Enable a specified set of telescope axes, and disable the rest.

Arguments:

Axes axes

The set of telescope axes to enable.

Example 1:

The following example enables the azimuth and elevation axes, but leaves the deck axis disabled.

 axes az+el

Example 2:

The next example enables all axes.

 axes all

Context:

When the control-system is started, no telescope axes are enabled. This means that all of the drive-amplifiers are turned off, and that brakes are applied to axes that have them. The axes command must then be invoked to enable the set of telescope axes that are to be driven. This is generally all telescope axes. However there are many potential reasons for wanting to only drive a subset of the telescope axes.

For example, if a deck-drive problem causes the PMAC to shutdown the drive-system whenever any attempt is made to run the system with the deck active, then to get the telescope back to stow, where the problem can be worked on, one can just enable the elevation and azimuth drives, and slew them back to stow, while leaving the deck drive turned off.

Another example would be during fast azimuth scans, during which one might want to avoid the potential for instability between the azimuth and deck drives, by turning off the deck drive, and avoid elevation servo-jumps, by turning off the elevation drive.

After a stall, which causes the PMAC to disable all axes, the axes command can also be used to re-enable the current set of axes. The motion-command that was running at the time of the stall, will automatically restart when this is complete.