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Based on the description, there are only the differential data wires A and B connected between the two RS485 tranceivers that do not share a common reference, as one of the tranceivers includes isolation and runs on separate isolated power supply, so it completely floats in regards to the other tranceiver and the voltages float more than the common mode ...


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I designed in a 1x16 character VFD display into a product back in the early 1990s. Like this one it also came from Futaba. This was a 'bare' display with no driver chip as yours seems to be. Driving the display helps if you consider that it resembles a multi-anode thermionic valve (vacuum tube), actually a multi anode, multi grid directly heated cathode ...


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the protocol is chinese: the encoder IC is SW5104 by Swsem.com Function Description Key input terminals K1—K8 In static mode, the key input terminals K1~K8 are set to high level by the internal pull-up resistor, and in the circuit no current flows; when any key is pressed (that is, grounded), the corresponding programming will be generated. User code coding ...


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