Tabor Electronics 5251, Руководство пользователя

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4
Remote Programming Reference
Sequenced Waveforms Control Commands
4-37
SEQuence:ADVance{AUTOmatic|STEP|SINGle|MIXed}(?)
Description
This command will select the sequence advance mode. The way the instrument advances through the
sequence links can be specified by the user.
Parameters
Name Type Default Description
AUTOmatic Discrete AUTO Specifies continuous advance where the generator
steps continuously to the end of the sequence table
and repeats the sequence from the start. For
example, if a sequence is made of three segments 1,
2 and 3, the sequence will generate an infinite
number of 1,2,3,1,2,3,1,2,3…waveforms. Of course,
each link (segment) can be programmed with its
associated loop (repeat) number.
STEP Discrete In step advance mode, the sequence is advanced to
the next waveform only when a valid trigger is
received. The output of the 5251 generates the first
segment continuously until a trigger signal advances
the sequence to the next segment. If repeats were
selected for a segment, the loop counter is executed
automatically.
SINGle Discrete In single advance mode, the generator idles between
steps until a valid trigger signal is sensed. This mode
operates with trigger mode only. An attempt to select
the SING advance mode when the 5251 is in
continuous operating mode will generate an error.
After trigger, the generator outputs one waveform
cycle. Then, the output level idles at a DC level equal
to the last point of the last generated waveform. If
loops (repeats) were programmed, the output will
repeat this segment every time a trigger is received.
Only after executing all of the programmed loops will
the sequence step to the next assigned segment.
MIXed Discrete Mixed mode is a special mode that combines
continuous step advance with single step advance in
a sequence. There are three conditions for the
sequence generator to operate in this mode:
1) The 5251 must be set to operate in continuous
mode
2) Select the MIX sequence advance mode
3) Assign the mixed mode bits for each sequence
step in your SEQ:DEF command. “0” programs
normal advance, “1” programs trigger advance.
Step with a “0” bit assigned to it will advance
automatically to the next step. If “1” is assigned to
a step, the instrument will generate this step and
its associated number of repeats continuously