Stewart Audio AV25-2 RS232 - Manual (Page 9)

Command Names and Description Hex Command
VOLUME_UP
Increases the volume by 10%
0x02 0x76 0x75 0x03
VOLUME_DOWN
Decreases the volume by 10% 0x02 0x76 0x64 0x03
VOLUME_DISCRETE
Sets volume to a specific volume (rounded
to nearest 5%).
Range: 0x00 – 0x64 (0 - 100)
0x02 0x56 0xXX 0x03
MUTE_TOGGLE
Toggles mute between muted and un-
mated state.
0x02 0x6D 0x4D 0x03
MUTE_FORCE_MUTE
Forces the amplifier into a mute state.
0X02 0x6D 0x79 0x03
MUTE_FORCE_UNMUTE
Forces the amplifier into an unmuted state.
0X02 0x6D 0x6E 0x03
STATUS_VOLUME
Returns the current volume.
0x02 0x76 0x53 0x03
STATUS_MUTE
Returns the current mute state
0x02 0x6D 0x53 0x03
FIRMWARE_VERSION
Returns the current version in the format:
0x02 0xXX 0xYY 0x03
(XX = Version, YY = Revision)
0x02 0x44 0x56 0x03
If an invalid command is received, the device will respond with:
0x02 0x45 0x52 0x03.
This will appear as ER in a terminal console.
In response to a mute or volume command, the device will respond
with: 0x02 0x76 0xXX 0x03
The 0xXX will be the hex equivalent of the current volume.
4.3 RS232 Commands 5 Troubleshooting
Problem: Power indicator does not turn on.
Procedure: Check that the amplifier is plugged into a live outlet. After
you have ensured that it is not a power issue, disconnect any speakers.
If the amplifier turns on after a few seconds delay, then the problem is
in the output connection. Check wiring and speakers for short circuits.
Problem: No output on one or both channels; Power indicator is
lit.
Procedure: Check that level controls are not turned down. Check that
input and output connections are secure. Ensure signal present LED is
flashing to denote a signal. If there is no signal detected check signal
source and that level controls are set high enough.
Problem: Amplifier overheats and/or shuts off.
Procedure: Review section 2.3 on proper cooling procedures. Check
the signal lights on the rear of the amplifier to see if the signal is over-
driving (the signal light flashes red frequently). Overdriving the amplifier
for extended periods of time can cause a thermal shutdown.
Problem: Output sound is distorted or cracking.
Procedure: Check all cables for damage or loose connections and re-
duce the gain on the input signal at the mixer or preamp level. Replace
the cables and loudspeakers temporarily to see if this resolves the
problem. If problem still exists, contact your Authorized Dealer for ser-
vice.
.Problem: No RS232 communication
Procedure: Ensure that the connections are done as specified in sec-
tion 4.2.2. Check that the communication is at 9600 baud. Shorten the
cable lengths to see if it affects the communication