Magtek MagneSafe V5, Reference Manual

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MagneSafe V5
72
Example Response Read Oldest Transaction (Hex):
Result Code Data Len Data
00 00
Erase Oldest Transaction Command (Flash Reader Only)
Command number: 0x18
Description: This command is used to erase the oldest transaction (card swipe) stored in
the reader. It has no request and no response data. The response indicates
whether or not a transaction was erased. If there are no stored
transactions, the request will fail indicating no stored transactions. If there
is a stored transaction but it has not been read (using the
Read Oldest
Transaction command) since the most recent power up, the request will
fail indicating the transaction must be read before it can be removed.
Data structure:
Request Data: None
Response Data: None
Result codes:
0x00 (Success, a transaction was erased)
0x01 (Failure, no transactions to erase)
0x07 (Sequence error, transaction must be retrieved before erasure)
Example Request
Erase Oldest Transaction (Hex):
Cmd Num Data Len Data
18 00
Example Response
Erase Oldest Transaction (Hex):
Result Code Data Len Data
00 00
Get Encryption Counter Command
Command number: 0x1C
Description: This command is used to Get the Encryption Counter. The Encryption
Counter gives the maximum number of transactions that can be performed
by the reader. A transaction is either an encrypted card swipe or a
correctly completed Activation Sequence (Activate Authenticated Mode
followed by correct Activation Challenge Reply).
The Encryption Counter has three possible states:
1. Disabled – value 0xFFFFFF – In this state there is no limit to the number of
transactions that can be performed.
2. Expired – value 0x000000 – This state indicates that all transactions are prohibited
3. Active – value 1 to 1,000,000 (0x000001 to 0x0F4240) – In this state, each
transaction causes the Encryption Counter to be decremented and allows transactions
to be processed. If an Activation Sequence decrements the Encryption Counter to 0, a
last encrypted card swipe will be permitted.