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A Prototype Optical Tracking System Investigation and Development - page 159 / 170

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F.3 Marker Lost (ML)

145

F.3

Marker Lost (ML)

Field Name

Field Description

Field Type

Centroid ID

The ID of the centroid within the ROI that was lost.

Integer

Sent by a module to the hub when a marker is lost. This occurs when the camera module movement is too great causing the marker image to no longer be within the bounds of its ROI. More commonly this occurs when the marker image leaves the camera module’s FOV.

Fields:

F.4

Request Data Packet (RQ)

Sent by the hub to a module to indicate that it should use the bus to transfer any data it has waiting for the hub.

Fields: Header only.

F.5

Request

ll Data Packet (RQ )

Sent by the hub to the broadcast address (all modules) to indicate that they should begin sending their data in the time slots set using the STDM packet

Fields: Header only.

F.6

Set Time Slot Packet (STDM)

Sent by the hub to a module to indicate the time slot that the module receiving the packet should use.

Fields:

Field Size in Bits

16

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