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5.2 Trigger and Strobe
5.2.2 Trigger Source
The trigger signal can be configured to be active high or active low by the
TriggerActivation
(category
AcquisitionControl
) property. One of the following trigger sources can be used:
Free running The trigger is generated internally by the camera. Exposure starts immediately
after the camera is ready and the maximal possible frame rate is attained, if
AcquisitionFrameRateEnable is disabled. Settings for free running trigger mode:
TriggerMode = Off. In Constant Frame Rate mode ( AcquisitionFrameRateEnable = True),
exposure starts after a user-specified time has elapsed from the previous exposure start so
that the resulting frame rate is equal to the value of
AcquisitionFrameRate .
Software Trigger The trigger signal is applied through a software command ( TriggerSoftware
in category AcquisitionControl ). Settings for Software Trigger mode: TriggerMode = On
and
TriggerSource
= Software.
Line1 Trigger
The trigger signal is applied directly to the camera by the power supply
connector through pin ISO_IN1 (see also Section A.1). A setup of this mode is shown in
Fig. 5.14 and Fig. 5.15. The electrical interface of the trigger input and the strobe output
is described in Section 7.7. Settings for Line1 Trigger mode:
TriggerMode
= On and
TriggerSource = Line1.
PLC_Q4 Trigger The trigger signal is applied by the Q4 output of the PLC (see also Section 7.8).
Settings for PLC_Q4 Trigger mode: TriggerMode = On and TriggerSource = PLC_Q4.
ABTrigger Trigger from incremental encoder (see Section 5.2.9). The A/B Trigger feature is not
available on all camera revisions, see Appendix B for a list of available features.
Some trigger signals are inverted. A schematic drawing is shown in Fig. 8.4.
5.2.3 Acquisition Mode
The available acquisition modes are shown in Table 5.3.
The
ContinuousRecording
and
ContinousReadout
modes can be used if more than
one camera is connected to the same network and need to shoot images si-
multaneously. If all cameras are set to Continuous mode, then all will send the
packets at same time resulting in network congestion. A better way would be to
set the cameras in
ContinuousRecording mode and save the images in the memory
of the IPEngine. The images can then be claimed with ContinousReadout from one
camera at a time avoid network collisions and congestion.
The memory for the ContinuousRecording is located in the IP engine and is aimed
for buffering some small amount of images at GigE speed in order to manage
the image transfer. For high speed recording, the image burst memory should
be used (see Section 5.11).
.
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