User's Manual

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5.5.17 Get value (0x70)
This command returns the value stored in a value file on the TAG. The returned ACK response contains 4 bytes
of signed value, LSB-first.
Command description
Argument
Size
Value
Description
Command ID
1
0x70
MFDF_GET_VALUE
File number
1
X
File number
inside application
Response description
ACK
1
0x00
Command ID
1
0x70
MFDF_GET_VALUE
Value
4
X
4 bytes signed value, LSB first
Example:
HOST=>READER: 0x70 – MFDF_GET_VALUE
0x02 – file number
READER=>HOST: 0x00 – ACK byte
0x70 – related command code MFDF_GET_VALUE
0x05 0x00 0x00 0x00 – 4 bytes signed value, LSB
first
5.5.18 Credit file (0x71)
This command increases a value stored in a value file on the TAG.
Command description
Argument
Size
Value
Description
Command ID
1
0x71
MFDF_CREDIT
File number
1
X
File number inside application
Credit value
4
X
4 bytes signed value, LSB first
Response description
ACK
1
0x00
Command ID
1
0x71
MFDF_CREDIT
Example:
HOST=>READER: 0x71 – MFDF_CREDIT
0x02 – file number
0x05 0x00 0x00 0x00 – 4 bytes signed value, LSB
first
READER=>HOST: 0x00 – ACK byte
0x71 – related command code MFDF_CREDIT
5.5.19 Credit file (0x72)
This command allows a limited increase of a value stored in a value file without having full credit permissions
to the file. Please refer to the NXP documentation for more information.