Magtek MagneSafe V5 Reference Manual page 83

DSN – Device Serial Number, this data field will always be fixed at 16 bytes. If the serial
number is less than 15 bytes, it will be left justified. The 16
Cryptogram – Encrypted data, the length of which is always a multiple of 8, this field can be
maximum of 120 characters.
Result codes: 0x00 – success
0x02 – Bad Parameters, the Data Len is not supported
0x07 – Security Level < 2, MSCI CMUT was incorrect.
Section 2. Communications
th
byte will always be set to NULL.
75