2. Q: How to query camera status?

Answer: F series:

Photograph /record action command: 81 01 04 68 xx FF

xx =:

01 Take a photo

02 Start record

03 Stop record

04 Reverse recording status

05 Switch to record mode or picture mode

Query video/photo status: 81 09 04 68 FF

Camera feedback:

81 09 04 68 00 FF  Stop recording

81 09 04 68 01 FF  Recording

81 09 04 68 10 FF  Photo mode 

T series:

Query SD card status command:

7E 7E 44 00 00 8B 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 CD

Feedback:

BB 09 01 01 02 00 00 C8  Recording

BB 09 01 01 00 00 00 C6  Stop record