3. Details of the AVIOLYT
Upgrade Kit
Upgrading an instrument in this context
means to make it an LMT driven instrument
that has access to all features provided by
Leica's concept of the Photogrammetric
Workstation.
Detailed goals of upgrading AVIOLYT in-
struments are
1 to assemble the modern hardware com-
ponents of the SD2000 (see 3.1 below);
2 however, to support as many features
typical of the original AVIOLYT instru-
ments as can be reasonably achieved
(see 3.2 below);
3 to alow BC users to replace old-
fashioned computer hardware (see 3.3
below);
4 to improve the photo illumination (see
3.4 below);
5 to give users the choice between
- changing to different application soft-
ware packages on one of the various
platforms;
* keeping their familiar AVIOLYT appli-
cation software. This is possible be-
cause the AVIOLYT application
software, running on PC-Unix plat-
forms, cooperates with LMT driven
instruments as well as with original
BC stereo viewers (see 3.5 below).
3.4 Replacement of Hardware
Components
The servo control electronics is replaced by
just two small electronic cards, one in the
BC's cabinet and the other one in a slot of
the LMT. The two cards are basically identi-
cal to those installed on the SD instru-
ments; these make the stages of the
upgraded BC move the same way as the
SD stages. The only difference between
the new BC cards and the SD cards are
2 This option will not be available for S9-AP upgrades
some extensions to support BC typical
features (see 3.2 below).
The linear encoders for measuring the cur-
rent stages positions establish the same
stage coordinate systems as the SD's
have.
After upgrading, the encoder input devices
of handwheels, footdisk and free hand con-
troller - called encoder devices in the fol-
lowing - are completely controlled by the
LMT software. So the stages can be driven
in many different ways: with handwheels,
footdisk and free hand controller, with dif-
ferent speeds and independently in XY and
Z; the computer mouse may be used as an
encoder device as well; moreover, a soft-
ware controlled joy stick mode and a high
speed mode, activated by very fast move-
ments of the encoder devices are
supported.
The BC free hand controller, which ope-
rates like a mouse, is removed. However, it
can optionally be replaced by the SD free
hand controller“, that allows for rotation-free
movements parallel to the X and Y axes.
3.2 Further Support or Equivalent
Replacement of Typical BC
Features
Like the original BC real-time processor
system, LMT supports the red toggle
switches for X, Y and Z which permit fast
movements over long stage distances. So
operators can choose between this kind of
fast movements and the two provided by
LMT anyway (compare 3.1 above).
The coordinate display in front of the stereo
viewer is replaced by the LMT's user inter-
face, displaying all components of photo,
model or ground coordinates at the same
time if required.
The original BC provides a b, adjustment,
performed by an incremental rotary button
for slow adjustment and a toggle switch for
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