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Saia-Burgess Controls AG
C
VGA MB-Panel BacklightOn use
C.1
Introduction
The PCD7D4xx VGA Terminal allows the use of adjustable «BackLightOn».
The following is supported:
● Back light intensity setting in 20 steps using the contrast setting in the setup menu.
This includes full dark to maximum intensity setting
● Back light intensity adjustment at run time using client/ browser based access over
an internal data control parameter (container uBT_Contrast).
This overrides the setup settings
● Automatic back light on switching at touch down on the screen.
Not adjustable
● Automatic back light off switching after a configurable time-out in the setup menu
● Back light off timer adjustment at run time using client/ browser based access over
an internal data control parameter (container uBT_BackLightTimeout)
This overrides the setup settings. A setting to 0 switches this automatic switching off
● Back light on/off control at run time using client/ browser based access over an
internal data control parameter (container uBT_BackLightOn).
The setting gets overridden by a touch down on any place on the screen (switch-
ing on) and by the LCD BacklIght timer timeout (switching off).
Note that at higher BackLight setting with uBT_Contrast, the light intensity gets
higher. This actually reduces the sensed contrast.
Note:
uBT_BackLightOn is added in VGA FW 1.12.11 upwards.
For compatibility reason another container uBT_BackLight is kept in.
This container however can NOT be used with buttons and edit boxes.
It can be used for remote back light control over PPO.
It reflects the remote control state, not the actual back light state.
Switching the back light on:
A write from '0' to '1' to this container switches the back light on.
If the container is '1' before however nothing happens in that case.
Switching the back light off:
A write from '1' to '0' to this container switches the back light off.
If the container is '0' before however nothing happens in that case.
To get a defined behaviour it is recommended to use always a two toggle sequence
writing '1','0' to switch it off and '0','1' to switch it on.
For new applications it is recommended to use uBT_BackLightOn instead that can
be used directly.
Manual PCD7.D4xx │ D ocument 26-851 ENG12 │ 2 016-02-05
Appendix C
Introduction
C
C-1
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