question

stefann asked Dec 23, '19

Venus GX command relay

Hi,

Running the latest version OS.

Closing the relays works OK, but opening them not working. Result in terminal shows 0 after all commands.

dbus -y com.victronenergy.system /Relay/0/State SetValue 1

dbus -y com.victronenergy.system /Relay/1/State SetValue 1

The above works ok.

dbus -y com.victronenergy.system /Relay/0/State SetValue 0

dbus -y com.victronenergy.system /Relay/1/State SetValue 0

Does NOT work.

Please advise!

Thx,

2 |3000

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splash answered · Dec 28, 2019 at 08:34 PM

Hi Stefann,

I had the same issue, After some digging around my solution was to use dbus-send.

dbus-send --system --print-reply --dest=com.victronenergy.system /Relay/0/State com.victronenergy.BusItem.SetValue variant:int32:1

OFF

dbus-send --system --print-reply --dest=com.victronenergy.system /Relay/0/State com.victronenergy.BusItem.SetValue variant:int32:0

GetValue

dbus-send --system --print-reply --dest=com.victronenergy.system /Relay/0/State com.victronenergy.BusItem.GetValue

Returns:

method return time=1577563971.665778 sender=:1.33 -> destination=:1.912 serial=19248 reply_serial=2

variant int32 1

If you want the command to only return the value of the switch use:

dbus-send --system --print-reply --dest=com.victronenergy.system /Relay/0/State com.victronenergy.BusItem.GetValue | awk -F'int32 ' '{printf "%s",$2}END{print '\n'}'

Returns:

dbus-send is far faster for issuing commands and returning values.

Kind Regards

Paul

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Ingo answered · Jan 08, 2020 at 01:30 PM

@mvader (Victron Energy Staff) suggested using %0 and %1 to force the values written to be INT. It seems to work perfectly on both VenusGX and RaspberryPi.

dbus -y com.victronenergy.system /Relay/0/State SetValue %0

dbus -y com.victronenergy.system /Relay/0/State SetValue %1

*Hopefully it's the right mvader from the Venus DEV list... :-)

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Ingo commented · Jan 09, 2020 at 03:46 PM

Ok, so I fixed the relaystate.py file by removing the BOOL conversion. I don't know if it broke anything else but both VenusGX and RaspberyPi works now as it should. Maybe someone from Victron can just doublecheck it and work it into their next fixes.

def _on_relay_state_changed(self, dbus_path, value):
		try:
			state = int(bool(value)) <- This one here!!!
		except ValueError:
			traceback.print_exc()
			return False
		try:
			return self.__on_relay_state_changed(dbus_path, state)
		finally:
			# Remember the state to restore after a restart
			self._settings[dbus_path] = state

0 ·

rainerb answered · Dec 24, 2019 at 07:49 AM

Hello Stefann,

I hope I understand your issure right, but the result "0" in the terminal only indicates a successful dbus command. Did you check the relay switching with a measuring device?

If you want to read out the state of the relay, you may use the ".../State GetValue" command.

Regards

Rainer

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stefann answered · Dec 25, 2019 at 11:27 AM

Hi Reiner, Happy Holidays

Thx for the reply.

Never placed a MultiMeter on the physical relays. I can energize / de-energize the relays ok from Rem Console.

Maybe other suggestion would help me.

Do you know where the script is for Rem Console - relay trigger page? I want to see how is done from the html page. Maybe name of the qml file.

Want to control the 2 relays from a bash + cron: 1st to ON/OFF a Fan evac; 2nd to ON/OFF an ATS.

I am placing a copy of the terminal bellow - exec and response sequence.

root@Venus:~# dbus -y com.victronenergy.system /Relay/1/State GetValue
0
root@Venus:~# dbus -y com.victronenergy.system /Relay/1/State SetValue 1
0
root@Venus:~# dbus -y com.victronenergy.system /Relay/1/State GetValue
1
root@Venus:~# dbus -y com.victronenergy.system /Relay/1/State SetValue 0
0
root@Venus:~# dbus -y com.victronenergy.system /Relay/1/State GetValue
1

Thx,

2 |3000

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Ingo commented · Dec 26, 2019 at 07:18 AM

I can confirm your results. Relay 2 can be Switched On but never Off via the command-line. From the GUI it works perfectly, even the State updates correctly on the Remote Console. Using Modbus it also works for both On and Off states.

It has to be a bug, I suspect the code was introduced to enable Relay 2 but the commandline utility might not have been finished - or I could be totally wrong :-)

Edit: Running 2.42

0 ·

rainerb Ingo commented · Dec 27, 2019 at 07:57 AM

Hi,

could anyone of the Victron Energy Staff perform a short test (and eventually confirm) that there could be a bug in newer GX versions regarding switching off the relays via dbus commands - maybe Daniël Boekel (Victron Energy Staff) ?

With my v2.31 it works, according others, in v2.42 it does not work anymore.

Thanks.

Rainer

0 ·

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rainerb commented · Dec 26, 2019 at 08:06 AM

Hi,

I am using Relay 2 in my bash script to switch my Fronius inverter to standby and it works.

I am running Venus version v2.31 - maybe they implemented a bug in newer versions.

I testet it and I can switch the relay On AND OFF via dbus commands.