RS232 Protocol

2
IP Control Settings
The RC-1590 will accept and respond to IP control commands if the product is connected
to a local network and has a valid IP address.
Commands will be accepted via TCP port 9590, and the unit will send responses back via
the same port. The command and response format is identical to the serial commands.
Communication Protocol
Command and response messages are included on the following pages.
Automatic display update information can be enabled/disabled using the
“display_update_auto” and “display_update_manual” commands.
In automatic mode each time the display changes the new display line(s) will be sent.
In manual mode the display updates must be requested each time a refresh of the
display information is desired. This primarily applies to Front USB metadata information.
Basic status information such as volume, power or source changes will still be provided
automatically.
Note about Rotel Link RCD feature: The input that has been selected for the ROTEL LINK
RCD option in the setup menu of the RC-1590 will affect the response string from the
unit for that input. If the input has been set as the Rotel Link RCD input, the response
string for that input will be the second string listed in the table (i.e. if COAX1 has been
set as the Rotel Link RCD input, the response string will be source=coax1_cd! rather than
the standard response string of source=coax1!).
Note about PC-USB Transport control codes: The basic transport functions
(Play/Pause/Track etc) for PC-USB will ONLY function when the RC-1590 is set for USB
2.0 mode.
Section 1: Control Command List V2.0
Applies to RC-1590 V1.40 and newer
RC-1590 ASCII
Command Description
Unit Response
POWER & VOLUME COMMANDS
power_on!
Power On
power=on$
power_off!
Power Off
power=standby$
power_toggle!
Power Toggle
power=on/standby$
vol_up!
Volume Up
volume=##$
vol_dwn!
Volume Down
volume=##$
vol_min!
Set Volume to Min
volume=00$
vol_nn!
Set Volume to level n (01 - 96)
volume=##$
mute!
Mute Toggle
mute=on/off$
mute_on!
Mute On
mute=on$
mute_off!
Mute Off
mute=off$