20
Compression (0x41)
Adjust the dynamic range compression setting.
Example
Command/response sequence to set compression to medium:
Command: 0x21 0x01 0x41 0x01 0x01 0x0D
Response: 0x21 0x01 0x41 0x00 0x01 0x01 0x0D
Request incoming video parameters (0x42)
Request the incoming video resolution, refresh rate and aspect ratio.
Example
Command/response sequence to request video parameters, where the video is
1280x720 (720p) 50Hz 16:9:
Command: 0x21 0x01 0x42 0x01 0xF0 0x0D
Response: 0x21 0x01 0x42 0x00 0x07 0x05 0x00 0x02 0xD0 0x32 0x00 0x02
0x0D
COMMAND:
Byte: Description:
St 0x21
Zn Zone number
Cc 0x41
Dl 0x01
Data 0x00 – Compression off
0x01 – Set compression to medium
0x02 – Set compression to high
0xF0 – Request current compression setting
Et 0x0D
RESPONSE:
Byte: Description:
St 0x21
Zn Zone number
Cc 0x41
Ac Answer code
Dl 0x01
Data1 0x00 – Compression off
0x01 – medium
0x02 – high
Et 0x0D
COMMAND:
Byte: Description:
St 0x21
Zn Zone number
Cc 0x42
Dl 0x01
Data 0xF0 – Request incoming video parameters
Et 0x0D
RESPONSE:
Byte: Description:
St 0x21
Zn Zone number
Cc 0x42
Ac Answer code
Dl 0x07
Data1 Horizontal resolution MSB (e.g. for 720p: 0x05 since 1280 = 0x0500)
Data2 Horizontal resolution LSB (e.g. for 720p: 0x00 since 1280 = 0x0500)
Data3 Vertical resolution MSB (e.g. for 720p: 0x02 since 720 = 0x02D0)
Data4 Vertical resolution LSB (e.g. for 720p: 0xD0 since 720 = 0x02D0)
Data5 Refresh rate for full image update (half the field rate for interlaced signals)
(e.g. for 50Hz progressive: 0x32)
Data6 Interlaced flag:
0x00 – Progressive
0x01 – Interlaced
Data7 Aspect ratio:
0x00 – Undefined
0x01 – 4:3
0x02 – 16:9
Et 0x0D
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