On Sun, 2009-04-12 at 21:40 -0400, Cal Grandy wrote: > Can anyone direct me to information about reading and display quad. > encoder output? Several hours searching wiki etc. and I am less than > enlightened. > > DataTorque SM15 encoders. > > TIA > > Cal in VT
If you are using a PC parallel port for your encoder, this should get you started: http://www.linuxcnc.org/docview/html//man/man9/encoder.9.html or it might give you some insight as to how other input options may work. I looked at the datasheet for your encoder: http://www.cmccontrols.com/downloads/incremental_encoders/sm15.pdf http://www.cmccontrols.com/incremental_encoder_sm15.asp Page two shows what the quadrature signals look like. Normally you would deal with what is shown as A, B and Z in the Output Signals chart or shown in the "Cable Color Code: Standard". You will need to assign parallel port pins to the HAL encoder "pins" described in the man(ual) document above. Then wire the encoder A, B and Z to the corresponding parallel port pins. If you want to use the "Cable Color Code: Differential Line Driver" option, you will need to to convert the A, A/, B, B/, Z and Z/ to A, B and Z at the parallel port end with something like: http://focus.ti.com/lit/ds/slls111b/slls111b.pdf The HAL encoder module will decode and pass the count information to its output "pins", which are usually connected to the axis and pid modules(?). A sample configuration is here: http://cvs.linuxcnc.org/lxr/source/configs/etch-servo/etch.hal -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
