8
Trigger Modes
The PLCS-21 supports a number of trigger modes which are described below. The width
and repetition rate of the pulses generated are user defined. Pulses will always be
generated as long as the trigger condition matches and the laser is enabled.
As an input for the trigger signal the connector 4 or 5 can be used. Figure 3
shows the
schematic of both inputs. Note that they are galvanically isolated from the supply voltage.
For trigger levels see the electrical characteristics on section “Electrical Characteristics”.
Important: Never use both trigger inputs at the same time. Correct operation is not
ensured if both inputs are connected to a source. Furthermore, a signal fed into one
input may result in a current flowing out of the other input. This might damage
your trigger source.
In the following the different trigger modes are described separately. For more details on
the trigger modes please also refer to the table in the section “Description of the LSTAT
Register” on page 25.
Edge
In this mode an external trigger source is required to generate pulses. The pulses can either
be generated on the rising (mode 1) or the falling edge (mode 0) of the supplied trigger.
On each edge which equates the given setting, a given number of pulses (“Shots”) will be
generated.
Pulse
In this mode an external trigger source is required to generate pulses. The PLCS will
generate pulses during the positive (mode 5) or negative part (mode 4) of the trigger
source.
Internal
In this mode the external trigger source is ignored. The PLCS will generate an infinite
number of pulses by itself and is selected by either trigger mode 2 or 3.
U
T,500
R
T,500
Connector 4
U
T,50
R
T,50
Connector 5
Figure 3: Trigger input circuit
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