The original Smooth Stepper also suffered from USB issues which seemed to be related to grounding or isolation issues??
Steve probably knows a lot more about that than I do. The later designed, Ethernet Smooth Stepper device does not seem to exhibit similar issues. Dave On 2/28/2014 10:32 AM, Steve Stallings wrote: > Andy's description of the Mach external pulser API > is correct. > > The device driver gets to select the length of the > buffer and also select a "pulses per time slice" > or a way-point version of the data. > > USB under Windows seems to require at least 1 second > of buffered data to be workable. Not pleasant, but > lots of people use it anyway. USB itself is not the > problem, it is the Windows protocol stack that can > cause significant delays. It is optimized for throughput > not minimum latency. > > E-Stop, limits, homing, probing, and threading are the > responsibility of the device and its driver. This results > in lots of complicated code in the driver and significant > variations in performance from one type of device to another. > > Steve Stallings > > > > >> -----Original Message----- >> From: andy pugh [mailto:bodge...@gmail.com] >> Sent: Friday, February 28, 2014 8:52 AM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Printrboard and LinuxCNC >> >> On 28 February 2014 13:36, Michael Haberler >> <mai...@mah.priv.at> wrote: >> >>>> The question, then, is how come Mach3 can have USB >> cabling, but LinuxCNC >>>> can't? (see the KX* mills from Arc Eurotrade in the UK; >> now with USB input) >>> I have no idea about that API uses over USB, but I'd be curious >> There is a clue on page 26 here: >> http://www.warp9td.com/documentation/SmoothStepperUserManualV1.0.pdf >> >> It looks like the SmoothStepper accepts 1kHz position data, rather >> similarly to the Mesa and Pico boards. The difference seems to be a >> buffer of around 1 second. >> I assume that e-stop (at least) is handled on-board. I rather assume >> that limit switches and homing need to be too. >> >> -- >> atp >> If you can't fix it, you don't own it. >> http://www.ifixit.com/Manifesto >> >> -------------------------------------------------------------- >> ---------------- >> Flow-based real-time traffic analytics software. Cisco certified tool. >> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer >> Customize your own dashboards, set traffic alerts and >> generate reports. >> Network behavioral analysis & security monitoring. All-in-one tool. >> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/41 > 40/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------------------------ > Flow-based real-time traffic analytics software. Cisco certified tool. > Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer > Customize your own dashboards, set traffic alerts and generate reports. > Network behavioral analysis & security monitoring. All-in-one tool. > http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
