RFID / NFC Access

Applies to: Emiko platform, RFID / NFC access

Audience: Customers & partners

Last updated: 2026-01-25

Purpose

This article explains how RFID / NFC credentials are used in the Emiko system, including how access works locally and offline, and how card IDs must be stored to function correctly.

It exists to ensure:

• correct enrollment of RFID / NFC credentials

• predictable access behavior

• understanding of offline operation

• correct storage of card IDs in Emiko

1. RFID / NFC Technology Used in Emiko

Emiko uses RFID technology operating at 13.56 MHz, also commonly referred to as:

• RFID (High Frequency)

• NFC (Near Field Communication)

These terms describe the same underlying technology and are often used interchangeably.

2. How RFID / NFC Access Works in Emiko

Emiko access control is designed to work locally at the equipment, without depending on a live network connection.

Normal operation

• Emiko distributes the access list to the GSM controller installed in the equipment

• The GSM controller stores this access list locally

• When a card is presented:

  • The RFID reader reads the card ID

  • The GSM controller validates the card locally

  • Access is granted or denied immediately

Offline operation (Key benefit)

If GSM, WiFi, or internet is unavailable:

• The GSM controller continues to:

  • read RFID / NFC cards

  • validate access locally

  • activate services (e.g. power outlets)

RFID / NFC access continues to work even when the network is down.

Important notice

Changes in Emiko are not applied instantly.

It can take up to 20 minutes for changes to take effect, including:

• adding customers

• adding or assigning RFID / NFC keys

• changing access rights

• updating validity periods (From / To)

For changes to be distributed, the GSM device must be online.

If the device is offline, updates will be applied when it comes online again.

3. What Is Read from an RFID / NFC Card

From each card or key, the system reads:

• the unique card identifier (UID / CSN) only

The system does not read:

• cardholder name

• stored value

• access rights stored on the card

• application data

All access rules are defined and distributed via Emiko.

4. How Card IDs Are Converted and Stored (Important)

When a card is read, the system automatically:

• reads the card’s unique identifier

• converts it to a standard internal format

• stores the value as an uppercase hexadecimal (HEX) string

This conversion is automatic and always consistent.

What this means

• Card IDs must be stored exactly as the HEX value

• Matching is exact

• Formatting must not be changed

Example

After reading a card, the ID is represented as:

078C68BB

This exact value must be stored in Emiko.

5. Adding RFID / NFC Keys in Emiko

RFID / NFC keys must be registered in Emiko before they can be used for access.

Required: USB RFID / NFC Reader

To register a card or key, a USB RFID / NFC reader connected to a PC is used.

The USB reader is used to:

• read the card’s unique identifier (UID)

• display the UID as a HEX value

Saving the key in Emiko

The following steps are required:

1. Read the card using the USB reader

2. Copy the HEX value exactly as shown

3. Save this value in Emiko RFID Management

4. Assign access rights as required

Only keys saved in Emiko will be distributed to the equipment and allow access.

6. USB Table Reader for Enrollment (Optional)

We offer a compatible USB RFID / NFC table reader for administration and onboarding.

The reader:

• operates at 13.56 MHz (RFID / NFC)

• reads card UID only

• is pre-configured to match Emiko’s requirements

If supplied by us, the reader is:

• ready to use

• tested with Emiko

• suitable for batch enrollment and office setup

7. Key Takeaway

• RFID / NFC access is validated locally in the equipment

• Card IDs must match the HEX value stored in Emiko

• Access continues to work offline

• Changes may take up to 20 minutes and require the device to be online