MC850 Operations Manual Rev F
Page 10
Table of Contents
Top
Command Name and Description
Hex Command
Response
DECREASE ATTENUATION BY 3dB
Increases the signal level by 3dB on CHAN
1
0x02 0x01 CHAN
1
0x03
0x02 0x01 CHAN
1
LEVEL
2
0x03
INCREASE ATTENUATION BY 3dB
Lowers the signal level by 3dB on CHAN
1
0x02 0x02 CHAN
1
0x03
0x02 0x02 CHAN
1
LEVEL
2
0x03
DECREASE ATTENUATION BY 1dB
Increases the signal level by 1dB on CHAN
1
0x02 0x03 CHAN
1
0x03
0x02 0x03 CHAN
1
LEVEL
2
0x03
INCREASE ATTENUATION BY 1dB
Lowers the signal level by 1dB on CHAN
1
0x02 0x04 CHAN
1
0x03
0x02 0x04 CHAN
1
LEVEL
2
0x03
SET ATTENUATION LEVEL
Sets the attenuation to VALUE
3
(in dB) on
CHAN
1
0x02 0x05 VALUE
3
CHAN
1
0x03
0x02 0x05 CHAN
1
LEVEL
2
0x03
MUTE TOGGLE
Toggles mute for CHAN
1
0x02 0x6 CHAN
1
0x03
0x02 0x06 CHAN
1
STATE
4
0x03
MUTE ON
Mutes CHAN
1
0x02 0x7 CHAN
1
0x03
0x02 0x07 CHAN
1
STATE
4
0x03
MUTE OFF
Un-mutes CHAN
1
0x02 0x8 CHAN
1
0x03
0x02 0x08 CHAN
1
STATE
4
0x03
GET ATTENUATION
Return CHAN
1
attenuation level in dB
0x02 0x09 CHAN
1
0x03
0x02 0x09 CHAN
1
LEVEL
2
0x03
GET MUTE
Return the mute status of CHAN
1
0x02 0x0A CHAN
1
0x03
0x02 0x0A CHAN
1
STATE
4
0x03
1
CHAN selects the channel affected as follows:
0x00 = All channels
0x01 = Channel 1
0x02 = Channel 2, etc.
2
LEVEL is the attenuation in decibels (dB), expressed as a hexadecimal (0x00 . . . 0x50)
3
VALUE is the desired attenuation in decibels (dB), expressed as a hexadecimal (0x00 . . . 0x50)
4
STATE is in the mute status where 0x00 is un-muted; 0x01 is muted
Note that the RS-232 level (attenuation) is
in addition to
the individual channel level and master level. If,
for example, the individual channel level is set at 12 dB and the master level is set at 8 dB, then a 7 dB RS-
232 level will result in 27 dB of attenuation relative to full power. Also, the individual channel mute button
and the RS-232 command will mute the channel.
Both
need to be “unmuted” to restore output to the
loudspeaker. RS-232 settings are retained even if power is removed from and restored to the device.
6.1.3
Speaker Connections
6.1.3.1
Channel-by-Channel Power Allocation (All Models)
Stewart Audio has incorporated channel-by-channel power allocation into the MC850 amplifiers to
further enhance deployment flexibility. Each output can be configured to deliver up to 100W
maximum audio power,
with the limitation that the
total
audio power from outputs 1-4 cannot
