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5 Functionality
There exist possibilities to transmit the combined frame even if there is not enough data to fill
it.
FrameCombine_Timeout A timeout can be specified after which the combined frame will be
transmitted, regardless if there was enough data to fill it. The timeout counter is reset
after each frame and counts until a new trigger has been detected or until the timeout is
reached. A value of 0 disables the timeout features (applies an indefinite timeout).
FrameCombine_ForceTimeout The transmission of the combined frame is forced by writing to
the FrameCombine_ForceTimeout property.
When FrameCombine is aborted, then the remaining data in the combined frame will be filled
with filler data: the first two pixels of every filler row have the values 0xBB (decimal 187) and
0x44 (decimal 68). The remaining pixels of the filler rows have the value 0.
FrameCombinePulse
The FrameCombinePulse feature generates a pulse on the PLC_A7 after the end of a combined
frame. This signal can be used in the control of peripherical equipment by connecting this
signal to a camera output (see Section 8.10.5).
Parameters to control the FrameCombinePulse feature:
FrameCombine_PulseWidth: Width of the generated pulse (
µ
s). A value of 0 turns off the
generation of pulses.
FrameCombine_PulseInvert: False: pulse is active high. True: pulse is active low.
The FrameCombinePulse feature can also be used when FrameCombine is turned
off. In this case a pulse is generated after the readout of every image.
5.2 Trigger and Strobe
5.2.1 Introduction
The start of the exposure of the camera’s image sensor is controlled by the trigger. The trigger
can either be generated internally by the camera (free running trigger mode) or by an external
device (external trigger mode).
This section refers to the external trigger mode if not otherwise specified.
In external trigger mode, the trigger can be applied through the CameraLink
®
interface
(interface trigger) or directly by the power supply connector of the camera (I/O Trigger) (see
Section 5.2.2). The trigger signal can be configured to be active high or active low. When the
frequency of the incoming triggers is higher than the maximal frame rate of the current
camera settings, then some trigger pulses will be missed. A missed trigger counter counts these
events. This counter can be read out by the user.
The exposure time in external trigger mode can be defined by the setting of the exposure time
register (camera controlled exposure mode) or by the width of the incoming trigger pulse
(trigger controlled exposure mode) (see Section 5.2.4).
An external trigger pulse starts the exposure of one image. In Burst Trigger Mode however, a
trigger pulse starts the exposure of a user defined number of images (see Section 5.2.7).
The start of the exposure is shortly after the active edge of the incoming trigger. An additional
trigger delay can be applied that delays the start of the exposure by a user defined time (see
Section 5.2.5). This often used to start the exposure after the trigger to a flash lighting source.
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