Principles of Operation
7
Vi
Vi
V
Vi
V
Vi
Note:
If you do not want to use an external line trigger, you can
specify the trigger type as Internal. The acquisition starts when you
execute an acquisition command, and the lines are acquired as
quickly as possible. If you specify an Internal trigger, the lines that
you acquire may not be contiguous and the timing between lines
may not be determinate.
Controlling the Acquisition of Lines and Frames
To control the acquisition of both individual lines and frames that are
built by acquiring multiple lines, you use an external line trigger (set
to ExternalForEach, as described in the previous section) to control
the acquisition of individual lines and an external frame trigger to
control the acquisition of frames.
The frame trigger input is provided through digital input line 0 (pin 1
of connector J2 on the DT3145 board). You can access this signal using
the STP15 screw terminal panel. The frame trigger must have a
minimum pulse width of 10
µ
s.
If you enable the frame trigger using software, the acquisition is
synchronized with a change-of-state on digital input line 0. Through
software, you can specify whether you want to acquire a frame when
a low-to-high (OnLowToHigh) transition occurs or when a
high-to-low (OnHighToLow) transition occurs.
Summary of Contents for DT3145
Page 1: ...DT3145 UM 19603 B User s Manual...
Page 4: ......
Page 32: ...Digital I O Signals 22...
Page 33: ...23 A Specifications...
Page 37: ...27 B Connector Pin Assignments J2 Connector 28 STP15 Connectors and Screw Terminals 30...
Page 42: ...Appendix B 32...
Page 43: ...33 C Values for Use with the DT Active Camera Link Frame Grabber Control...
Page 50: ...Appendix C 40...