270M
Rapid
Scanning Imaging Spectrograph
motors
or
to
strobe the position data
to
the shutter
or
DC motors. The maximum
repetition rate
to
the wavelength motor is 2560 hz. Do not exceed 400 hz for the slit
step motors.
The STEP line should be held high during any SELECT
or
DIRECTION signal
transitions.
■
INDEX
This line is asserted
low
when the state counter is at state O (the wavelength state) It is
used
to
mark the home position.
Once the INDEX position is found, one uses the SELECT line
to
advance
to
the
desired state. It is the responsibility
of
the host program
to
keep track
of
device
selections. It should
be·
noted that only one device may be selected at a time.
■
SENSE
The SENSE signal is used
to
report device status
to
the host. A LOW indicates an
active SENSE condition. The meaning
of
the SENSE depends
on
the devices selected.
Shutter SENSE:
When a shutter is selected, SENSE will be low
to
indicate the shutter is closed, and
high
to
indicate open. There is
no
feedback from the shutter
to
indicate the shutter's
actual position. The SENSE is simply a logic indication
of
the last attempt
to
operate
the device.
DC Motor Position SENSE:
A low is asserted if the device selected has been positioned in the preferred position.
As in the case
of
the shutter this is a logical indication
of
the last attempt
to
set the
device direction.
Half Step. (Slit) Driver SENSE:
Outputs an alternate PHASE condition
of
3 high and 5 low SENSE signals. This is
accomplished with feedback from the motor driver circuits.
Revised
November
24,
1992
17
Leica Microsystems, Inc.'s Ex. 1033
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