IPP MS AND DUKPT COMMUNICATIONS PACKETS
MS-Specific Packets
M
X
800 SERIES PROGRAMMERS GUIDE 319
Response Packet 04
Key-only Format
Length:
• MAX: 6 characters
• MIN: 6 characters
Response Packet 04
Key-only Format
Example:
<SI>040<SO>{LRC}
Packet 04 GISKE Key Block Format
The GISKE key block format communication protocol is used when the IPP is in
mixed or 3DES mode. The original GISKE (ASCII-hex) key usage attribute value
is saved in RAM (2 bytes).
<SI>042<SO>{LRC}
Table 59 Response Packet 04 Key-only Format Communication
Protocol
Master Device
Transmit
Direction
IPP
<SI>040<SO>{LRC}
• ACK if LRC okay
• NAK if LRC incorrect
• EOT after 3 NAKs
• PIN pad checks requested address [a].
<SI>04[r]<SO>{LRC}
• ACK if LRC okay
• NAK if LRC incorrect
• EOT after 3 NAKs
EOT
Table 60 Response Packet 04 GISKE Key Block Format
Data
Element
Characteristic Comments
<SI> 1H Shift In, Value: 0Fh
Packet Type 2AN Value: 04
[r] 1AN Response code:
• 0 = No master key at address [a]
• F = Master key present at address [a]
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