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Option byte
The option byte defines general behavior of the command.
Note that ISO 14443 tags are only working in selected mode.
Bit
Description
7
If set the user mode is used and the MAC is calculated and
added to the frame.
If not set the issuer mode is used sector index and access
conditions are included and no MAC is calculated.
6
If set the tag is in addressed mode. The UID is following as
first 8 bytes after the option byte. The my-d frame is
following.
5
If set the tag is selected. No UID is needed.
4-0
RFU
Key index
Defines the reader key index. If the index exceeds the key index of the reader the
error ‘R’ out of range is thrown. The key index is zero based.
Destination page
Defines the transponder page index. Lower byte of the page number is sent first.
Sector index and access conditions
In issuer mode the sector index and the access conditions are added.
12.4.6.4
Prepare for KTT
This command sets the reader into KTT awareness mode.
Command
Command
Data
‘ut’
Key page (1 byte)
Key index (1 byte)
Counter page (2 bytes)
Diversification data (8 bytes)
Answer
Use the check KTT upload status ‘!’ command to finish the upload procedure.