Hatteland Display 26 inch - HD 26T21 MMC (Widescreen) - Manual (Page 13)

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Serial/Ethernet Communication (SCOM) Interface
IND100084-14
"BRT" - User Brightness Control
This command is sent to the unit to command the backlight brightness control setting.The brightness value shall be
sent as one byte in the DATA field. A setting of 0x00 will indicate off. A setting of 0xFF (255 in value) will indicate
maximum brightness. Intermediate values will control brightness over the range from minimum to maximum
luminance. LEN = one data byte.
After any power cycle the BRT will be set to 100%.
If the data checksum is valid and the brightness was set, the unit will reply to this command with an ACK attention
code. The DATA field in the reply shall indicate the resulting brightness control setting. If an invalid checksum was
received and the message was not Broadcast and RS-485, the unit will reply with an NAK attention code. The DATA
field in the reply will indicate the current brightness control setting.
Example:
If BRT is 100%, the user can adjust the brightness from 0-100%. If the BRT is set to 60%, the visual brightness is set
to 60%. The user can adjust the brightness from 0-100% within the 60% set by BRT. If the user sets the
potensiometer to half, the visual brightness will be 30% (half of 60%). If BRT is set back to 100%, the visual
brightness will be 50% (half of 100%).
Command to set 60% Brightness:
0x07 0xFF 0x42 0x52 0x54 0x01 0x10 0x99 0x66
Acknowledge was set to 60% Brightness:
0x06 0xFF 0x42 0x52 0x54 0x01 0x11 0x99 0x66
Negative Acknowledge 40% Brightness:
0x15 0xFF 0x42 0x52 0x54 0x01 0x02 0x66 0x99
"BRU" - Glass Display Control™ (GDC) Brilliance Button
This command shall be sent to the unit to command the user brightness control setting. The brightness value shall be
sent as 1 byte in the DATA field. A setting of 0x00 shall indicate off. A setting of 0xFF shall indicate maximum
brightness. You can send "?" to retrieve the current value/status of the LED's.
Example:
Command to set 60% Brightness:
0x07 0xFF 0x42 0x52 0x55 0x01 0x09 0x99 0x66