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10
Functions
Shutter
This camera allows users to set manual shutter speeds.
The variable range extends from 20 microseconds to 1
seconds; relative values are indicated by a 12-bit integer,
and absolute values are indicated using a 32-bit floating
point value.
When setting an exposure time longer than the cycle of
the set frame rate, it sets to long exposure time mode and
the actual frame rate is reduced in accordance with the
exposure time.
The relationship between the parameter and the
exposure time is given by the following formulas,
where:
P = Parameter (004h to 3E8h)
E = Exposure time (s)
If P= 4
E = 0.00002
If 5 <= P <= 1000
Setting examples
4 (003h) : 20 µs (1/50000)
32 (020h) : 1 ms (1/1000)
100 (064h) : 10 ms (1/100)
1000 (3E8h) : 1 s
128 (080h) : 16.384 ms (1/60: default setting)
Note
This camera outputs images for 4 frames from the frame
changed by the shutter. Images effective from the fifth
frame are output. Be sure to take note of this before use.
Trigger
Trigger shutter is useful for capturing images in
response to a trigger signal that starts the exposure to
match a preset timing. It can also be used to capture an
image using multiple cameras with the same timing.
This camera supports a hardware trigger input from
8-pin connectors, and 2 types of software trigger set by
1394 bus command.
Note
Switching trigger signals may cause image disturbance.
Be sure to take note of this before use.
Trigger Polarity
This feature selects the active polarity of the hardware
trigger. There are positive and negative polarities so,
first, fix the trigger polarity and then use the other trigger
function.
Active polarity: Negative polarity (default setting)
Trigger Delay
This feature adds an internal delay to the trigger. It is
used to align the timing by adjusting the delay when the
trigger timing and object position are out of alignment,
or when fine-tuning the trigger signal timing in multiple
machines.
Note
Use the trigger delay when the input trigger cycle is long
enough for the trigger delay. The image will not be
output properly if the trigger delay value is longer than
the input trigger cycle.
E
1 s
20 µs
4
1000
P
Trigger
(positive polarity)
Exposure
Post delay trigger
