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SHARCS Problem: All Zero Read-out

Manifestation:

  • In sharcs_fe status reports: Exposure aborted (read timeout)...
  • Following detector read-out, ShARCS display indicates all pixel values equal to 0.

Solution/Recovery:

Re-start ShARCS server:
  • Exit (sharcs_fe) GUI: File...; Exit.
  • user@covert.ucolick.org > /usr/local/lick/bin/ao status sharcs
  • user@covert.ucolick.org > /usr/local/lick/bin/ao restart sharcs
  • From VNC pull-down menu select: ShARCS UI. Or, in VNC xterm issue command: sharcs_fe.
  • In sharcs_fe GUI select: Windows...; Setup...; Connect.
  • In sharcs_fe GUI select: Windows...; Setup...; Init.
  • Take test exposure to verify.

Cause:

  • Sometimes provoked by power-cycle of stealthie.ucolick.org.
  • Sometimes provoked by re-sizing window to full 2048 x 2048 array from sub-array.
  • Any time stealthie is shutdown, it will be necessary re-start the sharcs server after it is back up.

Associated Issues:

Change Log:

2019-02-01: Updated.
2018-04-02: Updated.
2017-06-06: Updated.
2017-01-10: Updated.
2016-12-15: First version.

This document last updated (UTC): Tuesday 04 March 2025