User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06
Section 10 – Online transaction messages with DUKPT 2015-04-20
Page245
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message 71 Encrypted PIN Block Response
Format: <STX>71<fkey flag>[Key Serial#][PIN][LRC] (PIN block frame)
<STX>71[error code]<ETX>[LRC] (Error code frame)
Message length: Variable 32 to 42 bytes.
Usage: Send the entered PIN to HOST in encrypted format.
Message element:
Field Length Value and description
<STX> 1 <02>
71 2 Message ID
[fkey flag] 1 Always ‘0’ (This field is kept to retain old
model compatibility.)
[Key Serial#] 10..20 Key Serial number used in encrypting PIN.
Included only when PIN is entered.
Format: hexadecimal string.
[PIN] 16 Encrypted PIN block
Format: hexadecimal string.
<ETX> 1 <03>
[LRC] 1 Checksum
Message flow:
Please refer to message70 (DUKPT).
Error codes:
Code Meaning
‘0’ Null Account input field.
‘2’ Account number shorter than 8 digits.
‘3’ Account number longer than 19 digits.
‘4’ Account number have character other than ‘0’-‘9’.
‘5’ [D/C ind] field not exist or format error.
‘6’ Timeout value error.
'8' Amount string format error.
‘A’ No DUKPT key injected
‘B’ Flash read/write error
‘C’ Memory buffer allocation error
‘F’ DUKPT operation limit (1 million) reached, program stop.
‘G’ Specified file not found or authentication error.