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Revision to Connecting an LCD control panel

Ian A-S

When the PanelDue was originally designed, there was not the variety of machines there are now, and the PanelDue hardware and firmware are not able to display some machine configurations cleanly. The PanelDue firmware (as of v1.23.2) assumes a fixed relationship between bed, tools and heaters. Please note the following:
-* PanelDue will display the first defined bed heater first, then iterate the defined tools. It then iterates the defined heaters below this. It expects a 1:1 relationship between tools and heaters. This means if you have a machine that uses one heater for more than one tool (eg a 2-into-1, filament-swapping hot end), it will display more tools than heaters.
+* PanelDue will display the bed heater H0 first (even if it is disabled), then iterate the defined tools. It then iterates the defined heaters below this. It expects a 1:1 relationship between tools and heaters. This means if you have a machine that uses one heater for more than one tool (eg a 2-into-1, filament-swapping hot end), it will display more tools than heaters. Tools may not line up with their respective heaters.
* Conversely, if you have more heaters defined than tools (eg extra bed heater/chamber heater), you'll have more heaters than tools.
* The PanelDue also iterates the heaters from the first defined heater to the last, including all heaters in between, whether defined or not. This means if you have a heater defined on H0 (bed) and one on H5 (Duex output), it will show all the ones in between, eg H0, H1, H2, H3, H4 and H5. For and example, see https://forum.duet3d.com/post/136207 . Ideally, configure heaters on consecutive heater connections.
-* Due to constraints on display resolution, PanelDue can only display 7 heaters in total. If there are more defined heaters than this, some columns will overlap.
+* Due to constraints on display resolution, PanelDue can only display 7 heaters in total. If there are more heaters and/or tools than this, some columns will overlap.
* PanelDue does not recognise Chamber heaters, or extra heated beds. It will show them as heaters, though.

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