4M30 Camera User’s Manual
29
DALSA
03-32-10030-04
When the camera is in External Integration Mode, the MODE LED will be illuminated on the
camera back to indicate the camera is expecting a signal on the TRIGGER IN connector or Serial
Trigger bit [0] of the Control Register.
Because this signal is internally OR’ed with the Serial Trigger bit [0] of the Control Register, care
must be taken to ensure the bit [0] of the Control Register is not changed from logic 0 to 1 while
triggering with the TRIGGER IN connector.
External Integration/Serial Trigger
When in External Integration/Serial mode, a TTL rising edge on bit [0] of the Control Register
triggers the camera to acquire one frame of data. Due to variation in the host operating system, this
mode is generally used only for camera setup and functional testing. Integration begins within 175
ns after the rising edge and stops within 200 ns after the falling edge. After that single frame
acquisition, the camera outputs the just acquired frame and “re-arms”, thus waiting for a new
External Trigger signal to trigger a new frame acquisition. The camera is “armed” when the read
out of the acquired frame is completed
. No additional rising edges, or triggers, should be allowed
during the image acquisition or frame read out
. This means in this mode TRIGGER IN necessarily
controls both integration and frame rate.
When the camera is in External Integration Mode, the MODE LED will be illuminated on the
camera back to indicate the camera is expecting a signal on serial bit [0] of the Control Register, or
the TRIGGER IN connector.
Because this signal is internally OR’ed with the TRIGGER IN input, care must be taken to ensure
the TRIGGER IN signal is not changed from logic 0 to 1 while triggering with bit [0] of the
Control Register.
3.15 Controlling Frame Rate
The 4M30 allows you to control frame rate in three ways:
•
Free Running (Programmed Integration time):
The camera free runs with the internally
programmed integration time which can be used to set frame rate.
•
External Trigger/Internal Integration:
The camera frame rate will be controlled by the TTL
pulse on the TRIGGER IN SMA connector or serial bit [0] of the Control Register. The
camera will integrate for the programmed integration time. For more information, refer to
section 3.14 Controlling Integration Mode.
•
External Integration:
The camera frame rate will be controlled by the TTL pulse on the
TRIGGER IN SMA connector or serial bit [0] of the Control Register. The camera will
integrate for as long as the pulse is held high. In this mode, TRIGGER IN also controls
integration. For more information, refer to
section 3.14 Controlling Integration Mode.
Free Running
Frame Rate can only be controlled by setting integration time.
To specify programmed frame rate (by using integration time):
1.
Set bit [7] of the Control Register to 0 (Integrate Mode = Internal), and bit [3] of the Control
Register to 0 (Trigger Mode = Internal). To determine the integration time needed for a
specific frame rate use the following equation:
Integration Time = (1/Frame rate) - 32.35ms
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