Packet 11: Pin Pad Connection Test; Packets 7 And 12: Dummy Packets - VeriFone MX800 series Programmer's Manual

IPP MS DUKPT C
AND OMMUNICATIONS
Common Packets
Packet 11: PIN Pad
Connection Test
Packet 11 Length:
Sample Packet
Packets 7 and 12:
Dummy Packets
296
M X 800 S P
ERIES ROGRAMMERS
P
ACKETS
Table 35 Packets 09 and 14 Communication Protocol (Continued)
Master Device
10 Clear IPP
<SI>0110<SO>{LRC}
ACK/NAK/EOT
The master device uses this packet to check the connection with the IPP. If the
connection is good, the master device receives an 'ACK' from the IPP within one
second. Else, it assumes that the IPP is not connected.
Table 36 Packet 11 Format
Data Element Characteristic
<SI> 1H
Packet Type 2AN
<SO> 1H
1H
{LRC}
•
MAX: 5 characters
•
MIN: 5 characters
<SI>11<SO>{LRC}
Table 37 Packet 11 Communication Protocol
Master Device
<SI>11<SO>{LRC}
Packets 7 and 12 are dummy packets. When the IPP receives these packets it
sends out only <ACK> within one second.
G
UIDE
Transmit
IPP
Direction
IPP7
ACK/NAK/EOT
<SI>14CLR COMPLETE<SO>{LRC}
EOT to terminate process.
Comments
Shift in, value: 0Fh
Value: 11
Shift out, value: 0Eh
Error check
Transmit
IPP
Direction
ACK if LRC
•
NAK if LRC incorrect
•
EOT after 3 NAKs
•