On Wed, 2017-02-15 at 12:45 -0600, dragon wrote: > The 20ma control circuit on the VFD is an analog control, where as the > parallel port pin is a digital (on/off) signal. You will need some sort > of hardware interface between the two to do a digital to analog conversion.
is there a list of supported hardware, that I could buy on ebay ? I was looking at http://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNC_Supported_Hardware I have already 3 stepper drivers mounted in a metal box with their power supply, I would need only a small interface for the spindle > > > On 02/15/2017 12:36 PM, Valerio Bellizzomi wrote: > > On Wed, 2017-02-15 at 10:22 -0800, Kirk Wallace wrote: > >> On 02/15/2017 09:25 AM, Valerio Bellizzomi wrote: > >>> Hello, > >>> > >>> I have an Toshiba vfd which has a current signal input (max 20mA), is > >>> that compatible with linuxcnc to be wired to S gcode command ? > >>> > >>> > >>> Thanks. > >> > >> Briefly, mostly yes. > >> > >> The S word has an associated HALpin. This HALpin can be HAL connected to > >> another HALpin that handles the hardware that can affect your VFD speed > >> function. So: > >> > >>> S word --> S word HALpin --> 20ma HALpin/20ma HALcomponent -- 20ma > >>> hardware > >>> ^^ g-code/MDI -- .hal configuration file -- HAL .comp component file -- > >>> wire from hardware interface to VFD > >> > >> In other words, LinuxCNC already has a S word HALpin that you can use to > >> connect your 20ma interface to. You would need to decide what hardware > >> you want to use and look for or make the HAL component (software). > >> > > > > > > I am not aware of any interface hardware , I thought to wire one > > parallel pin to the vfd, but I might be wrong. > > > > suggestions? > > > > > > > > > > ------------------------------------------------------------------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
