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Absolute Control Value For The Shutter; Auto Exposure; Trigger Shutter - Sony XCD-SX910CR/X710CR Technical Manual

Digital video camera module.
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For long exposure times
When exposure times longer than the currently set
frame rate cycle are set, the camera enters the long
exposure time mode, and the actual frame rate is
slowed in accordance with the exposure time.
Absolute Control Value for the
Shutter
Control of exposure time using absolute values is
possible. The values are indicated using a 32-bit
floating point value. (Unit: sec.)
The control steps are synchronized with the pixel
clock, and as the pixel clock is 30.5 MHz, one step is
approximately 32.8 ns.
The range for these values extends from 10
microseconds to 17.5 seconds.
Programming example;
union {
DWORD
dwValue;
float
fValue;
} AbsoluteShutterValue;
AbsoluteShutterValue.fValue = Exposure time;
WriteQuad(AbsoluteShutterOffsetAddress,
AbsoluteShutterValue.dwValue);
WriteQuad is a virtual function used to write in the
register.
AbsoluteShutterOffsetAddress is an offset address for
the absolute value control. See page 25 for the formula
for the offset address.

Auto Exposure

AutoExposure is a function that automatically adjusts
the gain and shutter settings, based on the brightness of
the subject. When this function is used, make sure the
video mode is set to one of the following modes. This
function is not effective in any other modes.
XCD-SX910CR/SX910 Format2Mode2 (1280 × 960)
Format1Mode5 (1024 × 768)
XCD-X710CR/X710
XCD-SX910CR/X710CR
XCD-SX910/X710
// 1394 is expressed in quadlets,
// exposure time is indicated in seconds.
15 fps TriggerOFF
30 fps TriggerOFF

Trigger Shutter

Trigger shutter is useful for capturing images in
response to a trigger 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. When a
trigger shutter is used, the required trigger is input via
the BNC connector on the rear panel. The input signal
is a 5-volt negative pulse. The falling edge of the
signal is detected as the trigger, and the unit is
equipped with an exposure time consisting of the
shutter parameter set as trigger mode 0, and trigger
mode 1 that controls the exposure timing using the
width of the trigger signal pulse. The minimum width
of the trigger is 10 microseconds. When trigger mode 1
is used, there is no limit to the exposure time.
This unit can also be used with a software trigger that
issues the trigger signal via a software command. Both
trigger mode 0 and trigger mode 1 can be used with
software triggers.
Trigger shutter
10 µsec or more
• Input impedance: 10 kΩ
Functions
4.0 – 5.0 Vp-p
9

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