Zimo does support serial communication.
MX1 CV99 changes serial pulse timing in the command console/station. This can help for programming some decoders that drive switches.
Decoder cv112 bit 7 (add 128) is for serial communication. Needed for using decoders on old MTS systems. I have the original 55000 which has serial only and a mouse.
Use F1 on the zimo system with multiple depresses to get function, that is f1 4 times gives F4, etc.