How to use an NFC card reader to read the UID of an NFC card

Method 1:
APDU command ffca000000 read uid
Acr122u APDU command
<FF ca 00 00
> 04 76 BF E1 BF 02 80 90 00

Method 2:
Because the UID of the Mifare ultralight card is in the first page and second page of the card, we can directly read
You can retrieve one page 2 data.
Acr122u read page
<FF B0 00 04
> 04 76 BF 45 90 00
> Data read at start page 00
> Number of bytes read: 04
> Hex mode: 04 76 BF 45
Acr122u read page
<FF B0 00 01 04
> E1 BF 02 80 90 00
> Data read at start page 01
> Number of bytes read: 04
> Hex mode: E1 BF 02 80
Reference 1:
APDU "Read Binary blocks command" refer to "acr122u NFC reader apicks" 5.3 Read Binary
Blocks chapter
APDU "Get uid APDU" refer to 4.1 PICC commands for general in "acr122u NFC reader api.pdf"
Purposes chapter
Reference 2:
What is a unique identifier number and what is it used?
ISO/IEC 14443 Type A defines a unique identifer to be used for card selection and activation.
The standard defines single, double and triple size UIDs which correspondingly consist of 4, 7
And 10 byte. In bytes contactless systems, the UID is not only used for card activation but also
As a logical reference I. e. in a background system to the card itself
Mifare ultralight C
Unique 7 bytes serial number (UID)
Mifare plus
7 or 4 bytes uid. Optional supporting random uid