270M
Rapid
Scanning Imaging Spe~trograph
Given:
width = desired slit width in microns
microns _per_ step = number of microns per step
Find:
step = step position
to
move slit to yield the desired slit width
Solution:
step = width / microns _per_ step
Example:
Let the desired width be 2000 microns and let there be 12.5 microns per step. Find
the required step position.
step = 2000
µm
/ (12.5 µm/step) = 160.0
2.4 Device Calibration:
The device driver maintains an internal table that contains the current position in steps
for all devices in the system. When there is a need to make a correction
to
the
position that is in the table, "Calibrate"
is
the function call to make. The function call
expects to be given the device hardware number of the device to calibrate, as well as
the value
to
set the current position to.
SYNTAX:
"C [HWARE NUMBER] [VALUE];"
EXAMPLES:
°C
0 12000;" - tell driver that the monochromator is at the step position 12000.
He
10 2000;• - tell driver that the side exit slit is at the step position 2000.
2.5
To
Query a Device:
This function is very similar
to
the calibrate device function. But rather than writing a
value
to
the internal device driver table, we read from it. The device driver responds
by placing an ASCII numeric string telling the step position
of
the requested device
into an internal buffer. The contents of the internal buffer become known
to
the caller
only when the device is read (see 6).
SYNTAX:
Reviaed
November
24,
1992
65
Leica Microsystems, Inc.'s Ex. 1033
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