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8. Q: How does the tracker output offset?

Answer:

Send command:   AA 55 20 02 FF —— output offset

AA 55 20 00 FF —— don’t output offset

Output format: BB 01 XL XH YLYH 02 CS (CS: sum of all bytes modulo 256)

For example: BB 01 2A 01 80 FE 42 A7

X-axis offset 0x012A–> 298  Y-axis offset 0xFE80–> -384 (relative to the center point deviation pixel point: right positive, left negative, bottom positive, above negative)

When sending stop tracking command, it will feedback: BB 01 00 00 00 00 20 DC

Viewlink Protocol: the center point is 0, the center coordinate of offset (0,0)

Subtract (960, 540) from the pixel coordinates of the locked targets

1 Frame Header 0xBB  
2 Address 0×01  
3 X-axis offset LSB  
4 FSB  
5 Y-axis offset LSB  
6 FSB  
7 Status   BYTE0  0: Don’t display tracking box1: Display tracking boxBYTE1  0: No target

 

1: Tracking target

BYTE2  0: EO

1: IR

BYTE3  0: Single image display

1: PIP display

BYTE4  0: Within preset temperature

1: exceed preset temperature

BYTE56  Secondary tracking change status

in circle, 3 status in total: 1, 2, 3

BYTE 7  Reserved

8 Checksum