Re: Re: Simat 1 wire Hubs

[Jon Payne <jgpayne@xxxxxxxxxxxxxx>]

Great to know others are using 1-wire on UKHA!

I have now speeded up my network scanning a little by using the DS2409
SmartOn feature - this lets you determine whether there are /any/ devices
on a branch without having to actually scan it which obviously saves time
if a branch is unused or used for touch contact ibutton applications.

I'm going to look at optimising the temperature gathering now by grouping
sensors by path (location on branches), which will also apply to polled
sensors in general, and by starting temperature conversion off
simultaneously (which I've only just realised can be done) for all sensors
on that path, then fetching their readings.

cheers,
jon


----- Original Message ----
From: Frank Mc Alinden <frankmc@xxxxxxx>
To: ukha_d@xxxxxxx
Sent: Wednesday, 23 May, 2007 7:49:12 AM
Subject: Re: [ukha_d] Re: Simat 1 wire Hubs


Hi Mark / Jon

> Sort of - as I understand it, it does a startup scan to detect new
> devices and adds them to the database of connected devices. It will
> then scan for devices in the database so if a device has been
> connected at any startup it should then be scanned for. However, I
> think the new hub code breaks this in that the hub branch number is
> remembered at startup and the devices are only searched for on that
> branch.

That appears to be the case from my observations as well....

> Nice to see some 1-wire discussion here, I'm just getting into it and
> going through the opnode sorce code has helped a lot but it's good to
> hear of other ways of doing things.

Keep us posted on your progress

Frank