VeriFone MX800 series Programmer's Manual page 337

Table 87
Data Element
Second Key
<FS>
Message for
MAC
<ETX>
{LRC}
a. ASCII messages for MAC should not include ETX(0x03) or SO(0x0E).
•
MAC Packet Z66
Length:
•
MAC Packet Z66
<STX>Z663002<FS>0123456789123456<FS><FS>0123456789ABCDEF<ETX>{LRC}
Example:
1
Notes
2
3
4
5
MAC Packet Z66 Format (Continued)
Characteristic
1N
1H
8*XAN0
a
1H
1H
MAX: 255 characters
MIN: 12 characters
Maximum of 100 Z66 packets can be sent during one MAC session.
8*XAN in "Message for MAC" represents the number of 8-byte (or character)
blocks. For example,
•
X = 0: no message data
•
X = 1: 8 bytes of message data
•
X = 2: 16 bytes of message data
•
X = 3: 24 bytes of message data
:
:
•
X = 27: 216 bytes of message data
•
X = 28: 224 bytes of message data
For ASCII data, all values of X from 0–28 are allowed.
For Binary data, only 0, 2, 4, 6,...., 26, 28 are permitted. (X = 2 * N, where N =
0 to 14.)
If the length of "Message for MAC" is not a multiple of 8 in the final Z66 packet,
the PIN pad automatically pads it with zeros (ASCII 30h) internally.
An example of a 8-byte data block for the ASCII message "AMT$1.99" is
"414D5424312E3939"
ASCII-coded binary message is two hex digits that represent a byte value, see
the conversion result above.
IPP MS DUKPT C
AND
Comments
Optional; Second master key pointer;
Range: 0–9
Field separator, value: 1Ch
ASCII message or ASCII-coded binary data:
X= 0–28 for ASCII data
X= 0,2,4,6,...,27,28 for binary data
End of text, value: 03h
Error check
X
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MAC-Specific Packets
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