TRIGGERED
RECORDING
OPTICAL
Suppose you want to record part of an assembly line when a
machine jams. The machine has a fault light that comes on
whenever the machine jams.
Use a photo-transistor detection circuit to "see" when the fault
light comes on. Take the output of the photo-transistor detection
circuit and condition it to be used as a trigger signal for the
TRIGGER IN connector.
You will have to select the RECORD TRIGGER mode and set the
TRIG number so that the Processor records the part of the ma-
chine you wish to record when the jam occurs.
SWITCH CLOSURE
Suppose a machine uses relays to activate certain functions. If
the relay that controls the function you wish to record has an
unused contact, you could connect that contact to the TRIGGER
IN connector and use the relay contact as the triggering signal.
VOLTAGE
Suppose you want to record a package as it passes in front of the
Imager.
You could design an interface to detect the presence of the
package and connect it to the TRIGGER IN connector. The
interface would have to be a sensor that would detect the
presence of the package and translate the sensor voltage into a
TTL signal.
Each time the sensor detects a package the Processor would see
the package and record its passage with the number of frames
before and after the trigger time that you set up.
6.11
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