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
Page256
Uniform Industrial Corp. Proprietary and Confidential Total 342 pages
Message 91 Load Initial Key Response
Format: <STX>91[Status]<ETX>[LRC]
Message length: Variable (max 7 bytes.)
Usage: Confirmation of the initial key loading. PP791 will also show a message “IPEK n
loaded” (n = 1 or 2) to confirm the success loading of initial key of set 1 and set 2
visually.
Message element:
Field Length Value and description
<STX> 1 <02>
91 2 Message ID
[Status] 1..2 ‘0’ if successful
‘1’ + [Error Code] if process failed.
<ETX> 1 <03>
[LRC] 1 Checksum
Message flow: Please reference message90.
Error codes:
Code Meaning
'1'
Processing message 90 without authentication, process
authentication at first
'2' IPEK and KSN format error: not hexadecimal character.
'3' Internal memory allocation error.
'4' Internal fail to read key structure
‘A’ TR31 format error.
‘B’
Insecure key inject. (New key is longer than the key used to
protect it.)
‘C’ Fail to verify MAC value.
‘D’ KLK does not exist.
‘F’ Key loading count over limit.