Instruction Manual

13
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 eld. 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 eld 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
eld 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 eld. 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