3x different analog outputs in gcode?

Hello.
7i77d and other analog cards allow for multiple analog outputs, which can be used to interface with servomotors or simply to control a potentiometer type of device (VFD spindle speed, or others).

My intention is to control XYZ with Step/DIR from some typical board, and have 7i77D or other analog card output 3 different signals to regulate a few devices.

The GCode for regulating spindle speed would be "S1000". How could i regulate "multiple" spindle speeds if this is my intention, through gcode?

Are there any publicly available libraries for me to read to get more in-depth information on this?

Thank you!
 

You could either use the analog out motion feature (and gcodes M67,M68):

man motion

or multiple spindles. Recent versions of LinuxCNC support multiple spindles:

www.linuxcnc.org/docs/html/gcode/m-code.html#mcode:m3-m4-m5

 

Thank you Peter, this is all I need.
See ya!