Stopping a Long Page Acquisition Sequence
MultiCam provides solutions for both fixed size and variable size objects.
When acquisition sequence is stopped, the "Surface Filled" signal will be reported as soon as all the acquired data lines are transferred to the host memory. The "MC_SIG_EAS" signal is also reported to the user.
Fixed size objects
When objects have fixed size, it is convenient to specify the number of lines to be acquired during a LongPage acquisition sequence with parameter SeqLength_Ln.
The acquisition sequence will automatically stop after the last acquired line. The last surface might be partially filled. All following conditions must be satisfied:
- SeqLength_Ln > 0
- SeqLength_Ln < (PageLength * 65 535)
- SeqLength_Ln < 231
This method does not require any specific signal or user actions.
Variable size objects
When objects have variable size, it is convenient to use the signal delivered by a position detector to generate an end trigger condition.
Parameter EndTrigLine specify the input pin. Polarity and electrical style are specified by parameters EndTrigEdge and EndTrigCtl.
In case a single signal is used to indicate the start and the stop object positions, the EndTrigLine input pin is the same as the TrigLine input pin with opposite polarities.
A programmable page delay can optionally be specified with parameter EndPageDelay_Ln. It compensates a trigger advance delivered by a position detector placed away from the camera field of view.