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5 Functionality
There is a bug in the single A/B trigger mode in some camera revisions (see Ap-
pendix B). In this case when the encoder position moves back and forth by a
small amount, the EncoderCounter is incremented and the decrement is some-
times omitted, leading to a wrong EncoderPosition indication in the camera.
Therefore the single A/B trigger mode should not be used in the affected ver-
sions. To have the same behaviour as the single trigger mode, but without the
bug, use the double A/B mode and double the value of
ABTriggerDivider
.
A
B
G r a y C o u n t e r
E n c o d e r C o u n t e r
T r i g g e r F w d
T r i g g e r B k w d
0 1 2 3 0 1 2 3 2 1 0 3 2 1 2 3 0
0 1 2 1 0
T r i g g e r F w d B k w d
1
1
Figure 5.19: Single A/B Mode
A
B
G r a y C o u n t e r
E n c o d e r C o u n t e r
T r i g g e r F w d
T r i g g e r B k w d
0 1 2 3 0 1 2 3 2 1 0 3 2 1 2 3 0
0 1 2 3 4 3 2 1 2
T r i g g e r B k w d
1
3
Figure 5.20: Double A/B Mode
A
B
G r a y C o u n t e r
E n c o d e r C o u n t e r
T r i g g e r F w d
T r i g g e r B k w d
0 1 2 3 0 1 2 3 2 1 0 3 2 1 2 3 0
0 1 2 3 4 5 6 7 6 5 4 3 2 1 2 3 4
T r i g g e r F w d B k w d
1
5
Figure 5.21: Quad A/B Mode
.
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