The USB to RS-485 adapter should have this labeled on it as well so the connections should be relatively straight forward. The VFD should have two terminals labeled RS+ and RS. Get a high quality interface to reduce any issues during the process. RS-485 is just a serial interface protocol that uses standard 0 to +5 voltage TTL signal levels for communication (as opposed to RS-232 which uses -12v and +12 for signal level changes). The LinuxCNC spindle control page is found here: Additional Information: After reading the LinuxCNC page my first questions would be can the spindle be controlled by PWM signal? Also, what pin on the parallel port would I set to Spindle Enable and FRW? Additional Information: To connect your computer to the VFD, use a USB to RS-485 interface. So, please use this FAQ (Question #: 13233) to state your questions by submitting additional information below. LinuxCNC has excellent documents however, I would like to offer our help in case you don't understand the information on that page.
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