Page 5 of the datasheet (
http://datasheets.maximintegrated.com/en/ds/DS9490-DS9490R.pdf) has a
schematic including the DS9503 diode that might be a problem.
On the other hand, it's probably not worth your time chasing this down,
rather than just buying another 9490R.
This doesn't seem to be too common an occurrence -- I have DS9490Rs that
have been in service for nearly a decade. You could always try an
alternative USB 1-wire adapter, though they won't be quite as fast.
Paul
On Mon, Apr 14, 2014 at 12:40 AM, vermus <vermus.jab...@gmail.com> wrote:
> Paul Alfille-2 wrote
> > For reference I've included the initialization sequence for a functioning
> > DS9490R:
> >
> > DEBUG MODE
> > libow version:
> > 2.9p3
> >
> > .....
> >
> > CONNECT: ow_usb_cycle.c:(68) Bus master found: 1:6
> > DEFAULT: ow_usb_msg.c:(295) Opened USB DS9490 bus master at 1:6.
> > CALL: ow_parsename.c:(99) path=[]
> > CALL: ow_parsename.c:(99) path=[/uncached/bus.0]
> > DEBUG: ow_dir.c:(65) path=/uncached/bus.0
> > CALL: ow_dir.c:(100) path=/uncached/bus.0
> > CALL: ow_parsename.c:(99) path=[/uncached/bus.0/interface]
> > DEBUG: ow_usb_cycle.c:(125) Callback on /uncached/bus.0/interface
> > DEBUG: ow_parsename.c:(62) /uncached/bus.0/interface
> > DEBUG: ow_search.c:(32) Start of directory path=/uncached/bus.0
> > device=00
> > 00 00 00 00 00 00 00
> > DEBUG: ow_ds9490.c:(607) Index 0
> > DEBUG: ow_select.c:(66) Selecting a path (and device)
> > path=/uncached/bus.0 SN=00 00 00 00 00 00 00 00 last path=00 00 00 00 00
> > 00
> > 00 00
> > DEBUG: ow_select.c:(79) Continuing root branch
> > DEBUG: ow_ds9490.c:(495) DS9490 RESET. changed 15, flex: 1
> > DATA: ow_ds9490.c:(942) set flexible speed
> > DEBUG: ow_ds9490.c:(546) DS9490_Reset: OK
> > DEBUG: ow_ds9490.c:(683) Got 8 bytes from USB search
> > DEBUG: ow_ds9490.c:(711) gulp. Adding element 0:81 09 03 30 00 00 00 3A
> > DEBUG: ow_ds9490.c:(625) SN found: 81 09 03 30 00 00 00 3A
> > DEBUG: ow_search.c:(74) Device found: 81 09 03 30 00 00 00 3A
> > DEBUG: ow_cache.c:(547) Adding device location 81 09 03 30 00 00 00 3A
> > bus=0
> > DEBUG: ow_cache.c:(636) Add to cache sn 81 09 03 30 00 00 00 3A
> > pointer=0x7fbec55f928c index=0 size=4
> > DEBUG: ow_cache.c:(547) Adding device location 81 09 03 30 00 00 00 3A
> > bus=0
> > DEBUG: ow_cache.c:(636) Add to cache sn 81 09 03 30 00 00 00 3A
> > pointer=0x7fbec55f928c index=0 size=4
> > CALL: ow_parsename.c:(99) path=[/uncached/bus.0/81.090330000000]
> > DEBUG: ow_usb_cycle.c:(125) Callback on /uncached/bus.0/81.090330000000
> > DEBUG: ow_parsename.c:(62) /uncached/bus.0/81.090330000000
> > DEBUG: ow_ds9490.c:(607) Index 1
> > DEBUG: ow_cache.c:(479) Adding directory for 00 00 00 00 00 00 00 00
> > elements=1
> > DEBUG: ow_cache.c:(636) Add to cache sn 00 00 00 00 00 00 00 00
> > pointer=0x7fbec55f9298 index=0 size=8
> > DEBUG: ow_dir.c:(195) ret=0
> > DEBUG: ow_usb_cycle.c:(155) Finished FS_dir
> > DEBUG: ow_parsename.c:(62) /uncached/bus.0
> > DEFAULT: ow_usb_cycle.c:(191) Set DS9490 1:6 unique id to 81 09 03 30 00
> > 00
> > 00 3A
> >
> >
> > --------------------------
> >
> > The "short" sequence comes from the DS9490R itself -- it tests the line
> > and
> > reports if the 1-wire line is shorted out. The fact that it is reporting
> > says that the USB to DS2490 (the actual USB chip) connection is working.
> >
> > I presume you don't have anything connected to the bus master at this
> > stage
> > of testing? I.e. the socket is empty?
>
> Thanks again. Yes, usb is OK:
>
> root@hostname:/usr/src# lsusb
> Bus 005 Device 003: ID 04fa:2490 Dallas Semiconductor DS1490F 2-in-1 Fob,
> 1-Wire adapter
>
> Yes, the rj11(12) socket is absolutely empty.
>
> I guess, i need to buy another one device. :(
>
>
>
> --
> View this message in context:
> http://owfs-developers.1086194.n5.nabble.com/DS9490R-1-wire-bus-short-circuit-tp10564p10568.html
> Sent from the OWFS Developers mailing list archive at Nabble.com.
>
>
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