com'x 510 and PM5310 individual harmonic logging Question

[gibson_huang_ep]

I want to use the Com'x 510 to connect the PM5310 METER, i create the new device pm5310 , but  i want to log the individual voltage and  current harmonic , but  can't show this item , just THD.

so, i go to create the custom libary , i find the pm5310 individual mapping address and create . but commucation always error. 

someone can help me please. thanks

[Randi_Dolan]

Hi,

When creating a custom model, you need to enter the Modbus address, not the Modbus register.  The Modbus address is the Modbus register - 1.

I hope this helps.

Randi

[gibson_huang_ep]

Hi Randi:

thanks , but i use the dignostic funtion  read the register ,  for the example , i want to read PM5310 A-N voltage THD ,Register is 21330 , the individual it can be read sucessful , no problem

but  i create the custom library , i modify the frame , start address , you means i should key in  21329 (21330-1) , maybe works right ?  

[Romain_Polette]

Hello @gibson_huang_ep 

I confirm. Register = Modbus Address + 1

For PM5300 serie, THD  Voltage A-N register is 21330.

The embedded Diagnostic Tool of the Com'X is working with the Register number. So in this case if you read 21330 you will have a goof value.

But if you want to create a Custom Model (for any device) => you need to enter the Modbus Address of the Register (and not the register itself).

A Modbus Frame is always composed of the Address of the Register. 

A good example is to create your PM5310 Model based on the Existing PM5320 Model. you will see the differences.

Regards,

Romain

[gibson_huang_ep]

Hi @Romain_Polette :

thanks for the useful reply , i can use cutom library to read the modbus address , but the value is weird, in that time nornally the VTHD a-n is between 18%-30% , but the com'x 510 show -2695,977,546,809,344,00 , as the picture as below.

please  teach  me , how to adujust the parameter to display correct value . thanks again.