B&B Electronics OP10 - Manual - Manual (Page 34)

2.5.15 Chief button
Click in the toolbar to pop a Chief Button dialogue box.
Click [New] to add “Å” button. Set the function as “set M0 on”.
The button of OP10 can be set for chief function. The priority order from high to low is:
basic function > local button > Chief button. So if there is a [Å] on the screen, OP10 will execute
the function which on the current screen when the button is pressed.
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