Instruction manual

Controlling image capture
PIKE Technical Manual V3.1.0
157
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 uncer-
tainty for all cameras in the range of 125 µs.
Inter-camera latency is described in Chapter Jitter at start of exposure on
page 158.
The following screenshot shows an example of broadcast commands sent with
the Firedemo example of FirePackage:
• Line 1 shows the broadcast command, which stops all cameras con-
nected to the same IEEE 1394 bus. It is generated by holding the
<shift> key down while clicking on <Write>.
•Line 2 generates a broadcast One_Shot in the same way, which forces
all connected cameras to simultaneously grab one image.
Figure 81: Broadcast one-shot