MultiCam Boards Documentation > DOMINO series Documentation > Analog Cameras Documentation > CamFile Templates for Domino > Selecting a Template > Asynchronous Reset Cameras

Asynchronous Reset Cameras

This section helps the MultiCam user to select the appropriate template for interfacing an analog progressive asynchronous reset camera to a Domino board.

The majority of cameras used for industrial applications are progressive-scan cameras operating in the asynchronous reset mode. The camera operates in the frame on-demand mode: it delivers an image frame on request when the application requires it.

On Domino frame grabbers, the frame grabber issue a "Reset" signal towards the camera to initiate the exposure phase of the image capture sequence. The "Reset" signal is sent by the frame grabber as a response to a "hardware trigger" originating from the system hardware or a "software trigger" originating from the application software running on the PC hosting the Domino board.

The duration of the exposure can be controlled by the frame grabber or by the camera.

When the exposure time of the camera can be controlled by the frame grabber using the pulse width of the "Reset" signal, it is recommended to select a "GrabberExposeAR" camera model. With that model, the exposure time is fully controlled by the Channel parameters of the Exposure Control category.

If the selection of the GrabberExposeAR is not possible, use instead the "CameraExposeAR" camera model. In that case, the exposure time needs to be defined by a camera setting. Furthermore, if a strobe output is also needed, it is necessary to copy the value of the exposure setting of the camera into the Channel parameter TrueExp_us in order to have the appropriate timing for the Strobe pulse produced by the Domino board.

For both Asynchronous reset camera models, there are five options for the synchronization scheme:

CamConfig

Hor. SyncMode (Signal)

Hor. SyncRef

Vert. SyncMode

Vert. SyncRef

PxxRA

Analog (Video)

Camera

Analog (Video)

Camera

PxxRA_D

Analog (Video)

Camera

Digital (Vsync)

Camera

PxxRD

Digital (Hsync, Pclk*)

Camera

Digital (Vsync)

Camera

PxxRM_A

Master(Hdrive)

Frame grabber

Analog (Video)

Camera

PxxRM_D

Master(Hdrive)

Frame grabber

Digital (Vsync)

Camera

The recommended synchronization scheme corresponds to the CamConfig value PxxRA_D. In that case, the frame grabber synchronizes horizontally using the sync signal embedded in the video; it synchronizes vertically using a digital vertical sync signal that is produced by the camera at the beginning of every valid. Such vertical sync signal is named Vsync in MultiCam and is often named "WEN" in the camera documentation manuals. The mode is applicable only if the following requirements are fulfilled by the camera:

If PxxRA_D is not possible because the Vsync pulse is not available or inadequate, consider PxxRA. In that case, the vertical synchronization uses a composite sync embedded in the analog video. The mode is applicable only if the following requirements are fulfilled by the camera:

For cameras requiring an Horizontal drive signal from the frame grabber, consider PxxRM_A and PxxRM_D. They have similar requirements than PxxRA and PxxRA_D for the vertical synchronization.

The PxxRD mode implements digital horizontal synchronization. It has the same requirements as PxxRA_D and PxxRM_D for the vertical synchronization. This mode requires the following digital synchronization signals, in addition to the Reset and analog video signals:

Domino Dł boards don't require the pixel clock.