Uwatec Smart Z data download takes 1.5 hours for only 4 dives

Jef Driesen jef at libdivecomputer.org
Tue Dec 24 00:34:34 UTC 2013

On 24-12-13 03:21, Dazed_75 wrote:
> I have to wonder how much data is being downloaded and the data rate.  I learned
> my Aeris XR2 was recording and reporting data for 1 second intervals.  That can
> be a lot of data depending on what his computer is reporting.  Also, according
> to http://compnetworking.about.com/od/homenetworking/g/bldef_infrared.htm there
> are 3 different data rates for IR transfer and the slowest is pretty slow:
>     Performance - Infrared technology used in local networks exists in three
>     different forms:
>       * IrDA-SIR (slow speed) infrared supporting data rates up to 115 Kbps
>       * IrDA-MIR (medium speed) infrared supporting data rates up to 1.15 Mbps
>       * IrDA-FIR (fast speed) infrared supporting data rates up to 4 Mbps
> Then too, if there are transmission errors to recover from, it COULD be pretty
> slow.  Sorry for top posting, but this did not really fit into the topic
> discussion anywhere.

You might be surprised, but 115 Kbps is actually fast compared to the baudrates 
used by many dive computers. Even the fastest ones use only 115 Kbp. That is 
about the fastest standardized serial baudrate, so I'm not sure higher speeds 
are even possible in a portable way.


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