Instruction manual
Guppy Technical ManualV7.4.0
161
Controlling image capture
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. 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
162.
The following screenshot shows an example of broadcast commands sent with
the Firedemo example of FirePackage (version 1V51 or newer):
Figure 97: Broadcast one-shot