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raymiller avatar image
raymiller asked

Cerbo GX Digital inputs - Pulse counter not supported?

I'm updating my Venus GX to Cerbo GX so it will now support a battery BMS and VE. can bus.

The Cerbo GX manual, section 12.1 Configuration Note for Digital inputs, "Pulse Meter is not supported in Cerbo GX." then give examples of configuring to "pulse"

What does this mean? I can configure all D1-4 as "pulse", and they do seem to count (sometimes) when I earth the Digital inputs - 3.3 Volts but not all pulses are counted.

It would appear if ground pulses are occurring in under many seconds between pulses the pulse counter is not incremented? Is this the correct operation?

What is the minimum ground pulse width needed for the pulse counter to count reliability?

Why the lack of backward compatibility in the more advanced and powerful Cerbo GX?


I used the pulse counter on the Venus GX to record water meter flows and rainfall (tipping bucket) which do not work reliably now on the Cerbo GX which is the replacement for the Venus GX. Can this be fixed?

If the Cerbo GX manual could be a bit more technically specific on the accepted pulse width for the reliable operation of the pulse counter would be much appreciated.


cerbo gxVenus GX - VGX
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4 Answers
mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hi Raymiller, indeed it can not do pulse counting.

In all honesty, its an oversight early in the design; which was then accepted since its a feature thats only used very rarely.

The next update of the Cerbo GX, in stock in year orso from now, (can be longer) will have pulse counting functional again.

Matthijs

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jjbond avatar image jjbond commented ·

Wow, no update in years, several posts like this "yea we're working on it" and never an update... What is the current status on being able to integrate a well pump flow / pulse meter into the Cerbo environment? You said in a year or so it would be possible, it's been 2, status please???? Please answer the person's question about if it's a hardware or a software restriction, will we need to buy new Cerbo's to get back the function we lost by moving to Cerbo from Venus????

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raymiller avatar image
raymiller answered ·

Thanks for the explanation.

Are you meaning the current pulse counting limitation in the current Cerbo GX is hardware or software?

Why I ask the question is that the digital inputs do pulse count, but as I found out if the pulses are too short in duration say < 800ms they are all but ignored.

My solution is to add a 555 timer circuit to the one input which is the major problem to extend the pulse width to around 1 second. (yet to be implemented)

While talking about digital inputs interfacing microcontrollers; as the inputs interface the outside world and can have a range of failure modes, could some consideration be made to the programming to make it not only more fault-tolerant but diagnostic, i.e. being able to set the window of acceptable signal in logic to report out of tolerance inputs? As we know contacts bounce, short circuits happen and intermittent or variable resistance i.e. water ingress into the wiring.

Many thanks, regards from Australia

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chuff avatar image
chuff answered ·

hi, is the pulse counter now available in the cerbo GX ? Production version???

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mvader (Victron Energy) avatar image mvader (Victron Energy) ♦♦ commented ·
Hi @chuff , no, its not; sorry. I don’t know yet when that version will make production.



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jjbond avatar image
jjbond answered ·

Wow, no update in years, several posts like this "yea we're working on it" and never an update... What is the current status on being able to integrate a well pump flow / pulse meter into the Cerbo environment?

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