MagTek HALF CARD PORT - Manual (Page 33)

Section 3. Commands, Formats, Timing
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Switch C
Switch C, Table 3-7, is used to define the way a card is read. The default for Switch C is:
00010101 Enable (but don’t require) tracks 1, 2 & 3; decode ISO/ABA tracks only
Table 3-7. Switch C
Command position 1 2 3 4 5 6 7 8
Byte Position 7 6 5 4 3 2 1 0 Description
0 0 Track 1 Disabled
0 1 Track 1 Enabled
1 1 Track 1 is required*
0 0 Track 2 Disabled
0 1 Track 2 Enabled
1 1 Track 2 is required*
0 0 Track 3 Disabled
0 1 Track 3 Enabled
1 1 Track 3 is required*
0 Decode ISO/ABA tracks only
1 Decode ISO/ABA & custom tracks
X Reserved
* If a track is required but does not exist, the Reader will indicate an error for that track.