How can we set analogInput Value in runtime when a bacpypes instance is running

[snehabati]

Hi Joel, I am running one instance of bacpypes in PC1 as application and in another: PC2 I am running another instance and trying to read/write to PC1's object's properties. My use case is like below:

1. Set Analog Output's Present Value = 75.0
2. If Analog Output Changes to 75: set the Analog Input to 25 (Here is were I am stuck, how can we change the analog Input Value in this case. I am not talking about the write here I have to set the config and when I read analogInput presentValue I should be able to get 25 ) Can you please help.

[snehabati]

To add on to this what exactly I m looking for is a dynamically changeable property values in device(PC1) like how it gets changed in the real devices .

[JoelBender]

I'm not sure I understand completely. I think that you are asking for an Analog Output Object in PC1 (call it test_aout) to be "wired" to an Analog Input Object of the same application (call it test_ain). You will then be using PC2 to change the value of test_aout using the Write Property service, then using PC2 again to read the value of test_ain using the Read Property service to see that it has changed. Is this correct?

[snehabati]

what you have told is right, I want to change test_ain values(like a temp sensor value changes). Would like to know how to achieve this.

[SQ9MDD]

Hi snehabati

I think you can use this example for your problem: https://github.com/JoelBender/bacpypes/blob/master/samples/mini_device.py

1. On PC1 setup aplication with two objects inside: "test_aout" and "test_ain"
2. Inside "DoSomething" class set test.ain.presentValue = test_aout.presentValue (or another fancy code)
3. From PC2 using Yabe or another OWS set test.aout value and see what happend.

I use this example to read data from JSON server of the weather station. It works very stable