Hatteland Display 13 inch - HD 13T21 MMC (Widescreen, Inte Cor2 Duo CPU) - Manual (Page 30)

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Operation
User Controls
USER CONTROLS OVERVIEW
The units are designed by using Glass Display Control™ (GDC) touch technology to allow interactivity adjusting
brilliance (brightness) and control power on / off with the use of illuminated symbols. Note that these symbols are
only visible (backlight illuminated) when suitable power is connected. There is no physical moving knobs, potmeters,
wheels or push buttons available as everything is touch surface controlled by Projected Capacitive technology, that
allows a human finger (including several types of gloves) to control the unit.
Note: Illustration below shows 13 inch unit, but same functions applies for both 8 and 13 inch units.
Note: For Application Programming Interface (API) usage, please review dedicated chapter in this manual.
Programmable Alarm LED Power On/Off
Light Sensor Brightness Adjust - Brightness Adjust +
Note: All Glass Display Control™ (GDC) buttons are monitored by an internal touch controller that are part of the full
Touch Screen controller of the unit. During booting of Operating System the GDC buttons may appear unresponsive
during this time or shortly after the boot. Please allow 25 to 35 seconds after you first see the Operating System
desktop to allow the touch controller to re-calibrate its touch sensors. This calibration is required to get a stable
operation for both GDC buttons and the full Touch Screen. After approx 35 seconds the GDC buttons and Touch
Screen driver is fully operational. If there are additional heavy drivers or software booting up at the same time as
Operating System is booting, additional seconds may be required to complete the calibration.
Light Sensor:
Used to sense level of ambient light in the surrounding environment. The sensor data can be read by suitable software
through the Hatteland Display SCOM functionality of the unit and thus can be used to control brightness remotely.
Note: This sensor is not visible for the eye or has any illumination behind to indicate it’s position. Further, by touching
or covering this area will naturally make the sensor data inaccurate.
API Interface: This input can be read with the “ AMBIENT_LIGHT_SENSOR ” command.
Programmable Alarm LED:
Used to indicate an Alarm or similar functionality. The logic to this LED can be programmed through customized API
which gives access to controlling its function and for instance setup blinking patterns. Note: This LED (when not
activated) is not visible for the eye or has any illumination behind to indicate it’s position. Further, by touching this area
no action will be performed or has been assigned.
API Interface: This functionality can be controlled using the “ ERROR_LED_EN ” and “ ERROR_LED_DIS ”
command.
Buzzer (not visible)