Technical data

SightLine Applications Command and Control

Get Acquisition Parameters (0x38)

Get video port configuration. Causes a Current Acquisition Parameters (0x4F) message to be sent.

Byte offset Description

2 Length = 3

3 Type = 0x38

4 Video Port Index

Draw Object (0x3B)

Draw user specified overlay graphics on the screen.

All coordinates in this message are specified in with the center of the image at (0, 0) and the upper left

corner at (-image width/2, -image height/2).

Byte offset Description

2 Packet length = 15 (for non-text objects), variable for text

object types (>15)

3 Packet Type = 0x3B

4 Unique Object ID (1 to 255), refer to this ID to destroy a created

graphic object.

ID=0 is used for destroying all objects when Action=Destroy.

5 Action

0 = Destroy

1 = Create

Note that if destroy action is specified, then fields following this

are ignored.

6 Coordinate Properties

Value = 0 Reserved

Value = 1 Coordinates are specified in source coordinate

space. In addition, draw object is moved with

camera motion. This mode is useful for overlays

such as laser reticles.

Value = 2 Coordinates are specified in display coordinate

space. In addition, draw object is moved with

scene motion. This mode is equivalent to scene

mode tracking with a custom overlay.

Value = 3 Reserved