Directed Perception PTU-D46 Series - Offset Position (Relative Offset); Resolution Per Position

PTU-D46 User’s Manual (v2.14.0) COMMAND REFERENCE
page 9
Related Topics
• Position (relative offset and desired position queries): See Section 4.3.2
• Position resolution (units): See Section 4.3.3
• Position limits: See Section 4.3.4
• Position execution modes: See Sections 4.3.6, 4.3.7 and 4.3.8
• Position limit enforcement modes: See Section 4.3.5
4.3.2 Offset Position (relative offset)
Description
Specify desired axis position as an offset from the current position, or Query
the current axis position. Desired offset positions can be changed on-the-fly
without waiting for previous position commands to complete.
Syntax
Query desired pan position: PO<delim>
Set desired offset pan position: PO<position><delim>
Query desired tilt position: TO<delim>
Set desired offset tilt position: TO<position><delim>
Example
The following sends the pan axis to position -500, then sends it 1500
positions to the left:
PP-500 *
A *
PO * Current Pan position is -500
PO1500 *
A *
PP * Current Pan position is 1000
Related Topics
• Position resolution (units): See Section 4.3.3
• Position limits: See Section 4.3.4
• Position execution modes: See Sections 4.3.6, 4.3.7 and 4.3.8
• Position limit enforcement modes: See Section 4.3.5
4.3.3 Resolution per Position
Description
Query returns the axis resolution per position moved (in seconds/arc).
Syntax
Query pan resolution: PR<delim>
Query tilt resolution: TR<delim>
Example
Resolution can be determined by:
PR * 185.1428 seconds arc per Pan position
1 sec arc = 1/(60 min arc * 60 sec arc) = .0002778°. So 185.1428 seconds arc
equals (185.1428 sec arc * .002778°) = 0.0514285°. Thus, to pan 21.3° left
requires a relative move of (21.3°/0.0514285°) ≈ 414 positions, yielding the
following command:
PO414 *