RS232 Protocol

2
Channel Specific Commands
Many commands can include an optional prefix (0A:, 0B:, 0C:, 0D:) to issue a
command or request status for a specific channel. If no prefix is included the command
or status will apply to all channels.
Unit Responses in the command table including prefix 0A: indicate channel-specific
responses. Depending on the command, the unit may return additional lines of
feedback for each channel, separated by a carriage return (0A = Channel A, 0B =
Channel B, etc.).
Example Command (Specific Channel): 0C:get_channel_status!
Example Response: 0C:ch_power=on!
Example Command (All Channels): get_channel_status!
Example Response: 0A:ch_power=on!
0B:ch_power=on!
0C:ch_power=on!
0D:ch_power=on!
Channel Specific Commands:
Channel On/Off
Volume Levels
Balance Levels
Mute Settings
Channel Status
Enabling Volume Control
In order for RS232 volume control commands to function, all 4 front panel level
trims must be set to minimum. If any of the front panel volume trims are not in the
minimum position, RS232 volume control commands will not have any effect on the unit.
Balance vs. Left/Right Volume Levels
With Main Software V1.31 the RKB series amplifiers added commands for
Balance, as well as independent Left/Right channel volume settings. If individual L/R
volume settings are used, balance control commands will not have any effect and any
existing balance settings will be reset to 0 for the channel.
Power On vs. Channel On Commands
With Main Software V1.31 the RKB series amplifiers added individual channel
on/off commands. These commands can be used to enable/disable individual channels
on the amplifier rather than powering on/off the entire unit. It is recommended to use
EITHER power_on/power_off or the individual channel power commands, but not both.
For example, if amplifier channels are disabled using the channel_off commands, they
will not respond to a power_on command and must be enabled using the channel_on
command.