User's Manual

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3.6.16 Get random number (0x9F)
This command requests a random number from the ICODE TAG. No arguments are required. The ACK
response contains a 16-bit random number. This value should be used with ICODE_SET_PASSWORD
command.
Command description
Argument
Size
Value
Description
Command ID
1
0x9F
ICODE_GET_RANDOM_NUMBER
Response description
ACK
1
0x00
Command ID
1
0x9F
ICODE_GET_RANDOM_NUMBER
Random number
2
XXX
16
-
bits random number
Example:
HOST=>READER: 0x9F – ICODE_GET_RANDOM_NUMBER
READER=>HOST: 0x00 – ACK byte
0x9F – related command code ICODE_GET_RANDOM_NUMBER
0x7F 0x14 – result bytes
3.6.17 Set password (0xA0)
This command sets the password for the selected identifier. This command has to be executed just once
for the related passwords if the TAG is powered. The password is calculated as XOR with the random
number returned by the previously executed command ICODE_GET_RANDOM_NUMBER.
Here is an example how to calculate XOR password:
xorPassword[0] = password[0] ^ rnd[0];
xorPassword[1] = password[1] ^ rnd[1];
xorPassword[2] = password[2] ^ rnd[0];
xorPassword[3] = password[3] ^ rnd[1];
Command description
Argument
Size
Value
Description
Command ID
1
0xA0
ICODE_SET_PASSWORD
Password Identifier 1 X
0x01
–
Read password
0x02 – Write password
0x04 – Privacy password
0x08 – Destroy password
XOR Password
4
X
Response description
ACK
1
0x00
Command ID
1
0xA0
ICODE_SET_PASSWORD