Paul,
Just to be clear, you are telling me that unless I supply power directly
to the thermometer sensors, I cannot expect simultaneous to help me
here. It might be possible for me to provide power to the sensors from
the hub itself, I will investigate that.
Jim
Paul Alfille wrote:
> 1. Simultaneous supposedly doesn't work with parasitic power -- there
> is too great a draw on the data line.
> 2. There will always be a 1 second pause, but with simultaneous, only
> once. I.e., you write to simultaneous once, and conversion is
> triggered on all the temperature sensors, and after that second, all
> the temperature values can be read directly from the chips.
>
> Paul
>
> On 5/25/06, Jim Duda <[EMAIL PROTECTED]> wrote:
>
>> FYI, I'm currently using owfs-2.3p6.
>>
>> Jim
>>
>>
>> "Alfille, Paul H.,M.D." <[EMAIL PROTECTED]> wrote in message
>> news:[EMAIL PROTECTED]
>> Your understanding is correct.
>>
>> I'll check the code.
>>
>> I assume your sensors are separately powered, rather than parasytic.
>>
>> Also, a minor point, that 750msec is actually 1sec, based on large
>> experience of
>> the 1-wire community.
>>
>> Paul Alfille
>>
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED] on behalf of Jim
Duda
>> Sent: Thu 5/25/2006 1:50 PM
>> To: [email protected]
>> Subject: [Owfs-developers] Question on Simultaneous
>>
>> Can someone please help me with simultaneous?
>>
>> My understanding is that writing a value to the
>> simultaneous/temperature file
>> will cause
>> a temperature conversion, but not incure a long delay in the write
>> operation, as
>> compared to reading the actual temperature.
>>
>> I"m trying to insure that whenever I read a temperature value, I'm
always
>> reading from the
>> cache, to avoid a long delay on the read response.
>>
>> I'm running owserver without a -t parameter, so that should default
to 10
>> seconds
>> for which data remains in the cache.
>>
>> I have 4 thermometers on owfs, all of which are attached to a hub.
>>
>> I have a perl script which does the following:
>>
>> On odd seconds, it issues a write of "1" to all the
>> simultaneous/temperature
>> files
>> adjacent in the hierarchy to each thermometor. I'm assuming this
>> starts a
>> temperature conversion for each thermometer. I believe the typical
time
>> for a temperature conversion is 750mS.
>>
>> On even seconds, it issues a read of each temperature device. The
>> reading
>> of 4 devices appears to take 6 seconds. I was expecting the reads
to be
>> much quicker, I'm assuming they should be coming from the cache.
>>
>> I've also changed the delay between writing and reading to 2
seconds, but
>> I get the same behavior.
>>
>> Is my understanding of "simultaneous" correct?
>>
>> Thanks,
>>
>> Jim
>>
>>
>>
>>
>>
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