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A value of '2' is never returned by the response string. If muting is disabled by the '2' (NoMute) com-
mand, a value of '0' will be returned to indicate muting is disabled.
'VMLZ' Set a Zone's Mute Level
The VMZ command allows you to mute the volume on the HDA800(V2). This differs from the MZ
command in that the MZ command is used to completely shut down a zone, whereas using the VMZ is
a volume based mute and allows all the volume features supported by the HDA800(V2).
These features include a mute level setting that allows you to mute a level by a specific amount, -20dB
for instance instead of a full mute.
The VMLZ setting is the value to be subtracted from the current volume when the mute command is
enabled. This value is the number of 0.5dB steps to be subtracted, for instance a setting of 40 would
subtract 20dB whenever the mute command is enabled. A setting of 248 will always do a full mute.
There are three different ways of muting the volume:
1
Jump immediately to the new mute volume.
2
Fade to the new level in the time given by the 'VMT' command.
3
Fade to the new level using the slope given by the 'VMT' command.
To fade to a new level over a given period of time, add 10000 to any mute level setting.
To fade to a new level at a given ramp speed, add 20000 to any mute level setting.
The format used to jump immediately to a new level is:
^VMLZ @zone,@zone,attn
^VMLZ @zone,+step$
^VMLZ @zone,-step$
^VMLZ ?$
^VMLZ @zone,@zone,?$
Response Strings:
^=VMLZ @zone,vol$
Where:
= One (or more) zones to be affected.
@zone
= Mute attenuation in 0.5dB steps.
attn
To jump immediately to a new mute volume, the range is 0 to 248.
To fade to a new level in a given time period the range is 10000 to 10248.
To fade to a new level at a given speed the range is 20000 to 20248.
'VMT' Set Muting (Fade) Times
The HDA800(V2) allows the mute command to be ramped over time (fading), this command sets the
ramp time and ramp speed used when muting volume. All zones share the same times.
There are two different ways to fade volume while muting.
1
Mute volume over a set period of time.
2
Mute volume at a controlled ramp speed.
The VMT allows setting both of these.
58
Set the mute attenuation of a zone or zones.
Add 'step' number of 0.5dB steps to current setting.
Subtract 'step' number of 0.5dB steps from current setting.
In polled mode, reads current settings of all changes.
Read current settings of given zone(s).
HDA800(V2) Serial Protocol, Version 1.3, 9/12/13
Audio Control
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