Instruction manual

Guppy PRO Technical ManualV4.1.0
137
Controlling image capture
Multi-shot
Setting multi-shot and entering a quantity of images in Count_Number in the
61Ch register enables the camera to record a specified number of images.
The number is indicated in bits 16 to 31. If the camera is put into ISO_Enable
mode (see chapter ISO_Enable / free-run on page 137), this flag is ignored and
deleted automatically once all the images have been recorded.
If multi-shot mode is activated and the images have not yet all been captured,
it can be cancelled by resetting the flag. The same result can be achieved by set-
ting the number of images to 0.
Multi-shot can also be combined with the external trigger in order to grab a cer-
tain number of images based on an external trigger.
ISO_Enable / free-run
Setting the MSB (bit 0) in the 614h register (ISO_ENA) puts the camera into
ISO_Enable mode or Continuous_Shot (free-run). The camera captures an
infinite series of images. This operation can be quit by deleting the 0 bit.
Asynchronous broadcast
The camera accepts asynchronous broadcasts. This involves asynchronous write
requests that use node number 63 as the target node with no acknowledge.
This makes it possible for all cameras on a bus to be triggered by software simul-
taneously - e.g. by broadcasting a one-shot. All cameras receive the one-shot
command in the same IEEE 1394 bus cycle. This creates uncertainty for all cam-
eras in the range of 125 μs.
Inter-camera latency is described in chapter Jitter at start of exposure on page
138.
The following screenshot shows an example of broadcast commands sent with
the Firedemo example of FirePackage:
Figure 72: Broadcast one-shot