LMI Gocator 2000 Family, Руководство пользователя

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Setup • 46 Gocator 2000 Family
Trigger
A trigger is an event that causes the Gocator to take a single picture. When a trigger is accepted, the
laser is strobed and the camera exposes to produce an image. The resulting image is processed inside
the sensor to yield a laser profile (range/distance information), which can then be used for measurement.
The laser and camera inside a Gocator sensor can be triggered by one of four sources:
Trigger Source Description
Time Sensors have an internal clock that can be used to generate fixed-frequency triggers.
Encoder An encoder can be connected to provide triggers in response to motion.
A scan is triggered only when the target object moves forward. If the target object
moves backward, it must move forward by at least the distance of one encoder spacing
to trigger a scan.
Refer to the Encoder Input section (page 178) for more information on connecting the
encoder to Gocator.
External Input A digital input can provide triggers in response to external events (e.g. photocell).
When triggers are received at a frequency higher than the maximum frame rate, some
triggers may not be accepted. The Trigger Drops Indicator in the Dashboard can be
used to check for this condition
Refer to Gocator I/O Connector (page 175) for more information on connecting
external input to Gocator.
Software A network command can be used to send a software trigger. Refer to the Ethernet
Protocol (page 109) in this guide for more information.
The trigger source is selected using the Trigger panel in the Setup page.
After specifying a trigger source, the Start Button can be used to start the sensor. When the sensor is
started, it will accept triggers and generate a laser profile each time that a trigger is received. The Stop