AVR 325/525/7200: RS-232 Port Instructions
Version 1.1 - Revised 6-Jan-2003
Page 4 of 5
The commands being sent through the RS-232 link are direct mirror images of the
commands and command sequences that would be used if you were pressing the
remote control buttons for the specific product. In cases where a main command is
issued first, followed by up/down or left/right navigation to select a choice, you will need
to use the specific directional commands for the command in use. The up/down and
left/right navigation commands are NOT universal for the RS-232 link; it is critical that
you use the correct navigation command control.
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To construct command set sequences for RS-232 control you will want to create a
structure that duplicates the buttons that you would push on the remote control to issue
the desired command. To do that efficiently, it is always a good idea to familiarize
yourself with the product’s owner’s manual and method of operation. To avoid problems
that might occur when using a controller other than the unit’s own remote, we do not
recommend using the RS-232 commands with the OSD menus. Instead, it is easier to
use the direct command sequences available for most major AVR options. The use of
the direct commands increases the accuracy of the transmission, as the system will not
need to “guess” the position of the cursor within a menu structure.
Remember that some commands require multiple “button presses”, regardless of
whether the command is being sent live from the remote, or via the RS-232 link. Be
certain that you include all needed commands, and that the spacing between each
command is at least 108ms.
Also remember that the command structure when using the RS-232 link does not
accommodate “repeat” commands. These must be issued by duplicating the command
as many times as needed, or by instructing the user to tap and release the button on the
device connected to the RS-232 system, rather than pressing and holding it.
In constructing commands for Surround Select, Multi-room, Speaker Configuration,
Digital Input and Delay, please note that the direct access setup controls for those
options require that you first send the code that accesses that control sequence, just as
you would press the individual button on the remote to enter that command. To adjust
the setting or scroll through the menus you must then issue the specific “UP” or
“DOWN” commands that are associated with the item being controlled. Note that each
of these commands has their own set of these “shift” codes, and they are not
interchangeable. For example, the “UP” command used to change surround modes is
different than the “UP” command used to trim the channel levels.
When changing the surround mode using the Dolby, DTS Surround, DTS Neo:6, Logic
7 or Stereo buttons/commands, note that the first press of the button selects the mode,
and the command needs to be issued again to scroll through the available mode
choices.
