PDPRP Technical Telcon Position Update

PDPRP Technical Telcon Position Update

The Telcon Tcl/Tk code handles updating the the telescope coordinates in its main event loop. The coordinates are updated every 10seconds, unless there a camera is taking a picture at the time, or the VMG or some other camera is taking a multi-cycle observation and not letting the telescope move until it is done. In these two cases, the coordinates are updated as soon as the delaying condition goes away.

When the user clicks on the Flexure Update or Rotation Update button in the Telcon GUI, the C command routine, Cupfor is called which tells the C code how to update the coordinates when the Cupdate routine is called. If neither update button is selected, the Cupdate routine is still called, but the coordinates are not changed within it.

If the user ever goes to coordinates outside the solar disk, updating for rotation is automatically turned off. It must be manually turned back on if the telescope is moved back on the disk.

Once the coordinates have been updated, if the new values are more than 1" (either in X or Y) away from where the telescope is currently pointed, a new move command is issued (as long as we are permitted to move the telescope as described in the first paragraph) and a bunch of error checking is done to make sure things went well.

At the end of the loop, the time for the next update is updated and life goes on.

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sjk@begonias.bbso.njit.edu
12Dec97