Hey Atroz, hey David @RedTonto, hey all,
here’s the RS-485 interface / Modbus doc at buildbotics.
While RS-485 can do full-duplex over four wires, the RS-485 interface at buildbotics uses only two wires.
You are right, RS-232 is not compatible out of the box with RS-485.
- RS-485 – a descendant of RS-422 that can be used as a bus in multidrop configurations
- RS-422 – a high-speed system similar to RS-232 but with differential signaling
Anyway, there are RS-232 to RS-485 converters available.
Why can’t people simpy buy serious VFDs? It’s the VFD that gets your best efficiency and performance out of your spindle, not the spindle itself. I would never save on that. People think they can get the constant torque over the wide speed range with this crap. Huanyangs HY Series and also the VFD presented here, obviously no Huanyang but a Isacon ASKPOWER A131, don’t even have Sensorless Vector Control, only stupid U/f control.