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IRotatorV3Position Property

Current instantaneous Rotator position, allowing for any sync offset, in degrees.

Namespace:  ASCOM.DeviceInterface
Assembly:  ASCOM.DeviceInterfaces (in ASCOM.DeviceInterfaces.dll) Version: 3c9121baba46811fe6e53a58a05935662261416d
float Position { get; }

Property Value

Type: Single
PropertyNotImplementedExceptionIf the property is not implemented.

SPECIFICATION REVISION - IRotatorV3 - Platform 6.5

When CanSync is True, Position reports the synced position rather than the mechanical position. The synced position is defined as the mechanical position plus an offset. The offset is determined when the Sync(Single) method is called and must be persisted across driver starts and device reboots.

If CanSync is False, this property must return the same value as MechanicalPosition.

The position is expressed as an angle from 0 up to but not including 360 degrees, counter-clockwise against the sky. This is the standard definition of Position Angle. However, the rotator does not need to (and in general will not) report the true Equatorial Position Angle, as the attached imager may not be precisely aligned with the rotator's indexing. It is up to the client to determine any offset between mechanical rotator position angle and the true Equatorial Position Angle of the imager, and compensate for any difference.

The optional Reverse property is provided in order to manage rotators being used on optics with odd or even number of reflections. With the Reverse switch in the correct position for the optics, the reported position angle must be counter-clockwise against the sky.

See Also