Vision SB-1900P El Manual Del Propietario página 15

Status Update Messages Structure:
If the verbose mode is set to 2 or 3, the soundbar will send status update messages automatically.
These messages are not a response to any particular command. Any status change caused by
commands from RS232 control, front panel buttons, IR remote control, or playback progress may
trigger status update messages.
The status update messages have the following structure:
<Update> = <Start of Update><Status Code>[<sp><Parameters>]<End of Update>
<Start of Update> = @, ASCII 0x40
<Status Code> = <byte><byte><byte>
<sp> = space, ASCII 0x20
<Parameters> = status-specific
<End of Response> = CR, ASCII 0x0d
Command Sequence:
Commands are executed in the order they are received. The control client should wait for a response
from the soundbar before sending the next command.
If the soundbar receives a new command before executing the previous command, the soundbar may
execute the commands in sequence or discard the previous command, depending on the internal
processing of the soundbar. The control client should avoid sending multiple commands in sequence
without waiting for a response.
If the host does not receive a response from the soundbar 10 seconds after the command is issued,
the host may consider the command or response lost during transmission, and can retransmit the
command.