After entering the Pass-Through Mode, the host use this command to request the device to start polling for a Type A and Type B PICC until it detects a PICC or times out. This command automatically turns on the RF Antenna.

After NFC Type A card is detected, the device will stop the polling, activate the card and

• Send a notification that identifies the ISO 14443 Type A (Supports ISO 14443-4 protocol). See Notification 0x0301 – Pass-Through Mode Information Update.

• Send another notification with the UID as a payload.

After NFC Type B card is detected, the device will stop the polling, activate the card and

• Send a notification that identifies the ISO 14443 Type B (Supports ISO 144443-4 Protocol). See Pass-Through Mode Information Update - Notification 0x0301

• Send another notification with the UID as a payload.

If the card is not supported, the device will send error notification and stop the polling.

After the NFC Type A or Type B card is activated, the host uses this command to send application-level APDUs to a PICC that supports ISO 14443-4 Protocol. The device sends the PICC response back to the host.

Request Data for Command 0x3003 – ISO 14443-4 APDU Pass-Through Commands

Example (Hex)

The host uses this command to enter or exit Pass-Through Mode.

The Host must “Enter Pass-Through Mode” prior to using any other commands in this section. Otherwise, subsequent commands will be “ignored” / “rejected”. When finished, the Host should “Exit Pass-Through Mode”. Once exited, the reader returns to its “normal state” and will accept traditional commands.

Request Data for Pass-Through Mode Start/Stop - Command 0x3001

Pass-Through Mode is independent and separate from EMVCo Payment functions. This mode provides no access to any EMV payment kernels, and is out of scope from EMVCo certifications.

This mode is typically used by developers that require the need for non-payment low-level APDU communications with NFC cards, tokens, and devices.

The commands in this section provide the basic capability to communicate directly with the non-payment Contactless Card. They provide control of the polling process, and exchange of application protocol data units (APDU).

Typical Use Case examples of overall sequence:

• ENTER Pass-Through Mode.

• Turn ON Polling

• Set/Use LEDs / Buzzer

• “Tap” card/device on reader.

• Engage APDU transmit/ receive activities

• Set/Use LEDs/ Buzzer

• When transaction is completed:

• Turn OFF Polling

• EXIT Pass-Through Mode.

Pass-Through Mode Start/Stop - Command 0x3001

The host uses this command to enter or exit Pass-Through Mode.

The Host must “Enter Pass-Through Mode” prior to using any other commands in this section. Otherwise, subsequent commands will be “ignored” / “rejected”. When finished, the Host should “Exit Pass-Through Mode”. Once exited, the reader returns to its “normal state” and will accept traditional commands.