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Note 6 –Group-Volume/Mute commands (*CW,62/63/64/65/66/67/68/69):
Volume levels are reported for each zone defined in the group. Group commands apply to a group of eight consecutive
zones, as defined in the command by gbz and gzd. Parameter gbz is group-base-zone, and gzd is group-zone-definition,
which define a group of up to eight zones. If the group is defined such that the zones are on different switchers, the returned
messages will collide and be garbled – therefore, gbz should be restricted to 8-zone increments (1, 9, 17...).
Each bit in gzd corresponds to one of eight zones, with bit-0 (LSB) being the lowest zone, and the bit-7 (MSB)
being the highest zone. If the bit is 1, the zone is included in the group, and if the bit is 0, it is excluded.
The first zone (selected by bit-0) is defined as group-base-zone gbz. The next seven bits in gzd correspond to the
next seven zones above gbz. For example, if gbz = 9 and gzd = 155, the group includes zones 9, 10, 12, 13, and 16.
First, choose gbz, then to select the appropriate gzd, you need to set the gzd bits corresponding to the desired zones.
Zone
9 = gbz
10
11
12
13
14
15
16
Therefore, when we choose gbz = 9, and set the appropriate bits in gzd to include zones 9, 10, 12, 13, and 16 in
the group, we need gzd = 155. You can get this gzd either by converting the binary value 10011011 to decimal,
or by adding the bit-values that correspond to the included zones (128+16+8+2+1 = 155).
For testing clusters, use the group commands but set gbz to cluster 1 to 8, and gzd to 0.
Note 7 –Volume Levels (vol, vvl, vvr, vra) are 2-dB/increment (except for 0 = -80dB):
35
+6 dB
34
+4 dB
33
+2 dB
32
0 dB (pass)
31
-2 dB
30
-4 dB
29
-6 dB
28
-8 dB
27
-10 dB
Note 8 – Bass/Treble Levels (bas, trb) are 3-dB/increment:
8
+12 dB
7
+9 dB
6
+6 dB
5
+3 dB
4
0 dB (flat)
3
-3 dB
2
-6 dB
1
-9 dB
0
-12 dB
bit-0
1
bit-1
2
bit-2
4
bit-3
8
bit-4
16
bit-5
32
bit-6
64
bit-7
128
26
-12 dB
25
-14 dB
24
-16 dB
23
-18 dB
22
-20 dB
21
-22 dB
20
-24 dB
19
-26 dB
18
-28 dB
1 (lsb)
1
1
2
0
0
1
8
1
16
0
0
0
0
1 (msb)
= 10011011 =
155 = gzd
17
-30 dB
16
-32 dB
15
-34 dB
14
-36 dB
13
-38 dB
12
-40 dB
11
-42 dB
10
-44 dB
9
-46 dB
20
8
-48 dB
7
-50 dB
6
-52 dB
5
-54 dB
4
-56 dB
3
-58 dB
2
-60 dB
1
-62 dB
0
-80 dB
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