User's Manual
PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Appendix B – PIN Block Format 2015-04-20
Page327
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Appendix B PIN Block Format
ANSI x9.8 format (MK/SK, DUKPT, and Offline clear text PIN entry)
PP791 outputs ANSI X9.8 PIN blocks. Its format as follows:
PIN Block Format
Bit
0-3
4-7
8-11
12-15
16-19
20-23
24-27
28-31
32-35
36-39
40-43
44-47
48-51
52-55
56-59
60-63
Value
C N P P P P P/F
P/F
P/F
P/F
P/F
P/F
P/F
P/F
F F
Bit field explanation:
C - Control field (Format number). Value = 0000 (Does not support Format 1 or Format 3)
N - PIN length entered field. Value = 0100 to 1100 (4-12) (0x4 – 0xC)
P - PIN digit. Value = 0000 to 1001 (0-9)
F - Fill digit. Value = 1111 (F)
P/F - Pin digit or fill digit, as determined by PIN Length N. PIN Length is 4 to 12
Primary Account Number Block (PANB) Format
Bit
0-3
4-7
8-11
12-15
16-19
20-23
24-27
28-31
32-35
36-39
40-43
44-47
48-51
52-55
56-59
60-63
Value
0 0 0 0 A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
Bit field explanation:
A - The twelve rightmost digits of the primary account number (PAN), excluding the check digit. A1 is the
most significant digit and A12 is the digit immediately preceding the PAN’s check digit. If the primary account
number excluding the check digit is less than twelve digits, the digits are right justified and padded on the left
with zeroes. Permissible values are 0000 to 1001.
0 - Pad digit = 0000. The first four digits of the account number block are always padded with this value.
Formatted Clear-Text PIN Block
The PIN and account number blocks are Exclusive ORed before being assembled in the DES (Data
Encryption Standard) input register. When the account number is not available, only the PIN block is
assembled in the DES input register. PP791 will output DES/TDES encrypted PIN block with message 71
and delete clear-text PIN block immediately after transaction completed.
Example:
Account Number: 1234567890-6 (6 is check number and will be ignored)
PIN: 8780
The PIN block = 04 87 80 FF FF FF FF FF
The PANB = 00 00 12 34 56 78 90 00
Formatted PIN block = 04 87 92 CB A9 87 6F FF (Data to be encrypted)