OpenIMU300RI termination resistance

wonder wether the OpenIMU300RI does have a termination resistance integrated, which can be enabled and disabled via the RS232 port, like the MTLT305D/M does?

Yes, OpenIMU300RI does have termination resistance. But not thru via RS232 port.
You can change in source code, Download Any application Source code in Visual Code, then Go to UserConfiguration.c file, then change .canTermResistorEnabled = 1
Then upload it to unit.

yes, the packetrate can be adjusted and saved in source code.
but ecuAddress seems can not changed to 0x83, 0x85,...., maybe you can try and test to confirm it is a problem