VeriFone MX800 series Programmer's Manual page 325

Table 66
Data Element
<SI>
Packet Type
[a]
<SO>
{LRC}
DUKPT Packet 19 Length:
Maximum: 6 characters
Minimum: 6 characters
Sample Packet: To select second DUKPT Engine:
<SI>192<SO>{LRC}
Table 67
Master Device
<SI>19[a]<SO>{LRC}
ACK if LRC okay
•
NAK if LRC incorrect
•
(EOT after 3 NAKs)
•
NOTE
•
DUKPT Packet 19 Format
Characteristic
1H
2AN
1N
1H
1H
DUKPT Packet 19 Communication Protocol
Transmit
Direction
If there is any packet format error, IPP does not echo the response packet back to the
master device. The incorrect packet format includes out of range DUKPT engine,
incorrect packet type, incorrect packet length, etc.
The default DUKPT engine is set to "0".
IPP MS DUKPT C
AND
Comments
Shift In, Value: 0Fh
Value: 19
DUKPT Engine: "0", "1",or "2"
Shift Out, Value: 0Eh
Error Check
IPP
ACK if LRC okay
•
NAK if LRC incorrect (EOT after 3 NAKs).
•
Echo packet 19 setting
<SI>19[a]<SO>{LRC}
...
IPP changes DUKPT engine
...
EOT to terminate process.
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M 800 S
ERIES
P
OMMUNICATIONS ACKETS
DUKPT-Specific Packets
325
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