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The 1st parameter of the VMT command is the 'ramp time' setting. This indicate the amount of time
needed to ramp (or fade) from one volume to the next and is given in 1/10th of seconds. The setting of
10 would equal 1 second. This is the value used when 10000 is added to the VMLZ command setting
(See "'VMLZ' Set a Zone's Mute Level" on page 58).
The 2nd parameter is the 'ramp speed' setting. This is given in 0.5dB steps per second. The setting of
40 would equal a 20dB per second ramp speed. This is the value used when 20000 is added to a the
VMLZ command setting.
The VMT command format is:
^VMT time,speed$
^VMT ?$
Response Strings:
^=VMT @time,speed$
Where:
time
= Volume ramp time in 1/10th increments. 1 = 0.1 second, 10 = 1 second, etc.
speed
= Volume ramp speed in 0.5dB per second increments. 40 = 20dB per second ramp.
'BLZ' Set Zone's Balance
Each zone has a balance level that can be set from 0 attenuation (full left), to 400 (full right).
Balance is set in 0.5dB steps.
Command format:
^BLZ @zone,@zone,bal
^BLZ @zone,+step$
^BLZ @zone,-step$
^BLZ ?$
^BLZ @zone,@zone,?$
Response Strings:
^=BLZ @zone,bal$
Where:
= One (or more) zones to be affected.
@zone
bal
= Balance in 0.5dB steps from left to right, 200=Center. Range is 0 to 400.
The balance command is given in 0.5dB steps and uses an offset of 200 to indicate center, 0 indicates
full left (no audio on right channel), 400 indicates full right (no audio on left channel).
The balance command does not add gain, it only attenuates. Moving the balance to the left will lower
the volume on the right channel, but does not increase the volume on the left channel.
The value 200 is "center" and allows audio to pass unaffected on both left and right channels.
'GAZ' Set Zone's Gain (Output Levels)
Each zone has a gain level that can be set from -24dB to +24dB. The gain control allows you to match
the volume levels of each zone to the sensitivity of the amplifiers used in each zone. This allows vol-
ume settings to sound the same for each zone, even when using different model/brand of amplifiers or
different model/brand of speakers.
Zone gain is set in 0.5dB steps.
HDA800(V2) Serial Protocol, Version 1.3, 9/12/13
Set the ramp time, and ramp speed.
Reads current settings.
Set the balance of a zone or zones.
Add 'step' number of 0.5dB steps to current balance.
Subtract 'step' number of 0.5dB steps from current balance.
In polled mode, reads current settings of all balance changes.
Read current balance settings of given zone(s).
Audio Control
59
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