270M
Rapid Scanning Imaging Spectrograph
scanning speed is controlled by MONOFREQ. Slit speed is controlled by SLITFREQ.
Shutter control pulse width is set by SHUTTERFREQ. Turret and mirror control pulse
width is set by DCFREQ.
EXAMPLES:
"F
3000 400 400 400;
11
- set frequency for monochromator
to
3000, frequency for slit,
shutter, and de each
to
400 (these are the default frequencies}.
"Foo
o
soo;•
-set frequency for de
to
600, others stay as they are.
NOTE:
This is the only function that can be called before initializing the system (see
2,
below}.
2.2 Initializing
the
System:
Before spectrometer devices can be accurately positioned, they must be set to known
positions. The driver must be told what these known positions are and several
variables within the driver must be set. This must be done before making calls
to
any
of the other device driver functions that move device components.
At the very least, the initialization call is responsible for setting the counter that is used
for delays when communicating with the hardware. The protocol is allows initialization
of selective parts
of
the system. The parts
of
the system include:
■
monochromator scan drive,
■
shutters,
■
slits, and
■
internal variables (delay counter and device position table}.
The parameters that are passed to the call will vary depending on what is being
initialized. If the monochromator is being initialized, then the calibration position
On
steps} must be passed. If the slits are being initialized, then the maximum width
of
the
slits must be passed in the same fashion. How the driver interprets the parameters is
determined by the first parameter, which will be interpreted as the summation
of
the
numbers in the left column
of
the following table: -
Revised
November
24.
1992
61
Leica Microsystems, Inc.'s Ex. 1033
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