Re: [CAD_CAM_EDM_DRO] PC serial port to VFD speed control ??

Andrew Mawson wrote:

>Hi,
>
>I'm looking to control the spindle speed of my mill conversion
>(running TurboCNC under DOS) by talking to the VFD via the serial
>port. (Turbo CNC has a placeholder for customising the spindle speed
>command)
>
>Most VFD's seem to be 'RS485' communications and not the 'RS232' your
>average PC is equipped with.
>
>Is there an easy / cheap way to convert from one to the other bi-
>directionally ?
>
>

Yes, you should be able to buy such a device. Look in the equivalent of
"Black Box",
or some other computer and networking accessories catalog. It shoul;d
be a pretty
simple device, just 2 signal translator chips.

Jon