Hi, I am having the same issue if I’m not mistaken. Rubicon is helping with guiding the manufacturers new firmware update. Issue might be here a while.
I have the correct pin out cable, and the master inverter has comma with battery bank. I’ve also made a double up cable, where I just jumped the wires coming out of the Pylontech RS485 port to both inverters. This gives random errors 60 61, saying not to charge; not to charge or discharge, and then one looses comms and then the next.
Will chat to supplier again today and find out how to properly communicate between multiple inverters and Pylontech Battery Bank