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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?
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
Thanks. The term “Mk.3” eluded me. Mk.3 what?
Mk.3 interface module!
Hi @Ian0
Indeed this: https://www.victronenergy.nl/accessories/interface-mk3-usb
Regards,
Thiemo van Engelen
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
I need to know if it is DTE or DCE for the pin out, and whether it is real RS232 levels or TTL levels.
There is no manual as this product was never released to be used in this fashion, but for use with our VEConfigure software. So the amount of support we will provide will also be limited.
That said, the pinout is:
pin 2 -> From MK2
pin 3 -> To MK2
pin 4 -> DTR
pin 5 -> GND
It works with RS232 levels, it might work with TTL levels. The level of pin 2 is determined by the level on pin 4 as that is providing the power/voltage that is used on pin 2.
Kind regards,
Thiemo van Engelen
Is the battery temperature available via the interface?
I have no idea. When it is, this should be in the documentation.
Kind regards,
Thiemo van Engelen
