VeriFone MX800 Series - Page 307

IPP MS AND DUKPT COMMUNICATIONS PACKETS
Common Packets
M
X
800 SERIES PROGRAMMERS GUIDE 307
Packet 18 Length: • MAX: 8 characters
• MIN: 8 characters
DUKPT Engine 1/2
Mode Flag [DEMF]
Note: This field was
added for IPP8
emulation.
1AH The one ASCII-Hex digit is used
produce half of a control byte.
Example:
<SO> 1H Shift Out, value: 0Eh
{LRC} 1H Error Check
Table 45 Packet 18 Format
Data Elements Characteristics Comments
Bit 0 ( DUKPT Engine "1")
Description
0 1DES DUKPT - Default
1 3DES DUPKT
Bit 1 ( DUKPT Engine "2")
Description
0 1DES DUKPT - Default
1 3DES DUPKT
Bit 2 ~ 3
----------
Reserved
Engine= 1 2
DEMF = 0x30 0 1DES 1DES
0x31 1 3DES 1DES
0x32 2 1DES 3DES
0x33 3 3DES 3DES
Table 46 Packet 18 Check IPP7 Key Management Mode
Master Device
Transmit
Direction
IPP
<SI>18<SO>{LRC}
• ACK if LRC
• NAK if LRC incorrect
• EOT after 3 NAKs
<SI>18[KMM][PINER]<SO>{LRC}