talking about scada, a good solution is opc, but it's a windows option to
scada, maybe another protocol like modbus should be more "open", since
owserver work over a file system, we should have a file to memory address
translator, i don't know how we could do this in a fast and simple way
(without configuration), maybe a convertion table should be used, and maybe
another owxxx should be made, maybe owmodbus or owopc, i started a project
in php with owmodbus, but i didn't finished, the crc16 used by modbus stay
at php.net page:
http://br2.php.net/manual/en/function.crc32.php
*roberto at spadim dot com dot br*
08-Apr-2006 04:52 <http://br2.php.net/manual/en/function.crc32.php#64127>
maybe that could help, some scada programs works with filesystem too, but a
owopc or owmodbus should be a industrial standard, when i started owmodbus i
was thinking about a working modbus network talking with owfs, but i changed
my project to tcp/ip with a plc and my project stoped, if anyone want a help
with this i could help and we could reopen the project
thnkx guys
very good work with gauges and charts!
2009/5/3 Mike Zimmerman <[email protected]>
> I like it Rob! Ive been messing around with data visualization for an open
> source tank monitoring project a friend and myself are working on. I seemed
> to have settled on google's visualization API, however since its a cloud
> model it really requires the user to have a persistent internet connection.
> You can take a look at http://home.mkzimms.com:8008/tankplay/ for a quick
> mock up of a temperature view i did, we will be doing the interface in extJS
> later on. You'll have to excuse the lapse in data, i was making some
> changes to my monitoring script so it has been shut off for a few days.
>
> I do however find your solution more appleaing considering the use of a
> canvas on an image which allows for way more customization. I will
> definitely spend tonight playing with it.
>
> Mike
>
> ----- Original Message -----
> From: "Rob Conway" <[email protected]>
> To: [email protected]
> Sent: Friday, May 1, 2009 9:45:34 AM GMT -05:00 US/Canada Eastern
> Subject: [Owfs-developers] Ever wanted a SCADA interface for owfs
>
> As everyone on this list know’s we have the answer to low cost data
> collection,OWFS However there is a missing link which I believe has not
> been explored, creating some standardized display of data that people can
> use on their web servers. The owfs http interface is fantastic from a
> maintenance point of view however does little for someone wanting to publish
> the information via the web. Well after 2 years I think I have found the
> third piece to this puzzle. I have tried all sorts of techniques to get the
> data onto my web site however this is GREAT!.
>
>
>
> Welcome Raphael.js
>
>
>
> This small 100k javascript library enables you to create dynamic graphics
> (same as Scalable Vector Graphics) with no programming at all.
>
>
>
> An example
>
>
>
> <!--Create Gauge Divs-->
>
> <div id="g1" class="gauge1"></div>
>
>
>
> <!--Create Raphael papers and assign to Div ID's-->
>
> <script language="javascript" type="text/javascript">
>
> paper1 = Raphael("g1", 155, 155);
>
>
>
> Now once a canvas (paper) has been assigned you can draw directly onto it
>
>
>
> This creates a circle at x, y, 6 px diameter etc etc
>
> Paper1.circle(81, 98, 6).attr("fill", "silver").attr("stroke", "black");
>
>
>
> This creates a line and I can rotate the line i.e. gauge pointer!
>
> Paper1.path({stroke: "red", "stroke-width": 2, "stroke-linecap":
> "round"}).moveTo(80, 100).lineTo(45, 110).rotate(*rotation*,81,100);
>
>
>
>
>
> If you have not visited my site for a while and are interested in creating
> dials and gauges bar graphs etc take a look www.rjconway.homeip.net
>
>
>
> The gauge background is just an image however the scale graduation,
> pointer, LCD display provides a reusable widget that can display any data.
> I have documented the code so you should be able to see whats going on very
> easily.
>
>
>
> I get a text file from server (Uses Ajax), Split the txt file into an
> array and then split again so you end up with an array of variables from the
> simple txt file.
>
>
>
> You can see the txt file (better cut and paste the whole line)
> www.rjconway.homeip.net/aqua_tag.txt
>
>
>
> *Extract from code*
>
> Tag(x) array explodes the array[1] into the following:
>
> [0]Description
>
> [1]Engineering units
>
> [2]Value
>
> [3]Setpoint -NOT USED
>
> [4]HighScale
>
> [5]LowScale
>
> [6]HighAlarmValue
>
> [7]LowAlarmValue
>
> [8]Alarm Status, 0=Normal 1=High 2=Low -NOT USED
>
> [9]Alarm Acknowledgement 0=Ack 1=UnAck -NOT USED
>
> [10]Alarm Time Epoch -NOT USED
>
> [11]Auto/manual, 0=Man 1=Auto -NOT USED
>
> [12]Scan status, 0=Bad 1=Good
>
> [13]Show alarm bands, 0=no bands, 1= Normal range, 2=Low alarm,
> 3=High alarm, 4=Both Low & High Alarm Bands
>
> [14] Max value last 24hrs (Will be used to show history) -NOT USED
>
> [15] Min value last 24hrs (Will be used to show History) -NOT USED
>
>
>
> So I simply use the array data to drive the gauges. i.e. to get the value
> its just “Tag1[2]” . The gauge I created has a pointer movement of
> 212degree’s thus there is some calcs based upon the high and low range of
> the gauge to calculate the rotation required, I also calculate the numbers
> displayed on the graduations. The txt file is simply created with a bash
> script running every 90 seconds. You can simply change the low / high range
> in the txt file and the gauges will adjust, thus with a simple loop you can
> animate all the gauges. My text file contains 5 different tags.
>
>
>
> I am happy to share any code, the gauges have simply been built in
> powerpoint and I have 4 different coloured gauges. I am working on a set of
> bar graph displays. I know the code looks simple now but it has taken me a
> lot of time to get it to the point of easily refreshing the data, being able
> to dynamically build trends on the fly. I can push on solo with this
> development or owfs group could look at how we could maybe create a more
> standard interface to get the data from the server to the client. Most of
> the data in the array is fixed or calculated via a bash script however a lot
> of it could also come from the 1wire device parameters.
>
>
>
> Can you see the power of owfs, rrdtool and Raphael combined, nobody else
> has this solution for $0.00 ? checkout the Raphael.js web site for other
> demo types. We (owfs group) have a complete solution from data gathering,
> trending and now a rich graphic environment potential all without any real
> programming. If we standardized on a data array set (similar to above)
> “collectively” we could build graphic elements to be simply used within any
> web site. These graphic elements could be part of the owfs web site to be
> used by everybody. You could build a great weather station and not be
> locked into the interface someone else wants you to see.
>
>
>
> I still have some work to do on the gauges, just gotta get the alarm bands
> auto drawn on the scale however thought I would share this as it stands
> now. You can now dynamically change the trend data in real time and redraw
> the data, this bit is really cool. I still have to link the gauges so when
> clicked they will call their respective history for the trend. The web site
> trend just shows the weather at the moment. If you wait 90 seconds and
> press refresh you can see the gauges update, I will eventually put the
> refresh on a timer. However no time this weekend so will finalise it next
> weekend however wanted to share progress with the group to see if I can get
> any interest in further development or potentially some standardization in
> data transfer.
>
>
>
> rob
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> ------------------------------------------------------------------------------
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>
>
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>
--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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