Hi,
ok, the PC was not connected, the multimeter was at Gnd and 1-wire-Data
The multimeter shows 4,93V all the time.
The buscoupler has a DS2480R+, hope it is also supported by the owfs :-)
info from the shop page:
| Datenschnittstelle | USB 1.1, mit FTDI FT232RL Chip (Virtuellen COM Port) |
| Kompatibilität | Zu DS9097U 1-Wire Adapter Seriell Anwendbar für alle Software, wie z.B. OWFS, IP-Symcon, FHEM, die für den DS9097U vorgesehen ist. Treiber für verschiedene Betriebssysteme im Downloadbereich des Artikels. |
| Anzeige LED | Power und Daten |
| 1-Wire Baustein | DS2480R+ |
| Spannungsversorgung | 9-32 VDC max. 500mA (Netzteil siehe Zubehör) |
| Ansteuerung | Ansteuerung durch alle Geräten die den DS2480 (Seriellen Master) unterstützen |
| Abmessungen | 85 x 34 x 70mm |
| Schutzschaltung | Verpolungsschutz für 1-Wire Ausgang und Versorgungsspannung |
| Isolation | Zwischen 1-Wire Bus und PC Schnittstelle min. 500VDC |
BR
Gesendet: Sonntag, 26. Juni 2016 um 11:56 Uhr
Von: "Jan Kandziora" <j...@gmx.de>
An: "OWFS (One-wire file system) discussion and help" <owfs-developers@lists.sourceforge.net>
Betreff: Re: [Owfs-developers] Communication to DS9097U not working
Von: "Jan Kandziora" <j...@gmx.de>
An: "OWFS (One-wire file system) discussion and help" <owfs-developers@lists.sourceforge.net>
Betreff: Re: [Owfs-developers] Communication to DS9097U not working
Am 26.06.2016 um 10:11 schrieb samuix:
> Hi,
> in the user guide of the bus coupler is mentioned:
> "Hinweis: Es ist die Funktion "Strong Pullup" zu aktivieren." , i.e. the strong
> pullup function should be activated.
> How can we activate that function ?
>
The DS2480B (the chip inside a DS9097U) controls the strong pullup
automatically. If I read the sources correctly, owfs sets up the strong
pullup duration to "infinite" in the DS2480B configuration sequence, so
it should be activated.
But maybe it isn't?
> How can we perform your mentioned check?
>
Don't connect your setup to a PC. Power your host adaptor, put a
multimeter to the bus, and check whether it is still at +5V after a
minute or so. If not, connect a 1,5k resistor from the onewire bus line
to +5V.
Kind regards
Jan
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> Hi,
> in the user guide of the bus coupler is mentioned:
> "Hinweis: Es ist die Funktion "Strong Pullup" zu aktivieren." , i.e. the strong
> pullup function should be activated.
> How can we activate that function ?
>
The DS2480B (the chip inside a DS9097U) controls the strong pullup
automatically. If I read the sources correctly, owfs sets up the strong
pullup duration to "infinite" in the DS2480B configuration sequence, so
it should be activated.
But maybe it isn't?
> How can we perform your mentioned check?
>
Don't connect your setup to a PC. Power your host adaptor, put a
multimeter to the bus, and check whether it is still at +5V after a
minute or so. If not, connect a 1,5k resistor from the onewire bus line
to +5V.
Kind regards
Jan
------------------------------------------------------------------------------
Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
Francisco, CA to explore cutting-edge tech and listen to tech luminaries
present their vision of the future. This family event has something for
everyone, including kids. Get more information and register today.
http://sdm.link/attshape
_______________________________________________
Owfs-developers mailing list
Owfs-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/owfs-developers
------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape
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