User's Manual

ACG HF Multi ISO RFID Reader V1.0
ACG Identification Technologies GmbH 93
12.4.4 ISO 14443 Type A (mifare
®
) only commands
12.4.4.1 Increment value block (credit)
Increments a value block with a defined value. A read is done automatically after a
write to verify data integrity. The command fails if the source block is not in value
block format. A previous login is needed to access a block.
Command
Command Data
'+' Block (1 byte)
Value (4 bytes)
Answer
Answer Description
Data Value (4 bytes)
'I' Error: value block failure
'F' Error: increment failure
'N' Error: No tag in field
'O' Error: Operation mode failure
Example
Command Description
+0400000001 Adds 1 to value block 4
+0500000100 Adds 256 to value block 5
12.4.4.1.1 No value block 'I'
Specified block does not match the value format. The value block is corrupted. A
backup block can be used to restore the correct value.
12.4.4.1.2 Increment failure 'F'
This indicates a general failure during the increment procedure or an inability to read
after the write process.