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User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 82 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Example—"Generator Level Trigger" Mode
With the "Generator Level Trigger" mode, the trigger output will be synchronized with the wave
generator output, and CTO must be used in combination with TWS.
The length of a single trigger pulse is the same as the duration of one servo cycle. If the signal level
is set to HIGH with TWS for consecutive points of a wave table, the signal level therefore does
not
change back to LOW between the points.
The following parameter must be set for the digital output line which is to be used for trigger
output (<TrigOutID>):
TriggerMode (<CTOPam> = 3)
General notation of the CTO command for this mode:
Command mnemonic Trigger mode selection
CTO
<TrigOutID> 3 4
Instead of using the CTO command, you can also set the value of the corresponding parameter
with SPA or SEP, see “Configuring Trigger Output” (p. 69) for a parameter list.
Example 1: Generate single trigger pulses synchronized with the wave generator in Generator Level
Trigger mode.
Command String to Send
Action Performed
WAV 2 X SIN_P 2000 20 10 2000 0 1000
Define a sine waveform for Wave Table 2, the segment
length and hence the number of points in the wave table is
2000
TWC
Clears all output trigger settings related to the wave
generator by switching the signal state for all points to "low"
(the power-on default state is also "low"). It is recommended
to use TWC before new trigger actions are defined.
TWS 1 500 1 1 1500 1 1 1900 1 1 2000 1
Set trigger actions for the digital output line OUT1 (identifier
is 1): at the waveform points 500, 1500, 1900 and 2000 it is
set high; at all other points the state of the line is low (due to
the TWC usage).
CTO 1 3 4
The digital output line OUT1 is set to "Generator Level
Trigger" mode.
WSL 1 2
Connect Wave Generator 1 (Axis 1) to Wave Table 2
WGO 1 1
Start output of Wave Generator 1 immediately (synchronized
by servo cycle). Now the trigger output action will take place
as specified.
WGO 1 0
Stop output of Wave Generator 1 and hence also the trigger
output.