VHL.GetSnr
This command returns the serial number (UID) of the currently selected card. The UID is the number sent when the card is selected; this may also be a random ID.
If VHL.Select hasn't been executed successfully before, the reader will return VHL.ErrCardNotSelected. If the last selected card is no longer available in the antenna field, or a read/write operation failed previous to this command, the returned serial number is undefined.
Don't make security-critical decisions by only examining the card's serial number.
Properties
- Command code: 0x0101
- Command timeout: 100 ms
- Possible status codes: General status codes, VHL.ErrCardNotSelected, VHL.ErrHw
Parameters (request frame)
None
Returned values (response frame)
| Name | Type/Size | Description |
|---|---|---|
| Snr | Raw data (until end of frame) | Serial number (UID) of the card. The length of this field depends on the selected card type. |