Standby" Command; Picture Mute" Command; B.7.2 "Standby" Command - VDC Display Systems MARQUEE 8521 Ultra Green User Manual

This section includes additional notes about some of the more complex RS-232 messages.
B.7.2

"Standby" Command

During standby entered via normal keypad-projector operation, the picture is blanked, the audio is
muted and you can perform no operation from the keypad except to "get out of standby". This type of
standby occurs when you use the Standby key on either the keypad or Marquee switcher (available
only from Presentation level), when you use the Picture Mute key on the Extron switcher, or when
you send RS-232 standby keycodes from a controller.
The RS-232 "set standby" command triggers a significantly different type of standby. This standby
command blanks the picture and mutes the audio as usual, but you can still execute most other
projector commands as well — you are not locked out. In addition, note that it is not necessary to be
in presentation mode in order to enter standby via the RS-232 command.
WHILE IN STANDBY...
the picture and audio are both off.
•
you can issue other projector commands as desired.
•
a request of Contrast, Brightness or Audio Mute reports the value that will be
•
restored after coming out of standby.
•
any Picture Mute command is ignored.
•
switcher slot buttons do not function.
•
commands causing an unblanked picture take effect only after leaving standby
•
mode (exit via a keypress or RS-232 methods).
•
the amber LED status light is lit on the projector and connected switcher.
•
LEAVING STANDBY...
Exit standby via a keypress or RS-232 method. The amber LED status light will
B.7.3

"Picture Mute" Command

The RS-232 "set pic mute" command blanks only the picture — the audio is not affected. Otherwise,
this command is similar to the RS-232 "set standby" command. You can use most other projector
commands while in "pic mute" mode. Note that it is not necessary to be in presentation mode in
order to enter Picture Mute via the RS-232 command. Note also that a Picture Mute command is
ignored if you are already in any form of standby.
WHILE IN PICTURE MUTE...
the picture is off but the audio is on
•
you can issue other projector commands as desired.
•
commands causing an unblanked picture take effect only after leaving picture
•
mute mode (exit via a keypress or RS-232 methods).
•
a request of Contrast or Brightness reports the value that will be restored after
•
coming out of Picture Mute.
•
the amber LED status light is lit on the projector and connected switcher.
•
LEAVING PICTURE MUTE ...
Exit Picture Mute via a keypress or RS-232 method.
Note: You have no way of knowing that a projector has only the picture muted rather than being
in standby except if you hear audio from the current source. If you mistake Picture Mute for
Standby and try to leave by pressing the standby key, you will enter standby rather than
leave it. Press the standby key once again to leave standby and restore the picture.
Display Systems
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Appendix B
go out.
B-13