BMS problem - BQ79616 not responding to read commands

[Dias52]

Hi,

I am currently designing a modular BMS with a master-slave topology. The master PCB has a microcontroller and a BQ79600 and the slave PCB has two BQ79616s to monitor and balance 22 series of cells. The PCBs are connected via the daisy chain pins of the BQs.

However, I have successfully communicated with the slave before, now I can only wake the slaves and then communication fails when I send a read command. I can communicate with the TI BQ79616 evaluation module (EVM) using my master board and the same software.

In the attachment there are two photos with the COMMH+ and COMMH- of the slave board and the EVM, the voltage in my slave board is slightly lower, is this difference relevant for it not to work?

Also attached is the schematic of the slave board, which is based on the schematic of the evaluation board.

Does anyone know where the problem might be coming from?

Best regards.