Commits on Feb 1, 2019

1. M308: Generic Heater Control …

   Parameters:
   
    * Pnnn Heater index
    * Snnn Target active temperature  (note 1)
    * Rnnn Target standby temperature  (note 1)
    * Tnnn Heater state: 0 = off, 1 = standby 2 = on. (notes 1,2)
   
   This command allows direct control of heaters without having
   to know whether a heater is a bed, chamber, tool or some other
   type of heater.  It does not replace any existing G or M code
   commands and is meant more for use from the command line and
   by user interfaces.  Although nothing prevents it, this command
   should not be used by slicers. They should continue to use the
   standard control commands.
   
   The P parameter is required and selects the heater.  There is no
   default so the minimum command is M308 Pnnn which prints the
   heater's current state, target active temperature, target standby
   temperature and the current temperature as follows:
   
   "Heater 1 State: 'Off', Active temp: 225.0°, Standby temp: 190.0°,
   Current temp: 23.2°"
   
   The S and R parameters are optional and set the target active and
   standby temperatures.
   
   The T parameter is also optional and if supplied, sets the heater's
   current state where 0 = off, 1 = standby 2 = on.
   
   Examples:
    * M308 P0 S70 R50
      Set heater 0 (usually but not necessarily the bed) target
      active temperature to 70 and the target standby temperature
      to 50.  Since the T parameter is not supplied, the heater's
      current state is not altered.
   
    * M308 P0 T1
      Set heater 0 to standby.  Any previously set standby temperature
      is preserved, even if set by another command such as M140, M141,
      G10, etc.
   
    * M308 P1 S225
      Set heater 1 (an extruder maybe) target active temperature to
      225 leaving its target standby temperature and state alone.
   
   Notes:
   (1): Since the T parameter explicitly controls the state of the
        heater, no special importance is placed on temperatures less
        than -273.  They will NOT turn the heater off as they may in
        other commands.
   
   (2): This command will return an error if an attempt is made
        to set the temperatures or state of a heater in "fault"
        or "tuning" state.  Use the appropriate commands to return
        the heater to a working state before re-issuing this command.
   
   Special considerations when a heater is assigned to a tool:
   
   Attempting to change the state of a heater that is assigned to
   the current tool when the printer is in the Printing, Pausing,
   Paused or Resuming state will result in an error.  This is to
   prevent an accidental disruption of a print.
   
   Changing the temperatures of a heater assigned to a tool will also
   change the tool's defined active and standby temperatures.

   

   gtjoseph committed Feb 1, 2019
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