ACS ACR38K Smart Keyboard - Manual (Page 48)

ACR38x (CCID) – Reference Manual [email protected]
Version 6.04 www.acs.com.hk
Page 48 of 58
9.3.8.5. VERIFY_USER_CODE
This command is used to submit User Code (2 bytes) to the inserted card. User Code is to enable the
memory access of the card.
The following actions are executed:
1. Present the specified code to the card.
2. Search a '1' bit in the presentation error counter and write the bit to '0'.
3. Erase the presentation error counter. The User Error Counter can be erased when the
submitted code is correct.
Command Format (abData field in the PC_to_RDR_XfrBlock)
Pseudo-APDU
CLA INS Error Counter LEN Byte Address MEM_L
CODE
Byte 1 Byte 2
FFh 20h 04h 08h 02h
Where:
Error Counter LEN Length of presentation error counter in bits
Byte Address Byte address of the key in the card
CODE 2 bytes User Code
Response Data Format (abData field in the RDR_to_PC_DataBlock)
SW1 SW2
Where:
SW1 SW2 = 90 00h if no error
= 63 00h if there are no more retries
Note: After SW1SW2 = 0x9000h has been received, read back the User Error Counter to check if
the VERIFY_USER_CODE is correct. If User Error Counter is erased and is equal to “0xFFh,” the
previous verification is successful.
9.3.8.6. VERIFY_MEMORY_CODE
This command is used to submit Memory Code (4 bytes) to the inserted card. Memory Code is used
to authorize the reloading of the user memory, together with the User Code.
The following actions are executed:
1. Present the specified code to the card.
2. Search a '1' bit in the presentation error counter and write the bit to '0'.
3. Erase the presentation error counter. Please note that Memory Error Counter cannot be
erased.