On Saturday 22 April 2017 14:26:56 Linden wrote: > When I worked in the semi con industry we used to have converters for > regular rs232 serial com at 9200 bod. Was a 9 pin sub d at one end of > the adaptor then 2 glass fiber cables plugged in to the other. The > receptacle and the fiber cable were made by omron. I think the device > itself was made in Austria and grew out of some ones basement to small > production. The only problems we had were the glass fiber portion of > the cables not being crossed when some one had it apart or corrosion > on the little PCB due to exposer to HF fumes and other nasties. This > was on machines designed and built in the early 90. > Gee I wish I could convince folks I do NOT need a serial signal at such and such a baud rate. ALL I want to do is turn on an led shining into the fiber at one end, and detect it with a high gain phototransistor at the other end. Seems pretty simple to me. Turn on the led shining into the end of the fiber for 3 u-secs, the phototransistor does a turnon at the other end, and voila! a step pulse, with no noise being shoved into the circuit on either end. Leave another led turned on for the duration of the dir signal when I want to reverse the direction. rs-422-485 gismos I have a bag of 5, still haven't found a place to put them other than hanging on the end of a usb extension cable as a pretty, lights up bright red so I can pick my way out of the garage if the overhead lighting breaker fails. I was going to use one to drive my vfd, till I found the fake vfd didn't didn't have any seriel circuitry, not even designed in but un-populated on its boards. A SpinX1 runs it rather nicely after I programmed it from its own keypad.
> On April 22, 2017 9:56:27 AM PDT, Gene Heskett <ghesk...@shentel.net> wrote: > >On Friday 21 April 2017 19:10:23 dave wrote: > > > >Did you get my PM to you yesterday evening? > > > >> Years ago when I thought fiber might catch-on I grabbed some > >> 62.5/120 plenum fiber at Boeing Surplus. > >> I got as far as connecting a 10-base2 card to a fiber converter > >> fishing out both ends of the fiber on the reel > >> and terminating with 3M (?) hot-melt end. It worked nicely but 10 > >> Mhz isn't straining fiber very much. The good thing about fiber is > >> the > > > >low > > > >> error rate; something around 1E-12. I just disposed of the > >> converters a few days ago. > >> Still have several Km of fiber and a few connectors. 10-baseT works > >> just fine thru conduit buried between desktop > >> (house) and shop. About 35 m. > >> > >> Dave > > > >I found, at newark/element14, some more fiber fittings, in this case > > a > > > >board mount cover for a 603 sized smd led that the fiber can be > > plugged > > > >into, takes 2mm od fiber, snap fit in board holes, at $0.17 a copy > > from > > > >Bivar. Found some fiber but in 10" lengths, assembled, so still > >looking. > >The key brand name seems to be Bivar for the hardware. 603 size smd > >leds > >are similarly priced. I did find an smd phototransistor, but its > > target > > > >is not centered in the package. Not a major problem since I'll > > probably > > > >be designing the pcb, but it would be nice to use the same pcb > > pattern on both ends. Since Bivar has a phone numnber in the pdf, > > I'll see if I > >can contact them Monday. Hopefully its still a good number. > > > >> On 04/21/2017 01:53 AM, Erik Christiansen wrote: > >> > On 20.04.17 14:51, Gene Heskett wrote: > >> >> The led makers have now had 40+ years to design such a package, > > > >and > > > >> >> I fail to understand why it has not happened. > >> > > >> > Somewhere near the bottom of my junkbox is an envelope with a > >> > pair of Siemens opto-link (real product name long forgotten) > >> > devices, which came out around 35 years ago. They're small grey > >> > rectangles with through-hole pins, and a fibre entry with > >> > ring-nut (like on a collet holder) on one end. Dunno if they're > >> > still marketed, though. > >> > > >> > At Digi-key, this Broadcom offering looks just like one end: > > > >https://www.digikey.com/product-detail/en/broadcom-limited/SP0000638 > > > >> >58/516-2872-ND/2220931 > >> > > >> > But that would leave the rest of my coil of shielded twisted-pair > >> > (for RS485) cable gathering dust. With 7v of permissible > >> > common-mode, and differential transmission for noise immunity, > >> > what more is really needed? RS485 transceivers are around $2 to > >> > $3 IIRC. (I saw some for 25c today, but they were surplus stock > >> > of a now obsolete device.) > >> > > >> > Erik > > > >-------------------------------------------------------------------- > > > >> >---------- Check out the vibrant tech community on one of the > > > >world's > > > >> > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > >> > _______________________________________________ > >> > Emc-users mailing list > >> > Emc-users@lists.sourceforge.net > >> > https://lists.sourceforge.net/lists/listinfo/emc-users > > > >--------------------------------------------------------------------- > >- > > > >>-------- Check out the vibrant tech community on one of the world's > >> most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > >Cheers, Gene Heskett > >-- > >"There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > >-Ed Howdershelt (Author) > >Genes Web page <http://geneslinuxbox.net:6309/gene> > > > >--------------------------------------------------------------------- > >--------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > >_______________________________________________ > >Emc-users mailing list > >Emc-users@lists.sourceforge.net > >https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
