Hi!
No problem. Its still not working so i have to use Plan B now..Will connect Mitsubishi Outlander CMUs to the battery for monitoring.

First: I know the slaves have to be connected to the battery :) I meant, that i disconnected the BMS PCBs and connected them afterwards again.

Yesterday i ...

Update: I soldered a wire to the SHDNL Pin of the BMS. Afer putting the PCB back in the battery and starting the program and a small delay the voltage rises from 0V to 9V. So the MAX17823B has turned on, as it seems.
I will dismantle the complete battery from the car in the next days and check, if ...

Hi!
The transformers should be ok..i measured 0,5 ohm on every transformer.

I got a small breaktrough. It started communicating with one slave. Serial Monitor messages in the attachment.

Error2.txt

Master receiving - SEC1.1_Sec1.3.jpg

2.Master receiving - SEC1.1_Sec1.3.jpg

Now is the ...

Yes, on my first try month ago, i forgot it. After putting the loopback to the system, it worked with two modules.
But after some weeks i tried it again and it failed.
I played a little bit with the code. Maybe i wrote some data to the master, that is now stopping it from working correct? Could ...

Yes, only one probe was used :)

With one Module connected it looked like that:

Module 1 in:

Slave1 - Rosa Orange.jpg

Module 1 Out:
Slave 1 - Gelb Weiß.jpg

After loop:
Module 1 in:
Slave 1 - Grün Braun.jpg

After that there was nothing measurable.

So no input into the transformer to ...

Hi bexander!
Thank you very much for the fast answer :)
My Oscilloscope has a bandwidth of 50 MHz.
The measurement above on the secondary was already done without reference to GND of the MAX 17841B. I will attach a new measurement :) I connected the probe to sec2_3 and the "gnd" of the probe to ...

Hi!
I was a "silent follower" since month, because we are converting a VW T2 to electric. Its nearly done - next week we want to go to the TÜV in Göttingen :)

One problem still has to be solved: The additional battery is using CATL Modules with the MAX BMS. I used the original CATL BMS Master and ...