5.5.8.3. - Linked Configurations
An installation such as a synchrotron beamline uses many motors with
most associated with beamline control.
Spectrometers used for particular experiments
have
motors that aren't used in other experiments.
To avoid having to merge the motor configurations and settings
from one set of files to another when the spectrometer is changed,
you can set things up so that a single
version of the
config
and
settings
files will describe a number of different spectrometers.
Here is how to set up the files:
If you already have several geometry configurations installed,
you should make backup copies of the
config
and
settings
files from the current geometries.
If you already have several geometry configurations installed,
remove the
config
and
settings
files from all but one of the geometry
directories.
Save the
config
file that has the most motors, as you will have to add motors
from the other geometries to the remaining
config
file.
Set up hard links in all the geometry directories so that the
config
and
settings
in all the geometry directories refer to the same file.
For example, if the files already exist in the
fourc
directory, use the commands
ln fourc/config surf/config
ln fourc/settings surf/settings
to create hard links in the
surf
directory.
Don't use symbolic links.
Edit the
config
file by hand to add new control lines that
assign numbers to the different geometries.
These control lines must be before the lines that assign
motor information.
The format of the geometry control lines is as follows:
GEO0 = common
GEO1 = fourc
GEO2 = surf
GEO3 = fivec
etc.
The parameter
GEO0 always refers to the motors that are common to all the geometries.
Subsequent lines assign consecutive numbers to the other geometries.
Now run
edconf.
The motor screen will have a new field that lets you assign a spectrometer
geometry to each motor or to make the motor in common with all the
spectrometers.
You can do the same for each scaler on the scaler screen (as of release
4.03.12).
The hard links must be maintained for the
shared
config
and
settings
file scheme to work.
You can safely use
vi
and
cp
to manipulate the files.
However, using
mv
will destroy the links.
Also, the editor
ned
will destroy the links.
When running
edconf
with a geometry directory as an argument
or when invoking the
config
macro from spec, use the
G command to toggle between displaying all the motors and scalers in the
config
file and just those motors and scalers
used by the given geometry.
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