Yes, that should work. I run my control panel through a usb->rs232 
converter. I have found the USB side to be a little sensitive to noise. 
Very occasionally it will lose connection. At that point I need to 
restart LCNC to reconnect which is a PITA. This is probably very 
specific to my setup.

By the way if you get a USB->RS485 converter, try to get one based on a 
FTDI chip. FTDI are the most stable and reliable USB->serial converters 
I have found.

Les

On 18/12/2014 11:53, 77dab wrote:
> Hi all,
> I have on my hand some mitsubishi VFD with 550w winches.
> I would like to try to move them using LinuxCNC.
> the thing is not meant to be Real time, and I've read the modbus module
> lives in User space and it's not RT.
> So, my question:
> Since it isn't RT, can I drive the rs485 thru a USB->rs485 converter,
> using a laptop?
>
> Thanks, Davide.
>


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