If you mean position control, then the answer is no. With emc, usb or
serial are not suitable for realtime motion control. For some more
information on why this is,
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Emc2HardwareDesign
If you mean auxiliary I/O then the answer is yes. A userspace HAL
component can talk to devices where real-time I/O isn't required.
Depending on the system, this could be used for things like spindle
control, rotating the tool carousel, and possibly other tasks. There
are some examples of this on our wiki.
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?ContributedComponents#Hardware_Drivers
Jeff
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