 3.7V 250 MAH rechargeable battery. Connect the device to a computer or USB power adapter using the provided USB cable to charge it before first use.
- Software Installation: Insert the included Software CD into your computer's CD-ROM drive. Follow the on-screen instructions to install the necessary drivers and software. If your computer does not have a CD drive, drivers may be available for download from the manufacturer's website.
- Connect to Computer: Once the software is installed, connect the MINIDX3 reader to your computer via the USB cable. The system should recognize the device automatically.
4. Operating Instructions
The MINIDX3 is designed for straightforward operation without complex programming.
- Power On: Press the power button on the device to turn it on. A low battery indicator will alert you when charging is required.
- Reading Magnetic Cards: Gently swipe a magnetic stripe card through the reader slot. The device can read all three tracks of 300-4000 OE (Lo-co and Hi-co) magnetic cards. Ensure the magnetic stripe faces the reader head.
- Data Transfer: After reading cards, connect the MINIDX3 to your computer via USB. The collected data can be downloaded to your computer using the installed software, compatible with MSR605X, MSRX6, and MSRX6BT systems.
- Auto Power Off: The device features an auto power-off function, which can be configured by the user to conserve battery life.
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Avoid using liquid cleaners or solvents.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the battery frequently. Recharge the device regularly, especially if it will be stored for an extended period.
6. Troubleshooting
- Device Not Recognized:
- Ensure the USB cable is securely connected to both the device and the computer.
- Verify that the drivers and software are correctly installed.
- Try connecting to a different USB port on your computer.
- Unable to Read Cards:
- Ensure the magnetic stripe is facing the correct direction during the swipe.
- Swipe the card at a consistent speed.
- Check if the card's magnetic stripe is damaged.
- Low Battery Indication:
- Connect the device to a power source using the USB cable to recharge the battery.
7. Technical Specifications
| Feature | Specification |
|---|---|
| Dimensions | L 1.6 x W 0.8 x H 1.2 inches (L 4.7 x W 2.2 x H 3.1 cm) |
| Net Weight | 25g (0.88 oz) |
| Battery Power | 3.7V 250 MAH Rechargeable Lithium Ion Battery |
| Working Temperature | 0~55°C (32~131°F) |
| Storage Temperature | -10~55°C (14~131°F) |
| Humidity | 10~90% Relative Humidity |
| Communication | USB |
| Magnetic Card Compatibility | 300-4000 OE (Lo-co and Hi-co), all three tracks |
| Data Storage | 2M bytes (approximately 8000 3-track records) |
| Model Number | dx3001 |
8. Warranty and Support
For warranty information or technical support, please refer to the documentation provided with your purchase or contact Deftun customer service through their official channels.





