Connecting NAD C355BEE (amplifier) via RS232

@Aram wrote:

Hi,

I am running Hassio HA 0.103.6 on Raspberry Pi 3.
Trying to connect NAD C355 via RS232 to USB adapter.
Followed the guide from: https://www.home-assistant.io/integrations/nad/
And tried all these options for a device:

• /dev/ttyUSB0
• /dev/serial/by-id/usb-Prolific_Technology_Inc._USB-Serial_Controller-if00-port0
• /dev/ttyAMA0

In the logs I see that the adapter is connected:

• usb 1-1.4: pl2303 converter now attached to ttyUSB0

However when I restart the server after saving the configuration I get in the logs the following:

nad: Error on device update!
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 292, in _async_add_entity
    await entity.async_device_update(warning=False)
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 461, in async_device_update
    await self.hass.async_add_executor_job(self.update)
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/homeassistant/homeassistant/components/nad/media_player.py", line 190, in update
    if self._nad_receiver.main_power("?") == "Off":
  File "/usr/local/lib/python3.7/site-packages/nad_receiver/__init__.py", line 75, in main_power
    return self.exec_command('main', 'power', operator, value)
  File "/usr/local/lib/python3.7/site-packages/nad_receiver/__init__.py", line 55, in exec_command
    self.ser.write(''.join(['\r', cmd, '\r']).encode('utf-8'))
  File "/usr/local/lib/python3.7/site-packages/serial/serialposix.py", line 521, in write
    raise writeTimeoutError
serial.serialutil.SerialTimeoutException: Write timeout

Just in case I also connected the RS232/USB converter to my Mac and successfully controlled the amplifier via “console” and sending the commands from NAD documentation C355_RS232_Protocol.zip .

Is there any other option to investigate?

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