Reference Manual Chapter 5
Ranger E/D
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Configuring Ranger E and D
5.5 Pulse Triggering Using an Encoder
5.5.1 Triggering Scans
The camera can be measuring in one of two different ways:
Pulse triggered The Ranger will make one measurement – or scan – after a specified
number of pulses have been received on the encoder inputs. This sig-
nal could for example be the differential signals Phase 1 and Phase 2
coming from an encoder on the conveyor belt.
This signal is connected to the differential inputs In1 and In2 on the
Encoder connector.
Free-running The Ranger will make measurements with a regular time interval.
In this mode, the distance between two scans may vary if the speed of
the object is not constant. To find the actual distance between two
scans, you can connect an encoder to the Ranger and embed encoder
data with the profiles.
In pulse triggered mode, the Ranger counts the number of pulses received on the encoder
inputs using an internal counter. When the specified number of pulses has been received,
a scan is triggered and the Ranger resets this counter.
To handle movements in both directions (forward and backward), the Ranger can be
configured to count the pulses in different ways, resulting in different ways to trigger
scans:
Mode Parameter
Position Trig mode = 3 The encoder trigs a scan for each object position.
If the object has moved backward no scans are made
until the object has moved (at least) an equal distance
forward.
Direction Trig mode = 4 The encoder trigs a scan when the object is moving
forward.
If the object has moved backward, new scans will be
made as soon as the object moves forward again.
Movement Trig mode = 5 The encoder trigs a scan when the object is moving
either backward or forward.
Pulse triggered
(legacy)
Trig mode = 2 Similar to the Position mode, but is more sensitive to
vibrations (jitter).
Figure 5.5 – Different pulse triggering modes.
Position
Moving backward
Moving forward
again
Direction
Movement
Moving forward
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