rsp1570serial-pp81381 0.1.8

Rotel RSP-1570 processor asyncio RS-232 protocol

rsp1570serial

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 and on Raspbian Stretch

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.

Usage

Create a connnection

The connection objects encapsulate most of the functionality of the library.

It is recommended that the SharedRotelAmpConn is used in preference to the basic RotelAmpConn. Either way, use the context manager factory methods to create a connection. E.g.:

    from rsp1570serial.connection import create_shared_rotel_amp_conn
    from rsp1570serial.utils import get_platform_serial_port

    async def do_something(serial_port=None):
        if serial_port is None:
            serial_port = get_platform_serial_port()

        async with create_shared_rotel_amp_conn(serial_port) as shared_conn:
            conn = shared_conn.new_client_conn()
            # 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://192.168.0.100:50000 (if you are using a TCP/IP to serial converter)

An exception of type RotelAmpConnConnectionError is thrown if a connection cannot be made to the specified device.

send_command(command_code)

Send a command (see commands.py for the full list):

    await conn.send_command('MUTE_TOGGLE')

send_volume_direct_command(zone, volume)

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_messages()

Read the input stream from the device:

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

conn.process_command(command_code, time_window=DEFAULT_TIME_WINDOW)

Send a command and then collect all messages that arrive in time_window. Class constants are provided with recommended time windows. Note that the 'POWER_ON' command needs a longer time window than other commands.

    async with create_test_shared_conn() as shared_conn:
        conn = shared_conn.new_client_conn()
        messages = await conn.process_command('POWER_ON', conn.POWER_ON_TIME_WINDOW)

This command can be handy for scripting-like automations. See discovery.py for an example.

Messages

The conn.read_messages() and conn.process_command() methods 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.

Source Aliases

The user of a Rotel Amplifier can customise the name shown on the display for each source. These 'aliases' are the names that will be found in the source_name field of the FeedbackMessage rather than the official source names. For example, a user might configure the name of the 'VIDEO 1' source to be 'CATV'. In this instance, the client software would need to know to send the 'SOURCE_VIDEO_1' command_code in order to select the source that the user knows as 'CATV'.

discover_source_aliases(serial_port)

This is a utility function that can be used by Home Automation software to discover the aliases for all of the sources. It returns a dictionary that maps each source alias to the command_code needed to switch to that source. The discovery process is not quick so it is recommended to use this utility in the initial device configuration rather than each time the Home Automation software is started.

        source_map = await discover_source_aliases(serial_port)
        self.assertDictEqual(source_map, {
            'CATV': 'SOURCE_VIDEO_1', 'NMT': 'SOURCE_VIDEO_2',
            'APPLE TV': 'SOURCE_VIDEO_3', 'FIRE TV': 'SOURCE_VIDEO_4',
            'BLU RAY': 'SOURCE_VIDEO_5', 'TUNER': 'SOURCE_TUNER',
            'TAPE': 'SOURCE_TAPE', 'MULTI': 'SOURCE_MULTI_INPUT',
            ' CD': 'SOURCE_CD'})

Examples

Please see example1.py and example2.py and the test suite for fully working examples.

Objects

RotelAmpConn

The RotelAmpConn object is the basic connection object. It can be used to establish a single, dedicated connection to the device, send commands and read responses. Consider using SharedRotelAmpConn in preference to this lower level object.

Use the create_rotel_amp_conn context manager as a factory:

    from rsp1570serial.connection import create_rotel_amp_conn
    from rsp1570serial.utils import get_platform_serial_port

    async def do_something(serial_port=None):
        if serial_port is None:
            serial_port = get_platform_serial_port()

        async with create_rotel_amp_conn(serial_port) as conn:
            # Do something here

Method	Description
create_rotel_amp_conn(serial_port)	Context manager to create and open a connection
conn.send_command(command_code)	Send a command (see commands.py for the full list)
conn.send_volume_direct_command(zone, volume)	Set the absolute volume in a zone
conn.read_messages()	Iterator that reads the messages from the device. See read_messages for more information.

SharedRotelAmpConn

Wraps a RotelAmpConn object and allows it to be shared.

Use the create_shared_rotel_amp_conn context manager as a factory:

    import asyncio
    from rsp1570serial.connection import create_shared_rotel_amp_conn
    from rsp1570serial.utils import get_platform_serial_port

    async def do_something(serial_port=None):
        if serial_port is None:
            serial_port = get_platform_serial_port()

        async with create_shared_rotel_amp_conn(serial_port) as shared_conn:
            logger_conn = shared_conn.new_client_conn()
            logger_task = asyncio.create_task(do_something_else(logger_conn))
            cmd_conn = shared_conn.new_client_conn()
            await cmd_conn.process_command('POWER_ON', conn.POWER_ON_TIME_WINDOW)
            await cmd_conn.process_command('SOURCE_VIDEO_1')
            await cmd_conn.process_command('VOLUME_UP')
            await logger_task

    async def log_all_messages(conn):
        async for message in conn.read_messages():
            message.log()
        

Method	Description
create_shared_rotel_amp_conn(serial_port)	Context manager to create and open a shared connection
shared_conn.new_client_conn()	Create a new client connection of type SharedRotelAmpClientConn

SharedRotelAmpClientConn

A client connection. Supports sending commands and receiving messages. Also supports a mechanism to send a command and collect all of the messages received in a time window, which can be useful for script-like automation of the amplifier.

If the client code is not consuming messages from the connection then they will be queued up internally until one of the message consuming methods is called. Two client connections of the same shared connection are completely independent and can be read at different speeds without back pressure.

When finished with the object, simply dereference it and it will be garbage collected.

Method	Description
conn.send_command(command_code)	Send a command (see commands.py for the full list)
conn.send_volume_direct_command(zone, volume)	Set the absolute volume in a zone
conn.read_messages()	Iterator that reads the messages from the device. See read_messages for more information.
conn.collect_messages()	Collect all internally queued messages (emptying the queue)
conn.process_command(command_code, time_window=DEFAULT_TIME_WINDOW)	Send a command and then collect all messages that arrive in time_window. See constants below for recommended time windows.

Constant	Description
conn.POWER_ON_TIME_WINDOW	Recommended time_window to be used after a 'POWER_ON' command
conn.DEFAULT_TIME_WINDOW	Recommended time_window to be used after most commands

FeedbackMessage

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 >

TriggerMessage

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']],
]

Emulator

The package also includes an RSP-1570 emulator that can be used for demonstration or testing purposes. It can also be used in Home Assistant with the rotel_rsp1570 media player platform.

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