FPGA boards like those from Mesa (7I43 etc) will remove the parallel port as a limiting factor on speed, but the resolution is dependent on the encoder sensor and magnet. If you want better resolution, you would need to switch to the AS5311, which gives you 512 counts per mm. I use that part with the 7I43 for my linear motors.
-- Ralph ________________________________________ From: [email protected] [[email protected]] Sent: Monday, November 19, 2012 11:44 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] howto linear encoder On Thu, 15 Nov 2012, Ralph Stirling wrote: > The AS5306 magnetic encoder module A and B outputs > will certainly connect to the the parallel port fine. You > can configure Hal to do quadrature decoding from the > parallel port, but your linear stage can't go very fast. > The AS5306 has 40 pulses / 2.4mm = 16.7 pulses/mm. > If I recall correctly, LinuxCNC can typically read maybe > a couple thousand pulses per second from a quadrature > encoder via the parallel port, so you would be limited to > ~100-200mm/sec in speed. > > -- Ralph Is there hardware to go between the encoder and the parallel port to improve the resolution and speed I see some break out boards have inputs for encoders > ________________________________________ > From: Richard Ray [[email protected]] > Sent: Thursday, November 15, 2012 11:36 AM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] howto linear encoder > > On Thu, 15 Nov 2012, andy pugh wrote: > >> On 15 November 2012 19:13, <[email protected]> wrote: >>> How might I connect this, or something similar, via a parallel port >>> inexpensively, no MESA, to provide feedback for a stepper all running >>> linuxcnc >> >> Is it quadrature output? >> > > Yes > The "this" above was suposed to be http://wiki.makerbot.com/mle > Had a brain fart > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
