check if i'm wrong, <10ms per scratchpad 2014-10-01 16:38 GMT-03:00 Colin Reese <colin.re...@gmail.com>: > Read scratchpad is pretty darn fast. I'd have to go back to my notes to see > exactly how fast. If I remember correctly, the convert will take something > like 1mA per device during conversion. > > You can also take turns with bunches of devices, reading a smaller subset so > as to optimize load on the bus. I started a thread on this previously. You > can issue a few tens of converts in succession, then go back and read > scratchpads of the devices you like. > > C > > On Wed, Oct 1, 2014 at 12:14 PM, Roberto Spadim <robe...@spadim.com.br> > wrote: >> >> here using usb-serial isnt a problem >> but if i remember some linux usb-serial drivers have a limit of >> howmany devices/computer could be used >> maybe it' near to 16usd/computer (per linux operational system) >> >> 2014-10-01 16:13 GMT-03:00 Roberto Spadim <robe...@spadim.com.br>: >> > :) probably yes >> > but any problem including more buses devices? >> > >> > 2014-10-01 15:57 GMT-03:00 Jerry Scharf >> > <sch...@lagunawayconsulting.com>: >> >> Roberto, >> >> >> >> I was planning on a large power supply and using simultaneous mode, but >> >> from my prior experience we still wouldn't be able to poll the >> >> temperature of all the devices very quickly. Thus the need for more >> >> buses to run in parallel. >> >> >> >> jerry >> >> >> >> On 10/01/2014 11:53 AM, Roberto Spadim wrote: >> >>> hummm you need to measure, or check a alarm condition? >> >>> >> >>> with 300 using alarm condition is possible only alarmmed sensors will >> >>> be reported at bus, it's not temperature convertion it's only alarm >> >>> information (alarm on/off) >> >>> >> >>> measuring temperature you should use (i don't remember the owfs file >> >>> name) a option to convert all sensors at same time, but ensure a good >> >>> power supply and after read one by one without convert temperature >> >>> (the same owfs file do this) >> >>> >> >>> 2014-10-01 15:04 GMT-03:00 Jerry Scharf >> >>> <sch...@lagunawayconsulting.com>: >> >>>> Hi, >> >>>> >> >>>> I am looking at using 18b20s to measure some load resistors and a >> >>>> couple >> >>>> other things. This is for a large bank of unit under test. The thing >> >>>> is >> >>>> that there are 300 load resistors plus 20-30 other channels to track. >> >>>> Then again, if we do a second monitor point, that's another 300 >> >>>> sensors. >> >>>> >From my experience with 30 sensors, having 300 is going to take a >> >>>> number >> >>>> of buses to be able to poll in finite time. >> >>>> >> >>>> How many buses make sense? What type of bus masters should I choose? >> >>>> We >> >>>> will have some type of monitor computer, probably a linux box. >> >>>> >> >>>> thanks in advance, >> >>>> jerry >> >>>> >> >>>> >> >>>> >> >>>> ------------------------------------------------------------------------------ >> >>>> Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer >> >>>> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS >> >>>> Reports >> >>>> Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper >> >>>> Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer >> >>>> >> >>>> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk >> >>>> _______________________________________________ >> >>>> Owfs-developers mailing list >> >>>> Owfs-developers@lists.sourceforge.net >> >>>> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> >>> >> >>> >> >> >> >> >> >> >> >> ------------------------------------------------------------------------------ >> >> Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer >> >> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS >> >> Reports >> >> Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper >> >> Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer >> >> >> >> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk >> >> _______________________________________________ >> >> Owfs-developers mailing list >> >> Owfs-developers@lists.sourceforge.net >> >> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> > >> > >> > >> > -- >> > Roberto Spadim >> > SPAEmpresarial >> > Eng. Automação e Controle >> >> >> >> -- >> Roberto Spadim >> SPAEmpresarial >> Eng. Automação e Controle >> >> >> ------------------------------------------------------------------------------ >> Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer >> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports >> Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper >> Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer >> >> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > ------------------------------------------------------------------------------ > Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer > Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports > Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper > Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer > http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers >
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