BackwardMotionCancellationMode
Operational mode of the Backward Motion Cancellation circuit
Applicable product(s): 1624 Grablink Base, 1623 Grablink DualBase, 1622 Grablink Full, 1626 Grablink Full XR.
Parameter Info
Class | Category | Level | Type | Access |
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Channel | Encoder Control | ADJUST | Enumerated | Set and Get |
Num ID | String Identifier | C, C++ identifier |
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10352 << 14 | BackwardMotionCancellationMode | MC_BackwardMotionCancellationMode |
Parameter Description
The backward cancellation circuit stops sending line trigger pulses as soon as a backward motion is detected. If such an event occurs, the acquisition is stopped.
When the backward cancellation control is configured in the FILTER mode (F-mode), the line acquisition resumes as soon as the motion is again in the forward direction. Therefore, the cancellation circuit filters out all the pulses corresponding to the backward direction.
When the backward cancellation control is configured in the COMPENSATE mode (C-mode), the line acquisition resumes when the motion is again in the forward direction at the place it was interrupted. Therefore, the cancellation circuit filters out not only the pulses corresponding to the backward direction, but a number of forward pulses equal to the number of skipped backward pulses.
In C-Mode, the cancellation circuit uses a "backward pulse counter" that:
- Increments by 1 every clock in the backward direction
- Decrements by 1 every clock in the forward direction until it reaches 0
- Resets at the beginning of each MultiCam acquisition sequence, more precisely, at the first trigger event of the sequence. This trigger is considered as the reference for the position along the web for the whole acquisition sequence.
In C-Mode, all pulses occurring when the counter value is different of zero are blocked.
The counter has a 16-bit span; backward displacement up to 65535 pulses can be compensated.
Parameter Usage
- Condition: The line trigger originates from a quadrature motion encoder.
- Condition: The rate converter circuit is unused.
Parameter Values
Enumeration: OFF, FILTERED, COMPENSATE
MC_BackwardMotionCancellationMode_OFF |
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Applicable product(s): 1624 Grablink Base, 1623 Grablink DualBase, 1622 Grablink Full, 1626 Grablink Full XR. Description The backward motion cancellation circuit is disabled.Default value. |
MC_BackwardMotionCancellationMode_FILTERED |
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Applicable product(s): 1624 Grablink Base, 1623 Grablink DualBase, 1622 Grablink Full, 1626 Grablink Full XR. Description The backward motion cancellation circuit is enabled and configured for the filter mode.
Applicability condition(s):
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MC_BackwardMotionCancellationMode_COMPENSATE |
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Applicable product(s): 1624 Grablink Base, 1623 Grablink DualBase, 1622 Grablink Full, 1626 Grablink Full XR. Description The backward motion cancellation circuit is enabled and configured for the compensation mode.
Applicability condition(s):
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