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Rotel RSP-1570 processor asyncio RS-232 protocol

Project description


An asyncio based package to talk to a Rotel RSP-1570 processor using the RS-232 protocol

See this document for the protocol definition

Known to work with a GANA USB to RS-232 DB9 cable on Windows 10 (Python 3.7.0) and on Rapbian Stretch (Python 3.5.3)

The protocol is similar to that used by other older Rotel kit. For example, it looks as though the RSP-1572 used a protocol like this. It has a different device id and supports a few more messages but this package could probably be updated to support it.

This library was built to support a rotel_rsp1570 media player platform entity for Home Assistant that can be found here.


The RotelAmpConn object encapsulates all of the functionality of the library:

    from rsp1570serial.connection import RotelAmpConn

        conn = RotelAmpConn(serial_port)
        logging.error("Could not open connection", exc_info=True)
        # Do something here

The serial_port parameter can be anything that can be passed to serial.serial_for_url(). E.g.

  • /dev/ttyUSB0 (Linux)
  • COM3 (Windows)
  • socket:// (if you are using a TCP/IP to serial converter)

Send a command (see for the full list):

    await conn.send_command('MUTE_TOGGLE')

Send a volume direct command to a zone:

    from rsp1570serial.commands import MIN_VOLUME, MAX_VOLUME

    zone = 1
    await conn.send_volume_direct_command(zone, MAX_VOLUME)
    await asyncio.sleep(1)
    await conn.send_volume_direct_command(zone, MIN_VOLUME)
    await asyncio.sleep(1)
    await conn.send_volume_direct_command(zone, 50)

Read the input stream from the device:

    async for message in conn.read_messages():
        if (isinstance(message, (FeedbackMessage, TriggerMessage))):
            logging.warning("Unknown message type encountered")

Please see and for fully working examples.

The conn.read_messages() will return a message-type specific object containing the message data. Two types of message can be encountered:

  • FeedbackMessage: Reflects what is shown on the front-panel display. Received when the display changes.
  • TriggerMessage: Received whenever the 12V triggers change state.


This message reflects what is shown on the display of the device and will be recieved whenever the display changes. This would typically be after an RS-232 or InfraRed command has been received or after a front panel button has been pressed.

The object has 3 properties:

Property Type Description
msg.lines two element list The two lines of the display
msg.flags bytes Flags representing the state of the icons on the display
msg.icons dict of str:bool A dictionary keyed on icon code reflecting the on/off state of each icon

Methods of interest are:

Method Description
msg.icons_that_are_on() Returns a list of the icon codes of any display icons that are on. Primarily used for testing and debugging.
msg.parse_display_lines() Parse the display lines and return as much as we can infer about the state of the amp in a dict.

The following table shows the contents of the dict returned by the parse_display_lines() method.

Key Description
is_on On flag (bool)
source_name Source Name (max. 8 characters)
volume Volume (int)
mute_on Mute On Flag (bool),
party_mode_on Party Mode Flag (bool)
info Display Line 2

The following table shows all of the icon codes.

Code Name Category Friendly Name
A rsp1570_input_analog input_icons Analog
5 rsp1570_input_5 input_icons Input 5
4 rsp1570_input_4 input_icons Input 4
3 rsp1570_input_3 input_icons Input 3
2 rsp1570_input_2 input_icons Input 2
1 rsp1570_input_1 input_icons Input 1
Coaxial rsp1570_input_coaxial input_icons Coaxial
Optical rsp1570_input_optical input_icons Optical
HDMI rsp1570_input_hdmi input_icons HDMI
Pro Logic rsp1570_sound_mode_pro_logic sound_mode_icons Pro Logic
II rsp1570_sound_mode_ii sound_mode_icons II
x rsp1570_sound_mode_x sound_mode_icons x
Dolby Digital rsp1570_sound_mode_dolby_digital sound_mode_icons Dolby Digital
EX rsp1570_sound_mode_ex sound_mode_icons EX
dts rsp1570_sound_mode_dts sound_mode_icons dts
ES rsp1570_sound_mode_es sound_mode_icons ES
7.1 rsp1570_sound_mode_71 sound_mode_icons 7.1
5.1 rsp1570_sound_mode_51 sound_mode_icons 5.1
Display Mode0 rsp1570_state_display_mode0 state_icons Display Mode 0
Display Mode1 rsp1570_state_display_mode1 state_icons Display Mode 1
Standby LED rsp1570_state_standby_led state_icons Standby LED
Zone 2 rsp1570_state_zone2 state_icons Zone 2
Zone 3 rsp1570_state_zone3 state_icons Zone 3
Zone 4 rsp1570_state_zone4 state_icons Zone 4
Zone rsp1570_state_zone state_icons Zone
FR rsp1570_speaker_front_right speaker_icons Front Right
C rsp1570_speaker_center speaker_icons Center
FL rsp1570_speaker_front_left speaker_icons Front Left
SW rsp1570_speaker_subwoofer speaker_icons Subwoofer
SR rsp1570_speaker_surround_right speaker_icons Surround Right
SL rsp1570_speaker_surround_left speaker_icons Surround Left
CBL rsp1570_speaker_center_back_left speaker_icons Center Back Left
CBR rsp1570_speaker_center_back_right speaker_icons Center Back Right
SB rsp1570_speaker_center_back speaker_icons Center Back
< rsp1570_misc_lt misc_icons Misc <
> rsp1570_misc_gt misc_icons Misc >


This object has one property called flags of type bytes that reflects the state of the 12V triggers by zone.

The method flags_to_list() returns a list of the following form:

    ['All', ['on', 'off', 'off', 'off', 'off', 'off']],
    ['Main', ['on', 'off', 'off', 'off', 'off', 'off']],
    ['Zone 2', ['off', 'off', 'off', 'off', 'off', 'off']],
    ['Zone 3', ['off', 'off', 'off', 'off', 'off', 'off']],
    ['Zone 4', ['off', 'off', 'off', 'off', 'off', 'off']],


The package also includes an RSP-1570 emulator that can be used for demonstration or testing purposes.

Examples of usage:

# Start the emulator on port 50000
python3 -m rsp1570serial.emulator

# Start the emulator on port 50002
python3 -m rsp1570serial.emulator -p 50002

# Start the emulator on port 50002 and provide aliases for some of the sources
python3 -m rsp1570serial.emulator -p 50002 --alias_video_1  CATV --alias_video_2 NMT --alias_video_3 "APPLE TV" --alias_video_4 "FIRE TV" --alias_video_5 "BLU RAY"

# Start the emulator in the on state
python3 -m rsp1570serial.emulator --is_on

Full list of options:

Option Description
-p <num> or --port <num> Port number
-o or --is_on If set then the emulator will be turned on initially
--cd <str> or --alias_cd <str> Alias for the CD source
--tape <str> or --alias_tape <str> Alias for the TAPE source
--tuner <str> or --alias_tuner <str> Alias for the TUNER source
--video_1 <str> or --alias_video_1 <str> Alias for the VIDEO 1 source
--video_2 <str> or --alias_video_2 <str> Alias for the VIDEO 2 source
--video_3 <str> or --alias_video_3 <str> Alias for the VIDEO 3 source
--video_4 <str> or --alias_video_4 <str> Alias for the VIDEO 4 source
--video_5 <str> or --alias_video_5 <str> Alias for the VIDEO 5 source
--multi <str> or --alias_multi <str> Alias for the MULTI source

The emulator can be used in Home Assistant with the rotel_rsp1570 media player platform. Example configuration:

- platform: rotel_rsp1570
  name: "Rotel RSP-1570 emulator"
  device: socket://
    VIDEO 2: NMT

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