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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