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I wanted to try to use the DS2450 A/D converter to interface with Mango to monitor field signals from HVAC equipment. I have only several temp sensors on my one wire so far. I use the standard serial adapter to my Win XP PC as the bus host.

I built a circuit to interface with and isolate from the field voltage which uses an LTV-814 (one channel) up to LTV-844 (four channel) AC/DC input opto-isolator. The output transistor of the LTV chip drives the input of the DS2450. I am using 5VDC (currently USB powered) to drive the output side of the LTV chip.

Initially it did not work. However after plowing through the DS2450 datasheet, I learned the default setting for the DS2450 for input voltage is 2.55 volts maximum on the inputs. Since I was using 5V it did not know what to do and returned a big fat 0.0 to Mango (and One Wire Viewer). I then used a voltage divider network to bring the input down to a level that the chip would recognize and report in it's default state.

An optional input value is 5.10V, but there is currently no way in Mango to select the input voltage or the resolution (default 8 bits) of the DS2450.

The default settings for memory map page 1, Control/Status starting at 08h is:
(hex) 08 8C 08 8C 08 8C 08 8C

If it could be modified to:
(hex) 08 8D 08 8D 08 8D 08 8D this would give 5.10V input enabled

The settings are all volatile and revert to default when the chip is repowered so they need to come from the host software every time the one wire bus is powered or reset. I'm not a programmer so I leave that to Matthew as a possible improvement !

Hope this helps someone.....at least I got to relearn hex to figure this out. Short lesson is if you are over the input voltage you will get 0.0 output. Also, when you really are at zero input voltage the chip output floats at 0.03 or so on all channels. I have two DS2450 and they both do the same thing.

Next job is to get it off my desk and into the field.

Hi,

I just discovered Mango M2M. I am so pleased that someone has taken the step to allow the little guy onto the feild.

I downloaded and installed and WOW discovered the device instantly and connected. Worked great out of the box. :D
I have some more learning to do, but I wanted to say thank You Very Much. I will be testing and playing for days to come. :lol:

I can see a very bright future for this product.

Thanks again..

@Keith said:

Hi

I've just found your question. I've got about 30 temp sensors and some switches set up on a 1 wire network. I'm planning to control my complex heating system through it using Mango.

Getting it to be reliable is a right pain. Its very sensitive length and hoe the sensors are added. This article is very helpful
http://www.maxim-ic.com/appnotes.cfm/an_pk/148

If you want to do some testing to check the system is working either use the dallas software or LOGTEMP by mr soft both free

Here's my public view page http://www.bacwak.net:8080/public_view.htm?viewId=8

Which is a bit scrrewed at the moment as i have been playing with dials and buttons on it

Cheers

Keith

Keith,

What switches are you using and how do you have them connected? Powered, parasite, pullup resistors, etc? The reason I ask is that I have switch module D2P from EDS (DS2406 based). Mango sees the switch (but only one, it should see A and B since it is a double I/O) but it does not sense the switch staus (binary change). I am using this on serial input and parasite mode. Interestingly enough I have the same exact problem with LogTemp. However, Dallas/Maxim viewer sees status changes perfectly.

http://www.embeddeddatasystems.com/assets/images/supportFiles/manuals/D2PandD2PC.pdf

Anybody else, feel free to chime in.

BTW, love the Mango software so far.

Mike

Nice catch. This was a bug in Modbus4J in the WriteMaskRegister failover. I've checked the fix into the CVS repo.

@mlohbihler said:

@Anonymous said:
take look at:

http://www.opnode.org/dokuwiki/doku.php?id=home

there may exist some good synergy between their open product and yours

Thanks for the reference. I have reviewed the site and contacted Daniel. I'll post any interesting updates here.

Tried to find from forum if connection OK, but could not find out (with my limited IT-knowledge). Any success / how to integrate opn-one with mango?

Mango M2M:

Currently supported protocols include BACnet I/P, Modbus (ASCII, RTU, TCP, and UDP), 1-wire, SNMP, SQL, HTTP, POP3, NMEA 0183, and many proprietary protocols developed by hardware vendors. Mango also supports a "virtual" data source that can generate data for benchmarking or testing purposes. More protocols are being added regularly.
opn.one (or should I look something else?)
xAP BSC schema
xAP web service

In general (as newbee) it's quite difficult to fugure out from this forum (and web in general), which products / vendors (even as list of excample, not complete) could be connected easily to mango M2M (as my prim. is to find as-easy-as-possible-but-scalable system).

Also would be nice, if subjects mentioned in forum as "open", could be updated as "solved" when new releases / updates published. I know it's more work, but would help a lot when studying / implementing your S/W.

Overall, keep up good work :!:

@thefixer said:

Has anyone integrated one into mango currently, what was the ease of configuration?...just trying to determine if this will fit my needs or Ha7net

Seems to be that I am wondering the same 1/2y after you.

My main consirn has been 1-wire PC-load, so TEMP08 would be logical pick for my needs (local 1-wire network next to old PC with XP, around 5 pcs dual general purpose counters, around 20 pcs temp measurements).

Which one you ended up? Any ready_made_tricks to share?

Ok
Problem sovled ( also with spinwave's help)

the port should be 502 not 80 ,
the offset start at 101 and on .
the data arrive as 2 bytes bsigned integer .

10nx to all
--udi

Picked one up for 79$ on ebay, unit functions perfectly at 1% accuracy monitoring a 240v panel...setup was fairly straght forward..monitors energy, current, and voltage...next step temperature monitoring

The subject says it all, anyone using one of these controllers for 1-wire devices? Just curious if setup is straight forward

Which one wire device are you planning on using?

Yes! I use the kv011... It seems to be very stable and works great. I have written a custom app which reads the values from the serial port, and places them in a database. I then use the database base protocol, provided with Mango, to pull in the results.

Glad to hear. Thanks for the feedback Keith.

I had made the assumption in my previous post that your instance of Mango would exist in your corporate environment. You are correct though: you can run an instance local to your machine. In fact, you can run machine-local instances and have them communicate with a corporate instance, but this would bring you back to your machine-to-corporate connectivity problem.

The remote graphical views will work, but the issue will still be connectivity: browser interfaces require TCP/IP networks. Assuming some internet connection is available you may still have issues with firewalls and such. However, Serotonin has some new software products to solve this problem as well. Instances of Mango behind firewalls and/or on internal networks can be made available by using a Serotonin tunneling agent.

If you have a corporate Mango instance talking to machine instances, you can do much better than just semi-daily. You can have near real-time updates. Check out the documentation on Publishers.

I do not have the protocol specification, but I do have the c source for the Linux control terminal which drives the communication and would surely contain all that you need to know. It's just a terminal-based command line tool, so it should be simple enough to figure out how it ticks. We would have no reason to want to own the resulting driver, since lots of people may benefit from this added functionality.

Thanks,
-Mike

Hi Mike,

As far as protocols go, i'd agree that NMEA is one of the simpler ones. If we receive some additional requests for it we'll look at it more closely.

Serotonin Software is pleased to announce that components from Spinwave Systems (http://www.spinwavesystems.com) will be supported in the next release of Mango, expected before the end of April '07. Details will be available on the site shortly.