Command GetPositionKnown :

Finds out whether the physical position of this axis is known.
If false and the motor has an encoder with reference mark,
run command `Home`.

GetPositionKnown Definition
Input Argument	Tango::DEV_ULONG	axis number
Output Argument	Tango::DEV_BOOLEAN	true: physical position is known false: physical position is not known
DisplayLevel	OPERATOR	..
Inherited	false	..
Abstract	false	..
Polling Period	Not polled	..
Command NOT allowed for	FAULT OFF	..