Appendix B
Display Systems
B-17
B.7.9 Color Temperature Modify Command (CTM)
Use this message to set (alter) or get the red, green and blue levels present for a defined color temperature. This command does
not
select a color
temperature.
Table B-7. Color Temperature Command (CTM)
•
Value Range: 0 = 3200K, 2 = 6500K, 3 = 9300K, 5 = source custom, 6 = white balance
Message = Adjust Color Temperature
Parameter
Name
Description
P1
(3 bytes)
Which adjustment
byte 1: 0 = G2,
1 = drive,
2 = white balance
8 = Save to Eeprom
9 = Restore from
EEprom
byte 2: 0 = red,
1 = green,
2 = blue
byte 3: 0 = 3200K,
1 = 5400K(Future),
2 = 6500K,
3 = 9300K,
5 = source custom
P1 is made of three characters. The first specifies G2, drive or white balance, the second red, green or blue, and the third
what to set.
Example:
0,2,3 specifies an adjustment of blue G2 for the 9300K temperature setting.
2 specifies an adjustment to the white balance setting Bytes 2 & 3 are not relevant (but must be used anyway) when
adjusting white balance
P2
(2 bytes)
value
0-4095, G2 (12 bits) (MSB,LSB) (most significant digit, least significant digit)
0 - 255, drive (8 bits) (0,LSB)
0 - 255, white balance (8 bits) (0,LSB)
Message = Read Color Temperature
P1
Which adjustment
Specifies which color temperature adjustment to return.
Reply to Read Color Temperature Message
P1
Which adjustment
Specifies which color temperature adjustment to return.
P2
value
The value of the specified adjustment
Example - Color Temperature Modify:
010b 00 00 03 ff 52 00 00 02 08 00 00 0e = set 6500K red G2 to 2048.
Saving and Discarding Modified Color Temperature Values
Writing to hardware will change values & save values in shadow EEPROM memory structure but will not save permanently to EEPROM for next
power up. You must use the
Save
command to do this — this save applies only to the currently selected temperature,
not
all temperatures When
byte 1 of P1 is used for the save or restore operation, the rest of the message is unused.
If the requested data is unrecognized, no message is returned. If the requested adjustment is invalid (out of range), no adjustment is made.
If you query a parameter for a color temperature other than what is currently selected, a switch to the queried temperature
may
occur.
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