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Input signals
In order to use the external trigger port correctly and ensure external triggering operation for your camera, you
need to supply at least 4 input signals through the mini din receptacle. Pin 1 always needs to be powered at a 5V
potential, with Pins 4 and 6 always connected to ground. The input signal to begin triggering the camera is
through Pin 2 and should be a 5V TTL pulse.
Output signals
There are two output signals provided on the EXi Aqua camera, SYNC A and SYNC B.
SYNC A:
This signal indicates the readout time of the camera and this signal is active high. A user could
monitor this signal as a means of knowing when to trigger the next frame.
SYNC B:
This signal has two modes of operation which can be selected in software. Refer to the QCAM SDK
API documentation for further information on setting these parameters.
Expose mode:
If this modes is selected, the signal will indicate the exposure pulse of the camera. This
signal is active high and may be used to synchronize an external shuttering device.
Trigger mask:
If this mode is selected, the signal will indicate the time at which another trigger
signal will not be accepted by the camera. This signal is also active high.
Signal timing
Trigger
Expose
Integration Time
SYNC A
Readout Time
Figure 9 —
External trigger signal timing
•
The integration time corresponds to the length of time that the CCD has been programmed to be
exposed to the image.
•
The readout time corresponds to the time required to readout the CCD.
Summary of Contents for EXi Aqua
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