Hi again,

humm, just discovered another reason that can explain your problem:
If you  have revision A2 of the DS2482-100, bad luck for you...
see this errata from maxim:
http://pdfserv.maxim-ic.com/en/errata/2482-100A2.pdf

Pascal

2009/8/15 Pascal Baerten <pascal.baerten@gmail.com>
Hi,

I 'm using two ds2482-800 on the same bus without problem so I don't think that it is software related. (however I didn't upgraded recently still 2.7p21)

You may issue this command to discover chips present on the i2c bus:
i2cdetect -a 0
result for me:
I will probe file /dev/i2c-0.
I will probe address range 0x00-0x7f.
Continue? [Y/n]
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- 18 19 -- -- -- -- -- --
20: 20 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- UU
70: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
18&19 are the two 2482-800
for ds2482-100 on datasheet page 14, you will have the same addresses  0x18 and 0x19 repclively for 0 and 1.

Your behaviour is likely a problem with (i2c) cable lenght and/or pullup resistors missing or not strong enough.
 

On the owfs side, to ensure parallel communication on both adapter, I start two distinct owserver like this:
/opt/owfs/bin/owserver --i2c=/dev/i2c-0:0 -p 40666
/opt/owfs/bin/owserver --i2c=/dev/i2c-0:1 -p 40667
/opt/owfs/bin/owhttpd -s localhost:40666 -s localhost:40667 -p 81

Pascal
 
2009/8/14 K K <pcbexp@list.ru>

Hello Paul

You are right!
> With 2 on, only the first is seen.
Yes
> With the first removed, you can see the second?
Yes

Regards Konstantin

-----Original Message-----
From: Paul Alfille <paul.alfille@gmail.com>
To: owfs-developers@lists.sourceforge.net
Date: Fri, 14 Aug 2009 12:23:37 -0400
Subject: Re: [Owfs-developers] Two DS2482-100 on 1 i2c bus

> So basically you can't get two DS2482's to work on the same bus.
>
> With 2 on, only the first is seen.
> With the first removed, you can see the second?
>
> If I've summarized it properly, tell me so I know where to look for a problem.
>
> Paul Alfille
>
> On Fri, Aug 14, 2009 at 11:02 AM, pcbexp<pcbexp@list.ru> wrote:
> >
> > I use two IC DS2482-100 on one I2C bus with addresses 0 and 1. After typing
> > owserver - i2c = /dev/i2c-0:0 I receive the answer - i2c-adapter i2c-0:
> > sendbytes: NAK bailout. I see all sensors connected to chip #0 with owdir.
> > After command typing owserver - i2c = /dev/i2c-0:1 I receive:  i2c-adapter
> > i2c-0: sendbytes: NAK bailout.
> > But, I do not see any sensors which are connected to second IC with the
> > address 1.
> > To check my HW I have temporary desoldered IC with the address 0 from PCB
> > and then I see sensors connected to IC with the address 1. Please tell me
> > what should I  then to see the all sensors connected to both ICs.
> >
> > --
> > View this message in context: http://www.nabble.com/Two-DS2482-100-on-1-i2c-bus-tp24958893p24973207.html
> > Sent from the OWFS - Dev mailing list archive at Nabble.com.
>
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