Hello Ake,
The corresponding command list you want is standard, you can find them in ISO/IEC 14443 Type A Specification. But according to your situation, you don't need to know command list.
At first, you should know the type of your reader( such as MFRC522 or MFRC531) and card IC(such as MF0ICU1 or others)
then consult reader's and card IC's datasheet / reference manual / application, you will know the value's meaning of registers.
Best Regards,
Weidong