User's Manual

ACG HF Multi ISO RFID Reader V1.0
ACG Identification Technologies GmbH 101
12.4.4.6 Write value block
This command formats a block as a value block containing a 32-bit value. A read is
performed automatically after the write. Value blocks need a complete 16-byte block
due to redundant storage. A successful login is required to run the command.
Command
Command Data
'wv' Value block (1 byte)
Value (4 bytes)
Answer
Answer Description
Data Written value (4 bytes)
'I' Error: value block failure
'F' Error: write failure
'N' Error: No tag in field
'O' Error: Operation mode failure
Example
Command Description
wv05010055EF Writes value 010055EFh to block 5.
12.4.4.6.1 Invalid value 'I'
The value read back after the write value command is not a value block. Data was
written corruptly.
12.4.4.6.2 Write failure 'F'
In addition to the case of a data read failure caused by bad transmission conditions,
this error is returned if a sector is addressed which is not located in the authenticated
area.
12.4.4.6.3 No tag error 'N'
This error is returned if no tag is present or the card does not respond.