AMX VST Instruction Manual page 38

ViewStat Programming Protocol
Auxiliary Information Commands (Cont.)
Command
BLTRIG
Backlight Trigger
BLTON
Turn Backlight On
ENTR
Enter Button Status
SCUP & SCDN
Scroll Up And Scroll Down Button
Status
34
Description
A photosensor is integrated on the thermostat circuit board to put the dis-
play backlighting (both the segmented display and the text messaging dis-
play) in a ready state depending on the intensity of the ambient light. This
command is used to select a relative intensity. Setting this value to 0
means that the ambient light must be lower (room darker) for the backlight
to enter a ready state while a 1 means that the ambient light must be
greater (room lighter).
Syntax:
SN[address] BLTRIG=0 or 1
Variables:
• 0 = darker
• 1 = lighter
Reply Format:
SN[address] BLTRIG=0 or 1
Entering this command turns on the backlighting for both the segmented
display and the text messaging display regardless of whether or not the
backlight is in the "ready" state. The backlighting stays on continually for
10 seconds and is then turned off.
Syntax:
SN[address] BLTON
Reply Format:
SN[address] BLTON
An Enter button is located below the text messaging display of the thermo-
stat. This button is used to enter a selection within a menu. Automation
system programmers can use the changing state of this button to integrate
the text messaging display into the automation system.
This command is a status update command and is used to report when the
state of the button (from inactive to pressed or from pressed to released)
changes.
This command can not be used to change the state of a variable. State
change reporting is controlled by means of the corresponding change of
state commands (C11 - see Change of State command section). This
command will not respond when an inquiry request is sent from the host.
Reply Format:
SN[address] ENTR=0 (Pressed) or 1 (Released)
Two buttons are located next to the text messaging display of the thermo-
stat. The top button is used to scroll up to various selections within a menu
while the bottom button is used to scroll down. Automation system pro-
grammers can use the changing state of these buttons to integrate the text
messaging display into the automation system.
These commands are status update commands only and are used to
report when the state of the button (from inactive to pressed or from
pressed to released) changes.
They can not be used to change the state of a variable. State change
reporting is controlled by means of the corresponding change of state
commands (C9 and C10 - see Change of State command section).
These commands will not respond when an inquiry request is sent from
the host.
Reply Formats:
SN[address] SCUP=0 (Pressed) or 1 (Released)
SN[address] SCDN=0 (Pressed) or 1 (Released)
ViewStat Communicating Thermostat - Programming Protocol Reference Guide