Fair enough, although I'm seeing machines that have both an RJ-45 and Wifi, which would address the problem.
Javid ----- Original Message ----- From: "Peter C. Wallace" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Tuesday, October 30, 2007 8:17 PM Subject: Re: [Emc-users] Ethernet I/O > On Tue, 30 Oct 2007, Javid Butler wrote: > >> Date: Tue, 30 Oct 2007 19:36:35 -0600 >> From: Javid Butler <[EMAIL PROTECTED]> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <[email protected]> >> To: "Enhanced Machine Controller (EMC)" <[email protected]> >> Subject: Re: [Emc-users] Ethernet I/O >> >> Jon wrote- >> >>> Given all the required overhead to read and write multiple >>> packets, it is already pretty close to chewing up a whole >>> millisecond, and there's no way it could handle even 5 KHz >>> servo update rate. So, I really don't think CAN is a good >>> candidate. >> >> I agree. The thread started because of concern about the parport going >> away >> on newer machines, and how to replace it. I have not seen any computers >> with >> a CAN interface built in, which would defeat the whole purpose. We could >> consider USB, but that has problems as well and met with resistance >> upthread. Ethernet is relatively easy, affordable and available, and as >> Jon >> mentioned before is isolated. > > Not arguing for CAN, but Ethernet being built-in is not a great advantage > unless there are 2 channels built in, since real time Ethernet (real time > meaning fast enough to close a servo loop) will not get along with normal > Ethernet traffic and a network connection is almost a necessity, requiring > a > add-in card in most cases. Not much different from the parallel port case, > though faster. > > > Peter Wallace > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
