question

ian0 avatar image
ian0 asked

VE Bus interfacing

I’m looking at the document “Interfacing with VE.Bus products – MK2 Protocol” and would like to get the operating parameters (charger mode, voltages etc).

I looked at various pins of the RJ45 connector on the scope, and it appears that the interface is RS485, at a baud rate MUCH higher than the 2400 baud specified in the document.

What is the correct spec for the baud rate?

VE.Bus
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3 Answers
Thiemo van Engelen (Victron Energy staff) avatar image
Thiemo van Engelen (Victron Energy staff) answered ·

Hi @Ian0

The protocol described in that document is not the protocol on the VE.Bus itself, but the protocol on the serial interface of the MK2/MK3. You should never directly communicate on the VE.bus, but always through a MK2/MK3.

Kind regards,

Thiemo van Engelen

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ian0 avatar image
ian0 answered ·

Thanks. The term “Mk.3” eluded me. Mk.3 what?
Mk.3 interface module!

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Thiemo van Engelen (Victron Energy staff) avatar image Thiemo van Engelen (Victron Energy staff) ♦ commented ·

Hi @Ian0

Indeed this: https://www.victronenergy.nl/accessories/interface-mk3-usb

Regards,

Thiemo van Engelen

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ian0 avatar image ian0 Thiemo van Engelen (Victron Energy staff) ♦ commented ·
Is the RS232 version still available? it is on the price list, but only the USB seems to be on the website.
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Thiemo van Engelen (Victron Energy staff) avatar image Thiemo van Engelen (Victron Energy staff) ♦ ian0 commented ·

Hi @Ian0

It is still available. When you look online for the part number ASS030120210 you should be able to find a shop that sells them.

Kind regards,

Thiemo van Engelen

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ian0 avatar image ian0 Thiemo van Engelen (Victron Energy staff) ♦ commented ·
Is there a manual available for download?

I need to know if it is DTE or DCE for the pin out, and whether it is real RS232 levels or TTL levels.

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ian0 avatar image
ian0 answered ·

Is the battery temperature available via the interface?

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Thiemo van Engelen (Victron Energy staff) avatar image Thiemo van Engelen (Victron Energy staff) ♦ commented ·
Hi @Ian0

I have no idea. When it is, this should be in the documentation.

Kind regards,

Thiemo van Engelen

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Related Resources

What is VE.Bus?