I tried the 10k pull up resistor, it doesn't help.  

Additional info: I have SS pin enabled on both slaves

--- "D. Jay Newman" <jay@sprucegrove.com> wrote:

> > I tried to sum the two SDO signals of the two
> Slaves
> > via 1K resistor, but the comm is still
> intermittent. 
> > Is there other anyway around this?  Thanks!
> > Best regards,
> 
> I use 10k resisters for pull-ups and have not had
> such problems.
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> D. Jay Newman           ! Polititions and
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> jay@sprucegrove.com     ! go but the engineers and
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