The following table describes the line scan settings available for the In-Sight 3800 Line Scan vision system models:

Setting | Description
--- | ---
Line Trigger Type | Defines the type of encoder. The following options are available: Software Encoder: The software encoder emulates a hardware encoder and acquires lines at a rate defined by the Line Period parameter. Hardware Encoder: An external hardware encoder drives the line triggers at the resolution defined by the Steps Per Line parameter.
Line Period | Defines the time for each image line in microseconds. The available values are 0–1000000. Line Period Setting Recommendations Cognex recommends the following line period settings to avoid line overrun, depending on the resolution mode:
Resolution Mode | Line Period
1K | 0.5 μs greater than exposure or 11.4 μs, whichever is greater.
2K | 0.5 μs greater than exposure or 5.9 μs, whichever is greater.
4K | 0.5 μs greater than exposure or 11.9 μs, whichever is greater.
Note: If you select a value that exceeds the maximum line period for a given exposure, the line period is automatically set to the fastest possible value. Note: Only available when Line Trigger Type is set to Software Encoder.
Steps Per Line | Defines the number of encoder steps for each image line. A step is a complete cycle of the encoder signal or signals, depending on the encoder you use. For a single-line hardware encoder, a complete cycle is equivalent to two signal transitions. For a quadrature hardware encoder, a complete cycle is equivalent to four signal transitions. The following image shows how steps per line correlate to signal transition for different encoders: The available values are 0.25–4000000. Note: Increment by 0.5 for single-line hardware encoders, and by 0.25 for quadrature hardware encoders. Note: The Steps Per Line parameter is only available when the Line Trigger Type is set to Hardware Encoder.
Encoder Type | Defines the type of hardware encoder used to trigger line acquisitions. The following options are available: Single (default): when using a single-line encoder, you must wire it to the first encoder input. Connecting the line to the second input has no effect. Quadrature: Quadrature encoders provide direction information and require two high-speed inputs.
Direction | Defines the forward direction of the quadrature encoder. The vision system uses the Direction to determine the correct operating direction. The following options are available: Positive (default): Positive direction indicates a part moving from right to left, from the perspective of the vision system. Negative Reversing the direction during image acquisition Acquisition is the process or result of the vision system acquiring a new image. stops the acquisition. You can continue the acquisition when the vision system reaches the saturation boundary by advancing forward back to the original position. Note: Only available when Encoder Type is set to Quadrature.
- Clip Mode | Specifies an action if an image acquisition trigger is received, but the specified number of lines have not yet been acquired. The following options are available: No Clipping (default) Specifies that the image trigger is ignored and an "Acquisition error" event generated.
  Image Trigger |
  Number | Description
  1 | Trigger
  2 | Missed Acquisition
  3 | Trigger
  4 | Missed Acquisition
  5 | Image 1, 2048 Lines
  6 | Image 2, 2048 Lines
  Acquired Images
  1024
  2048
  Image 1 | Image 2 |
- Overlap Specifies that the system services the incoming trigger before completing the specified number of lines in the current image. Every line acquired after the incoming trigger repeats at the beginning of the next image.
  Image Trigger |
  Number | Description
  1 | Trigger Image 1
  2 | Trigger Image 2
  3 | End of Image 1
  4 | End of Image 2
  5 | Image 1
  6 | Overlap
  7 | Image 2
  | Acquired Images
  750 Lines |  | 750
  | 3346
  750 Lines | 4096
  | Image 1 | Image 2 |
- Fill Black Specifies that the remaining lines are filled with black pixels, and a new image is immediately started. An "Acquisition error" event is not generated.
  Image Trigger |
  Number | Description
  1 | Trigger
  2 | Clip
  3 | Clip
  4 | Clip
  5 | Image 1, 1134 Lines
  6 | Image 2, 1658 Lines
  7 | Image 3, 960 Lines
  8 | Image 4
  Note: To avoid missing triggers with the overlap option, limit the overlap to about 50% of the total image size. The Fill Black option requires roughly: 9.5 µsec per line of fill in 4k mode 5.0 µsec per line of fill in 2k mode 3.2 µsec per line of fill in 1k mode |
  Acquired Images
  1024
  2048
  Image 1 | Image 2 | Image 3 |
- Reduce Image Specifies that the current image is reduced to the size of the number of rows currently acquired, and a new image is immediately started. Note: You can only use the Reduce Image clip mode if you have a hardware encoder configured. Reduce Image clip mode can only be used with End of Trigger mode.
  Image Trigger |
  Number | Description
  1 | Trigger
  2 | Clip
  3 | Clip
  4 | Clip
  5 | Image 1, 1134 Lines
  6 | Image 2, 1658 Lines
  7 | Image 3, 960 Lines
  8 | Image 4
  Acquired Images
  1024
  2048
  Image 1 | Image 2 | Image 3 |
Acquisition Duration | Specifies when to end image acquisition if the Clip Mode is set to Fill Black or Reduce Image. The following options are available: Next Trigger (default): Image acquisition begins at the leading edge of the trigger pulse and ends at the beginning of the next trigger signal. End of Trigger: Image acquisition begins at the leading edge of the trigger pulse and ends at the trailing edge of the trigger pulse. Image acquisition is complete when one of the following occurs: The specified Number of Lines have been acquired, even if the trailing edge of the trigger pulse has not yet arrived. The trailing edge of the pulse arrives and terminates acquisition before the specified Number of Lines have been acquired. Note: The End of Trigger mode can only be used with the Reduce Image clip mode.
Encoder Trigger Delay | Specifies a delay to the trigger in encoder steps. Up to 18 triggers can be queued within the delay.
Encoder Acquisition Timeout | Defines the maximum amount of time to acquire an image in milliseconds. If the vision system does not complete image acquisition within the specified time, the vision system aborts the acquisition and an issues Acquisition Error. The available values are 0–10000. The default value 0 means that the timeout is disabled.