NMEA DDC datagram format
The NMEA DDC (Display Dimming and Control) datagram format allows you to remotely control the colour palette and brightness of the EK80 display presentations.
Format
$--DDC,a,xx,b,c*hh<CR><LF>
Description
1 $—: Talker identifier
2 DDC: Datagram identifier
3 a: Display dimming
•  D = Daytime setting
•  K = Dusk setting
•  N = Nighttime setting
•  O = The display backlight is turned off.
4 xx: Brightness (Percentage)
5 a: Colour palette
•  D = Daytime setting
•  K = Dusk setting
•  N = Nighttime setting
•  O = The display backlight is turned off.
6 a: Status
•  R = The datagram is provided as a status report.
•  C = The datagram is provided as a command to change settings.
This datagram description is not complete. For more information, refer to the source specifications issued by National Marine Electronics Association (NMEA).
Related topics
NMEA datagram formats