Vimar 03925, Руководство по установке

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6.2.8 Password authentication (PWD_AUTH) command
The protected memory area can be accessed only after successful password verification via the PWD_AUTH command.
The PWD_AUTH command takes the password as parameter and, if successful, returns the password authentication acknowledge, PACK.
Figure 23 below shows the password authentication sequence.
NFC Reader NFC Tag
Cmd Pwd
623 µs
57 µs
368 µs T
ACK
T
NAK
CRC
NAK
“ACK”
“NAK”
CRC PACK
After successful authentication, the password can be changed by writing the new password to memory page 0xE5.
Note that a read access to page 0xE5 always return 0x00000000, i.e. it is not possible to read out the current PIN code.
6.3 Configuration memory organization
The 03925 configuration memory is divided into the following areas:
■
Public data
■
Protected data
In addition to that, 03925 maintains a private configuration memory region used to store default parameters and confidential information which is not accessible to
the user.
Figure 24 below illustrates the configuration memory organization used by 03925.
NFC access
without PIN
NFC access
with PIN
Public Data Read-only Read-only
Product Name ("PTM 215B")
Product ID
Manufacturer ID
Source Address
Sequence Counter
Revision (HW / SW / NFC)
Product Data No access Read / Write
Source Address Write
Manufacturer ID Write
Product ID Write
Security Key Write
Optional Data
Configuration
Custom Variant
Custom Radio Channel
Custom NFC Data
Private Data
No access No access
Security Key
Default Setting
NFC interface
Figure 23 – Password authentication sequence
Figure 24 – Configuration memory organization