For high throughput the DS9490 is faster than the others. It automates more
of the search.
(I suspect that the communication via serial or i2c or USB is the slowest
part and the USB
commands for search and reading of the DS9490 require fewer back and forth
coordination
than the other chips).
The other common designs are here:
http://owfs.org/index.php?page=bus-masters
The DS2480 designs work well, although the usb->serial chip and it's
support in the linux
kernel vary. iButtonLink's design is excellent and can be used either in
DS2480 emulation
or using their native ascii protocol which probably is faster. (OWFS can
use either one, it
depends on how they are called on the command line).
Finally, don't neglect the ethernet designs like the OW-SERVER-NET ($99) or
LinkHub-E that have
several isolated lines and can be separated from your computer over the
network.
Paul
On Sun, Sep 29, 2013 at 5:40 AM, Martin Patzak (GMX)
<martin.pat...@gmx.de>wrote:
> I just checked the data sheet of the LinkUSB and it does not have a
> 1-wire chip at all but rather emulates the DS2480 - here an excerpt:
>
> DS2480B/9097U Emulation
> The LinkUSBTM is programmed to closely emulate a Dallas DS2480B serial
> port to
> 1-Wire line driver so that existing software can use it without
> modification. (The
> DS2480B is the basis for the Dallas DS9097 series of 1-Wire adapters.)
> This allows the
> LinkUSBTM to be used in place of the Dallas DS2480B in most cases where
> increased
> performance or reliability is required. Some DS2480B functions are not
> emulated by the
> LinkUSBTM, as described below.
>
>
> On 09/29/2013 11:22 AM, Vajk Fekete wrote:
>
> The key piece of information is, that ds9490 uses the ds2490 chip. Which
> is kinda discontinued by dallas/maxim. At a point they stated they have
> made a huge lot that will last years, and stopped production. They may have
> restarted production, or are just keeping price high enough to fulfill the
> prediction "stock will last for years"
>
> Your best bet is to get any clone that uses the ds2480 chip and some
> sort of usb serial port. As far as I know, the ds24080 is abou the same
> functionality as the ds2490, just missing the native usb interface.
>
> Hope the members with low level programming experience will
> confirm/debate that the 2480 is same level as 2490.
>
> all best,
>
> Vajk
>
>
> On Sun, Sep 29, 2013 at 9:18 AM, Martin Patzak (GMX) <martin.pat...@gmx.de
> > wrote:
>
>> Bruce,
>>
>> a Shop with a wide selection for 1-wire chips is:
>>
>> http://www.fuchs-shop.com/en/shop/17/
>>
>> I use the LinkUSB and I am very happy with it. I run a powered network of
>> about 15 temp-sensors and 3 IO-chips, which is driving my home heating
>> system.
>>
>> Cheers
>> Martin
>>
>> On 09/28/2013 07:37 PM, brucek wrote:
>>
>> Well, I tracked down my ow network failure to the melted DS9490R. It
>> looks like it could have actually been a fire risk.
>> Anyway, I see new DS9490R’s at Newark for $33.81 + s/h ($20 min), and on
>> eBay for $66.00 (really?)
>> I also see a Bulgarian one based on Chipset: FT232RL and DS2480B with
>> terminals for about $33 with shipping, and a Chinese one USB9097 with
>> 3.5mm TRS for $22.50 with shipping.
>>
>> Anyone have any experience with these cheapo adaptors?
>> Bruce
>>
>>
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