Btw, i was trying to implement the same function but i'm getting a hard time understanding how the ST language works. Is the any ST language documentation besides the one on help?

For example i'm having a issue (probably related to includes) where i'm trying to use Lib.Core.V1_0.B99_PCTimeNode.Wday and i get the message the variable 'Wday' can't be accessed from the current scope.

Thanks

Oh ok, thanks.

Hi,

After searching in help i've found some boxes that i would like to use in my project such as the T41. When i try to add it, it doesn't show in the list despite having the library in the references (in this case Lib.Hvac). I've searched through files.unipy.technology but i was unable to find another version of this library.

What am i doing wrong?

Thanks

Ok i can see now. Thanks

Oh ok. One point that i didn't understood correctly is how we can make that mapping. In order to acomplish that i should interact with the TCP Modbus server and present to it a new device is that it?
If i understood correctly is there any documentation that you can point?

Thanks

Hi,

Is there any way to set and get the variables defined in Mervis through Evok? Let's say i have a script that gets some data and would like that my mervis program acts upon that data. Can i use the Evok API in order to set some variable to the value that i get from the script? Or is this possible in any other way?

Regards

Hi again,

With a little bit of trial and error and some reading i finally manage to fully understand what both of you were saying, thanks again :)

In order to help people in the future I'll leave the required steps in order to read data in Mervis from a IME Conto D2 using the RS-485 on a Unipi:

• Set the IME meter communication parameters to 19200 baud rate, 8N1
• Read 2.8.3 from https://files.unipi.technology/s/public/download?path=%2FSoftware%2FMervis%2FDocumentation&files=Mervis Step-by-Step Manual.pdf as mentioned by @tomas_hora
• Set the UART_config initial value to 14 (Check the Mervis step by step manual in order to understand why)
• Create a Modbus channel and set:
  • Link Protocol to Serial
  • Integration mode to True
  • Max. Telegram Duration 125ms
  • Max. Telegram Duration (Commissioning) 500ms
  • Port Number Modbus.Neuron.XXXX:RS485
  • Baud rate 19200
  • Data Bits 8
  • Parity None
  • Stop Bits One
• Create a Device in the newly created channel
• Set the Device Address in the Modbus device parameters (this should be set to the same address as the one set in the meter, in my case address 1)
• Create a new group in the newly created device
• Set the following parameters in the Modbus Group Parameters
  • Starting Element to 8193 (should be 8192 which is 0x2000 in hex but Mervis some how sends 0x1FFFF maybe some bug?)
  • Function to F03 Read Holding Register
  • Number of elements to 16
• After this you have to map the variables according to http://www.imeitaly.com/protocolli/PR121.pdf, as example i'll leave how to do it for the voltage
  • Add I/O
  • For the new IO set:
    • Group to the group you've created earlier
    • Comm. Value Mapped Type - Builtin
    • ST Type - dword
    • Transform - Linear
    • Parameter K - 0.001
    • Data Offset - 0
    • MultiByte length - 4
    • MultiByte Order - 1234
  • For the other parameters just check the previous document and change the Data Offset and MultiByte length accordingly.

If you run into trouble check the @Giamba last post, use Port Monitor in debug mode to check whats wrong.

Hi @Giamba and @tomas_hora,

Thank you both.

With both of your inputs i can now understand how to do it. I've overlooked that document, didn't noticed the part of the RS485/Modbus.

Thanks :)

Hi @Giamba,

Thanks for the reply. While reading your reply i've noticed i forgot to mention that i'm using a Unipi Neuron L203 which has a RS-485 built in sorry about that :s
If i understood correctly o should present the device i'm reading data from (using my python script) to the modbus server? So that mervis then can read from it?

Regards

Hi,

I've managed to create a python script to interact with a power meter using RS485. I can't seem to find how to configure the protocol used in the RS485 communication in Mervis. Can someone point me to some resources where i can learn how to do this?

Thanks in advance