Pinout Exhaust Fan board

Hello,

i have the exhaust fan installed.

Now i woulf like to connect 4pin Bus devices and bought the H2 4pin interface board.

i know the pinout of the 4pin internal connector if the H2 interface board.

on the exhaust fan board is an internal 4pin connector. i think this is for internal bus connection,

does anybody know the pinout of that 4pin connector of the exhaust fan board?

i can only find ground

I would think the internal would mimic the printer side, however this will give you a start as only 2 are swapped in the 4 pin.

https://www.reddit.com/r/BambuLab/comments/1374wbd/access_24v_in_the_bambu_bus_cable_4pin/

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That pinout ist known.

I thought i can connect both board with the internal connectors.

But i cant Figuren out the pinout of the connector on the exhaust fan board

I think the best thing would be to put in a ticket to be sure. The rotary uses that port but I don’t know if the pin out is available or the same.
@SupportAssistant is this possible to help with?

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I am not sure if I understand the question correctly.

But yes, it’s best to open a ticket and ask for help. Please make sure that you include details of what you wish to achieve, so that our team can provide the best suggestions.

Thanks!

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Support wont help because it is a secret.

i just wanted to use the h2 interface board as an adapter for using my 4pin bus devices.

the h2 interface board pinout is easy (VCC, GND and SIgnal A & B) are on that internal 4pin connector. But on the ehaust board i can only find GND.