Miscellaneous notes

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    Miscellaneous notes...

• maintenance mode
• 05apr16
  
• switch inside the cabinet
• Only read at boot up, so cycle the power after changing the switch.
• it will:
• encoders not used
• only velocity mode. slower than normal mode
• az slave motor not used (back driven by the master).
• software limits not respected.
• To read hardware limit:
• enter maintenance mode
• drive to limit switch
• switch back to normal mode and read the encoder.
• limit switches
• 05 apr16
• software limits.
• in tracking mode, can't go beyond
• in velocity/rate mode. sets velocity to 0. 
• el: min 5.8, max: 88
• az; min -180, max:360..  (from acceptance test..)
  
• hardware limits
• 1st switch is hardware limit.
• Should normally not hit it (software limit protects .. unless 0 velocity creep)
• can only drive out in velocity mode.
• 2nd switch. backup limit. should never hit
• manual (operation II says you need special attention to get out.
• we manually flipped the switch. ended up rebooting system to get back.