RTL515 radar is disconnecting from head unit when light is turned off

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10 September 2020 10:16 AM

Ros Newbie

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Joined 2019-05-06

When I pair both RTL515 radar and lights with the head unit and then switch off lights by short pressing onboard button (onboard LED is still blinking) the head unit loose connection with radar although lights can be still controlled. Is this expected?
The same test as above done with Garmin head unit and RTL510 has different behavior - radar stays connected if
short pressing the button.

Additionally the same behavior is observed if lights are turned off by sending ANT light page34 request to set the mode to OFF. At head unit I can observe that EVENT_RX_FAIL_GO_TO_SEARCH event has triggered which make me think that radar has terminated the link connection with head unit once it receive a command to switch off the lights.

[ Edited: 11 September 2020 04:27 AM by Ros ]

14 September 2020 11:54 AM #1

haighi Administrator

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Is your display device forming a network with the light, or just controlling it as a simple controller through the broadcast channel? The radar should stay on in the button press case if the light is maintained as part of a network with the light in the off mode, but will turn off if there is no light network because there is no continuing indication that it should remain on. This is part of the logic to ensure the battery doesn't drain when the light/radar are not in use after the user turns the light off.

Part of the radar profile is the ability to abort a shutdown. This should allow your display to prevent the radar channel from closing in the case where the light is not part of a network, and is turned off by a light controller. Please let me know if this works for you.

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Ian Haigh

15 September 2020 05:07 AM #2

Ros Newbie

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Correct, our display controls RTL directly via broadcast channel rather than forming a light network. We would like to continue using this approach for now.
Can you please provide details on how to update radar profile to avoid disconnects when light is turned off?

15 September 2020 08:44 AM #3

haighi Administrator

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See section 4.2.1 of the radar profile document.

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Ian Haigh

15 September 2020 09:48 AM #4

Ros Newbie

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I do check this section and basically it describes the case when there is single radar and two displays. Although in my case there is one radar and one display.
Anyway I was monitoring page1 in order to see device state set to 1 (i.e. Shutdown). However if I turn off light using a button or sending light off ANT message - radar page1 always provide 0 (i.e. Aborting Shutdown).
According to 4.2.1, when other display request a shutdown, radar must send page1 with Shutdown set, but this does not happen in my use case...
Any thoughts?

28 September 2020 02:30 AM #5

Ros Newbie

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Ian, can you please provide your thoughts for my last response?

29 September 2020 10:44 AM #6

haighi Administrator

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I tested an RTL 515. What I see is that the device doesn't report that the radar channel is closing as per section 4.2.1 of the radar profile, it just closes the channel.

The Garmin team have told me this is an intentional design decision.

The only way to have radar stay on while the light is turned off is by having the light remain a part of a light network.

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Ian Haigh

30 September 2020 01:20 AM #7

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Ok, thanks for looking into this Ian

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