Data Translation DT3130 Series, Руководство пользователя

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Chapter 2
22
Figure 2: Strobe Polarity
Unconditional Strobe
To perform an unconditional strobe, use software to set up the board
to output a strobe signal regardless of the field or frame being
acquired (strobe now). Then, when you execute a software command,
the strobe signal is output.
Using software, you can specify the following parameters for an
unconditional strobe:
• The length of the strobe output pulse (3.3 ms, 6.6 ms, 13 ms,
26.6 ms, 53.3 ms, 106.6 ms, 213.3 ms, or 426.6 ms.
• The polarity of the strobe output signal as active high or active
low.
• The polarity of the strobe output signal as active high or active
low.
Low-to-
High Going
Pulse
Normally
Open
Circuit
High-to-Low
Going Pulse
Normally
Closed
Circuit
DT3131, DT3132, and DT3133
Boards
DT3131-ISO, DT3132-ISO,
and DT3133-ISO Boards
+
−
+
−
Active-High
Polarity
Active-Low
Polarity