Annotator Data Stream

The data stream to Edgar is driven by the Ionetrics Annotator. There are two layers to the data stream: a transport layer and a logical layer. The transport layer consists of raw frames to a frame grabber for the frame grabber interface, or raw packets to the network controller for the Ethernet interface. Edgar takes raw data from either interface and assembles it at a logical layer which consists of scans of interferogram data from either 1 or 2 detectors, plus annotation data.

The annotation data consists of 32 16-bit words at the end of each scan. The following table shows the contents of annotation block.

Word	Contents		Word	Contents
1	Year(1)		17	MaxB Location (Hi)
2	Day of Year		18	MinB
3	Second of Day (Lo)		19	MinB Location (Lo)
4	Second of Day (Hi)		20	MinB Location (Hi)
5	Microseconds (Lo)		21	ZPD Location (Lo)
6	Microseconds (Hi)		22	ZPD Location (Lo)
7	ScanNumber (Lo)		23	Detector ID, Gain
8	ScanNumber (Hi)		24	Various(2)
9	MaxA		25	Scan Size
10	MaxA Location (Lo)		26	Spare
11	MaxA Location (Hi)		27	Spare
12	MinA		28	Spare
13	MinA Location (Lo)		29	Spare
14	MinA Location (Hi)		30	Spare
15	MaxB		31	Spare
16	MaxB Location (Lo)		32	Checksum

The frame grabber mode is supported by the Arvoo Picasso line of frame grabbers, which provide both fiber optic and copper cable interfaces. Other CameraLink compatible frame grabbers may be supported in the future. The Ethernet mode is supported by Anneth, the Annotator Ethernet interface.

(1)Bit 15 of the Year word is the Remote Start bit.

(2)Bit 15 of the Various word is the Local Capture mode bit; bit 14 is the Resolution bit for the Anneth Local Capture mode; bits 2 and 3 represent the Trigger Mode; bit 1 is the Scan Direction (0 for forward, 1 for reverse); and bit 0 is the White Light status bit.