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.
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 >
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