Hello,
The PN532 microcontroller has the ReadRegister (D4 06 ADRh ADRl) and WriteRegister (D4 08 ADRh ADRl VAL) commands.
For smart card reader ACS ACR122U, they can be used, for example, as
FF 00 00 00 04 D4 06 63 05
and
FF 00 00 00 04 D4 08 63 05 04
Are there similar commands for the PN512 microcontroller (smart card reader ACS ACR1252U)?