4M30 Camera User’s Manual
29
DALSA
03-32-10030-03
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 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.
