Re: BSC and OneWire]

["Michael McSharry" <mcs101main@xxxxxxx>]

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The only performance difference I have seen between the USB and Serial
vers=
ions is that the USB will hold the discrete (e.g. DS2405) outputs when the
=
adapter has been released from the drivers, while the DS9097U will allow
th=
e state to decay.  This may only be with parasitic power, but this is how
I=
have all my devices connected.  The only time this comes into play is if y=
ou run multiple adapters on the same PC and the softare needs to release
on=
e to talk to the next.  Note that this OneWire application will drive
multi=
ple ports, but as currently configured it will not allow other
applications=
to access the one-wire drivers.  This may come into play if you try to use=
the ibutton viewer when this application is running.

There are other compatible adapters such as Link and the parallel version
o=
f the DS9097.  There as some problems with variations from the DS9097U so
I=
would stick to that one if you want a serial interface.

I agree that samples are the best way to get  started, but sometimes they
c=
ome well after you have forgotten that you ordered them.  The other word
of=
caution about dealing with Maxim-ic is that they can hit you hard for ship=
ping.  Order 3 sensors and you may get 3 packages with shipping charges on
=
each.  They have also changed their pricing structure in the last year to
p=
rovide more margin for the middlemen.

I obtained my 1-wire goodies a few years ago.  Prices were around $2 per
Te=
mp or Discrete sensor and I ordered 25 of each at the time.  $10 per box
sh=
ipping.  Humidity sensors which are made from DS2438 are best obtained in
M=
exico at AAG.  They also have nice counter modules based on the DS2423.

I have no issue with making the database key an option.  Also no issue
with=
making the State key an option as well.
----- Original Message -----=20
From: Kevin Hawkins=20
To: xAP_developer@xxxxxxx=20
Sent: Saturday, November 27, 2004 9:54 AM
Subject: Re: [xAP_developer] BSC and OneWire]


Great stuff Michael- in fact it's going to make me go out and buy a=20
1-wire interface and some 1 wire bits ! Is there a preference between=20
the RS232 and teh USB version ?

I think it would be good for you to announce this in the main xAP=20
Automation list too - and I'll sort out some other mentions too to get=20
it known..

I wonder if we could have an option setting in the app to disable the=20
inclusion of the Database key name in the schema - Actually I was=20
thinking it would be a good thing for all developers who add their own=20
custom key value pairs into a standard schema this way to include such=20
an option. Do people agree ?

Kevin

Michael McSharry wrote:

> Attached is xAPmcs1Wire.exe which is an xap interface to Dallas
1-wire=
=20
> network using DS9097U (serial) DS9490 (USB) or functional
equivalent=20
> PC adapters to the 1-wire network.  A full set of 1-wire/Ibutton=20
> devices typical of an HA environment are supported.  This includes=20
> temperature, voltage, humidity, lightning count, water flow,
rainfall,=
=20
> wind direction, wind speed, relays, switches, air pressure and=20
> probably some others that don't come to mind at the moment.  I'm=20
> making it available to enhance the library of BSC-compliant
application=
s.
>=20=20
> The software uses the drivers developed by the Dallas Semiconductor. =
=20
> If not already installed on the PC then they can be downloaded from=20
> ftp://ftp.dalsemi.com/pub/auto_id/licensed/Install_1_Wire_Drivers_v400b=
3.exe
> Earlier version of these drivers will also function, however some=20
> devices are not supported with the _v3 and erlier drivers.  These=20
> drivers utilize the Microsoft Jave Virtual Machine.  The JAVA VM
will=20
> need to be enabled on the PC.
>=20=20
> The file can be placed anywhere.  It will create a \config
subfolder=20
> and may create a \data subfolder.  When executed it will run in the=20
> tray and a mouse click on the icon will provide selection options=20
> which include "Setup" "IO Window" and
"Exit".  The other options have=20
> been disabled as they only have meaning in the context of a system=20
> with other xap nodes that support health, redundancy management and=20
> centralized configuration management.
>=20=20
> The "Setup" will show a Windows GUI that I quickly put
together to=20
> provide a stand-alone user interface.  Normally this node is=20
> configured via a centralized configuration user interface.  The xap=20
> schema to support the configuration discovery and modification are=20
> still enabled, but will cause no harm.=20
>=20=20
> The application-layer logic of this node was extracted from an=20
> existing Homeseer plugin so some of the setup context is not obvious.
=
=20
> For typical use the "Poll" button, the Metric/English units
selection,=
=20
> and the sample interval will be the only setup items of interest.
>=20=20
> The analog values are returned using the xapBSC.info schema.  The=20
> discrete values are reported with xapBSC.event and set with=20
> xapBSC.cmd.  All aspects of the BSC 1.3 schema have been implemented.
=
=20
> Each 1-wire device has 6 xAP UID values reserved.  This means a
little=
=20
> over 40 devices can be supported per instance of the application. 
The=
=20
> body of the BSC xap message also has a Database=3DTrue key/value as=20
> these values are intended to be recorded by the xap datacollection
node=
.
>=20=20
>=20=20