270M
Rapid
Scanning
Imaging
Spectrograph
4.
Go back
to
the Index position.
To close the shutter, repeat the above steps except that in step 2 set
DIR
= high.
The reset dose little
or
nothing for system initialization
or
calibration
of
the Wavelength
Drive
or
Slits. Once power has been applied it is the software that must position these
devices
to
their optical starting positions.
4.9.3
Programming
tip:
For those cases where more than one device is
to
be moved at the same time, the
program should first select and change states for shutters, if appropriate
to
protect
against inadvertant exposure of the detector. Next start the DC motors for the turret or
side mirrors moving if needed. Then step the slit or wavelength motors, as they can be
controlled while the DC motors are
in
motion. Finally, open the shutter when ready to
expose the sample or detector. Before taking data, allow sufficient time for the slowest
device that you moved
to
reach its new position.
When finished setting accessories to the desired positions the state counter should be
returned
to
the INDEX position (state
(a}.
This will keep power consumption down.
4.10 Signal Descriptions
■
· SELECT
This signal is used
to
select the device
to
be operated. It is a static level which rests
high
or
low as
you
move from one device
to
the next.
When power is first applied
to
the 270M Controller Card, a reset pulse is developed.
Among other things this pulse initializes the internal State Counter
to
the IDLE State
(state 4).
If the host computer
or
controlling device has the SELECT signal asserted LOW
(O}
· the state counter will remain in the IDLE state. Once the SELECT signal is asserted
HIGH the state counter moves
to
the Entrance Mirror state (state 5). -
Further transitions
of
the select signal will cause the state counter
to
advance
to
successive states.
Revised
November
24,
1992
15
Leica Microsystems, Inc.'s Ex. 1033
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