Instruction manual
Guppy Technical ManualV7.4.0
159
Controlling image capture
One-shot command on the bus to start of
exposure
The following sections describe the time response of the camera using a single
frame (one-shot) command. As set out in the IIDC specification, this is a soft-
ware command that causes the camera to record and transmit a single frame.
The following values apply only when the camera is idle and ready for use. Full
resolution must also be set.
Microcontroller-Sync is an internal signal. It is generated by the microcontroller
to initiate a trigger. This can either be a direct trigger or a release for ExSync if
the camera is externally triggered.
End of exposure to first packet on the bus
After the exposure, the CCD or CMOS sensor is read out; some data is written into
a small FIFO buffer before being transmitted to the bus.
The time from the end of exposure to the start of transport on the bus is:
500 μs ± 62.5 μs
This time 'jitters' with the cycle time of the bus (125 μs).
# Read/Write Address Value Description
7 wr F0F0061C 80000000 Do one-shot.
6 rd F0F0061C 00000000 Read out one-shot register.
5 wr F0F00830 82000000 Switch on external trigger mode 0.
4 rd F0F00830 80000000 Check trigger status.
3 wr F0F00614 00000000 Stop free-run.
2 rd F0F00614 80000000 Check Iso_Enable mode (free-run).
1 rd F0F00614 00000000 This line is produced by SmartView.
Table 62: One-shot control: descriptions
Feature Value
One-shot Microcontroller-Sync 250 μs (processing time in the
microcontroller)
μC-Sync/ExSync Integration-Start 8 μs
Table 63: Values for one-shot