Jump to content

Venstar - Not all Venstar variables available via Nodelink..?


bipto

Recommended Posts

In migrating my programs to Nodelink, I noticed that some of the thermostat variables that I was using with Venlink are no longer available.  I'm looking specifically for the Outdoor Sensor and Filter Alert values which appear on the Nodelink Server device web page, but are not visible either on the node page or programmatically through ISY...

 

Have I somehow misconfigured, or have these values been omitted..?  The Outdoor Temp is of particular importance for us Dual Fuel Heat Pump guys as it allows us to customize staging times, etc. around the system's balance point.

 

Thanks!

--Bill 

Link to comment
Share on other sites

Bill,

 

You can run NodeLink and Venlinks side by side if that helps. Keep the variables and program lines that you need from venlink until they are included in NodeLink.

 

Paul

Thanks Paul!  Honestly I hadn't considered that, just jumped in to "noding" with both feet...  :-D   Not really a deal-breaker as I can just import outdoor temp from the Climate Module, but I think there is some benefit to having the HVAC system itself and the ISY use the same value, and Venlink accommodated this so I figured I'd ask... 

Link to comment
Share on other sites

 

Thanks Paul!  Honestly I hadn't considered that, just jumped in to "noding" with both feet...   :-D   Not really a deal-breaker as I can just import outdoor temp from the Climate Module, but I think there is some benefit to having the HVAC system itself and the ISY use the same value, and Venlink accommodated this so I figured I'd ask... 

 

Bill

 

I used them side by side when the runtime node was being created. I'm watching runtime to validate insulation work done earlier this year. I've since gone nodelink only too.

 

I get that accuracy matters and using one source of data. I like the climate module for forecast data, but looking at setting up local temp, humid, pressure and light to improve HA locally.

 

Paul

Link to comment
Share on other sites

  • 2 months later...

Hate to resurrect this thread but I have only a blank in the ISY device page for my T7900.

 

I also see no node for the external sensor temperature in the admin console for NodeLink v3.1

 

Do I have this correct, if I add an external sensor to my T7900, the temperature data will show up in NodeLink and on my ISY for logical decisions and triggering of programs?

 

Have I have interpreted this thread incorrectly?

Link to comment
Share on other sites

This thread had to do with NodeLink not having all the same features as VenLink, which is not the case anymore.

 

Yes, an external sensor would show up. Under the main Venstar node you should see a "Sensor" variable.

Thanks. Any idea of the resistance value to simulate a sensor?
Link to comment
Share on other sites

Google 10k sensor

Thanks io_guy!

 

Hooked up a rheostat to the sensor input and NodeLink suddenly appears with the node and a value for it.

 

One snag though. NodeLink does not update the ISY Node on changes to the outdoor sensor value. It only triggers an update to ISY when another parameter is changed.

 

After waiting 5 to 10 minutes, each test, I found if I changed a setpoint NodeLink updates that parameter as well as the outdoor sensor parameter in ISY.

 

 

BTW: I found +20 degrees C took about 12k25 on the resistor but my DVM has begun to not reset properly now so that may not be accurate. :(

15kOhm displayed +12.0 C on the T7900.

Link to comment
Share on other sites

I'm not seeing how that is possible since the indoor temp/humidity values are pulled from the same http get routine.  I'll add extra debug logging to the next release.

Thanks.

 

NodeLink gets the parameter from the T7900 OK, after it updates on the stat. I can see it on the NodeLink monitor webpage.

 

The sensor value update  isn't pushed into the ISY Rest variable until another value changes. Then both update simultaneously.

 

I am not sure of how the algorithm, that stuffs the ISY Rest parameters, works but it seems like the Sensor input value change doesn't trigger it.

Link to comment
Share on other sites

I'm having a tough time reproducing that.

All values are in the same loop.  They are supposed to be sent as soon as they change.  For you to see it change in NodeLink but not in REST is odd.

 

Try enabling the main verbose log (main page, not device) to capture the REST sends to the ISY.

Link to comment
Share on other sites

I'm having a tough time reproducing that.

All values are in the same loop.  They are supposed to be sent as soon as they change.  For you to see it change in NodeLink but not in REST is odd.

 

Try enabling the main verbose log (main page, not device) to capture the REST sends to the ISY.

I'll have to hook up my simulator again today and test more thoroughly as you suggest.

 

 

From the charts I have compared with the Venstar unit manual it appears the ColourTouch

requires a NTC 10K @ 25C,  Beta = 3435K sensor

From my calculations off the sensor manual it should be closer to aprox. Beta = 3300

 

 

Anybody have a good place to get an outdoor sensor more locally sourced? The Venstar unit looks like an electrical box mount and maybe not too weatherproof.

The stainless steel probe types on eBay look good and cheap but the China sourced waterproof probes  always take so long to ship across the big pond.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.


×
×
  • Create New...