Introduction
The Advanced Card Systems (ACS) ACR39U-NF PocketMate II is a compact USB-C smart card reader designed for various smart card applications. This device provides secure and reliable functionality for accessing smart card-based systems. This manual provides instructions for the proper setup, operation, maintenance, and troubleshooting of your ACR39U-NF smart card reader.
Safety Information
- Do not expose the device to extreme temperatures, direct sunlight, or high humidity.
- Avoid dropping or subjecting the device to strong impacts.
- Do not attempt to disassemble or modify the device. This will void the warranty and may cause damage.
- Keep the device away from liquids. If liquid enters the device, discontinue use immediately.
- Use only with compatible smart cards and USB-C ports.
Package Contents
Verify that your package contains the following items:
- ACR39U-NF PocketMate II USB-C Smart Card Reader
- Quick Start Guide (if included)
Product Overview
The ACR39U-NF PocketMate II is designed for portability and ease of use. It features a durable casing and a USB-C connector for modern devices.

Setup
1. Driver Installation
The ACR39U-NF is generally a plug-and-play device for most modern operating systems, including Windows, Linux, and macOS. Drivers are typically installed automatically upon connection. For Android devices, specific applications or SDKs may be required for full functionality. Refer to the ACS website for the latest driver information or SDKs if automatic installation does not occur or if you require specific software.
2. Connecting the Device
- Locate an available USB-C port on your computer or compatible Android device.
- Insert the USB-C connector of the ACR39U-NF PocketMate II into the USB-C port. Ensure it is fully seated.
- The device should be recognized by your operating system. A status indicator (if present) may light up.

Operating Instructions
Inserting a Smart Card
- Gently open the reader to expose the smart card slot.
- Orient your smart card with the gold contact chip facing upwards and towards the reader.
- Slide the smart card into the slot until it is fully inserted and securely seated. Do not force the card.
- The reader will detect the card, and your operating system or application should indicate its presence.

Removing a Smart Card
Before removing the smart card, ensure that no applications are actively using it. Gently pull the smart card straight out from the slot. Avoid bending or twisting the card during removal.
Using with Applications
The ACR39U-NF is compatible with various smart card applications, including those for digital signatures, online banking, and secure login. The specific steps for using the reader will depend on the application you are using. Consult the documentation for your smart card application for detailed instructions.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use abrasive cleaners or solvents. Avoid getting moisture into the card slot or USB-C connector.
- Storage: When not in use, store the reader in a clean, dry place, away from dust and extreme temperatures. The compact design allows for easy storage.
- Handling: Handle the device carefully to prevent damage to the USB-C connector or the internal card contacts.
Troubleshooting
- Device Not Recognized:
- Ensure the USB-C connector is fully inserted into the port.
- Try a different USB-C port on your computer or device.
- Restart your computer or device.
- Check if drivers are properly installed. Visit the ACS website for driver downloads if necessary.
- Smart Card Not Detected:
- Ensure the smart card is inserted correctly with the chip facing up and fully seated.
- Check if the smart card is damaged or dirty. Clean the chip with a soft, dry cloth if needed.
- Verify that the smart card is compatible with the reader and your application.
- Try another smart card if available to rule out a card issue.
- Application Errors:
- Ensure your smart card application is up-to-date.
- Consult the documentation or support for your specific smart card application.
Specifications
| Brand | Advanced Card Systems |
| Model Number | ACR39U-NF |
| Operating System Compatibility | Windows, Linux, macOS, Android EVK, Android |
| Item Weight | 0.8 ounces |
| Product Dimensions (LxWxH) | 2.25 x 0.75 x 0.5 inches |
| Connector Type | USB Type-C |
| Manufacturer | ACS |
Warranty and Support
For warranty information and technical support, please refer to the official Advanced Card Systems (ACS) website or contact their customer service. Keep your purchase receipt as proof of purchase for warranty claims.