Manual

Controlling image capture
GUPPY Technical Manual V7.1.0
187
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 acknowl-
edge.
This makes it possible for all cameras on a bus to be triggered by software
simultaneously - 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 cameras in the range of 125 µs.
Inter-camera latency is described in Chapter Jitter at start of exposure on
page 188.
The following screenshot shows an example of broadcast commands sent with
the Firedemo example of FirePackage (version 1V51 or newer):
Figure 105: Broadcast one-shot