Missed Trigger Counters; Counter Reset By An External Signal - Photon Focus D/L-2048 User Manual

5 Functionality
By default the Encoder Position is only generated when TriggerMode=On and
TriggerSource=ABTrigger. When the property ABTriggerCountAlways=True, then the Encoder
Position is generated regardless of the trigger mode.

5.2.10 Missed Trigger Counters

The missed trigger counters are important tools to make sure that the frequency of an external
trigger can be processed by the camera. A value bigger than 0 indicates that not all applied
triggers were processed.
The missed trigger counters are reset by writing the value 0 to the counter register. The
counter value can be read out by a property or it can be embedded in the camera image by the
status line (see Section 5.8.2):
It is recommended to reset the missed trigger counters after modifying trigger-
related settings.
Missed Trigger Counter If an external trigger (TriggerMode=On) is applied while the camera is
not ready to accept a new trigger, a counter (Missed Trigger Counter) is incremented and
the trigger is rejected. The value of the Missed Trigger Counter can be read out from the
camera property (Counter_MissedTrigger). When the Missed Trigger Counter reaches its
maximal value it will not wrap around. The user can reset the Missed Trigger Counter by
writing the value 0 to Counter_MissedTrigger. In Burst Trigger Mode (see Section 5.2.7), an
increment of the missed burst trigger value indicates that the burst trigger period time
(Trigger_BurstTriggerPeriodTime) is too short for the applied camera settings.
Missed Burst Trigger Counter When the camera is in burst trigger mode (see Section 5.2.7), a
missed burst trigger counter will be incremented, when a subsequent external trigger
(TriggerMode=On) is applied while a burst sequence is running. The value of the Missed
Burst Trigger Counter can be read out from the camera property
(Counter_MissedBurstTrigger). When the Missed Burst Trigger Counter reaches its maximal
value it will not wrap around. The user can reset the Missed Burst Trigger Counter.

5.2.11 Counter Reset by an External Signal

The image counter and the real time counter (timestamp) (see Section 5.8.1) can be reset by an
external signal. Both counters can be embedded into the image by the status line (see Section
5.8) or their register can be read out. These counters may be used to check that no images are
lost or to ease the synchronisation of multiple cameras.
The external signal to reset the above mentionend counters is selected by the property
Counter_ResetCounterSource. Available choices are PLC_Q4 to PLC_Q7 (see Section 7.10), Line1
(ISO_IN1) and ExposureStart. ExposureStart resets the counters at the start of an exposure.
The property Counter_ResetCounterMode determines how often the selected source should reset
the counters. The setting Once works together with the property
Counter_ResetCounterOnNextTrigger.
If Counter_ResetCounterMode=Once, then the counters are reset on the next active edge of the
selected reset source (property Counter_ResetCounterSource) after the device is armed with
Counter_ResetCounterOnNextTrigger=True. The register Counter_ResetCounterOnNextTrigger is reset
after the resetting trigger is received.
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