Accesing variable value from protcol

[ikkefc3]

Hi all,

I want to use a variable value component to write a command and a (voltage) value to my serial device.

I mad a new protocol for that. Sending static values in the command string from the protocol works ok, but I of course want to send the variable value from the component.

At the action tab of the component I have set "action" to the Set To mode.

My question is: How can I acces this "Set To" value in my device protocol? What is the variable name (or handle) it sends when you click the variable value component and change the value?

[AzeoTech]

Did you create an actual protocol driver, or just write a sequence?  It is often easier to just create a sequence unless you plan on reusing the code across many applications.  If you did a protocol driver,  probably the easiest thing to do is put that code into an output I/O type, then create a channel with that I/O type.  Then you can use the SetToValue variable in your script to set the appropriate value.  In the screen component you would set the Set To Channel to a channel you created with that I/O type.  See section 15.2.2 in the user's guide.  Feel free to post or email what you have so I can give a more detailed answer.

[ikkefc3]

On 9/26/2018 at 6:57 PM, AzeoTech said:

Did you create an actual protocol driver, or just write a sequence?  It is often easier to just create a sequence unless you plan on reusing the code across many applications.  If you did a protocol driver,  probably the easiest thing to do is put that code into an output I/O type, then create a channel with that I/O type.  Then you can use the SetToValue variable in your script to set the appropriate value.  In the screen component you would set the Set To Channel to a channel you created with that I/O type.  See section 15.2.2 in the user's guide.  Feel free to post or email what you have so I can give a more detailed answer.

Firstly, thank you for replying so quickly!

I created a new ddp file for this. It has an I/O type in it called setVolt, which is a numeric output.
In the function I have:

private string dataout = "VSET1:" + DoubleToStr(VoltValue)
private string datain = Poll(dataout,10)
return(StrToDouble(datain))

I want have a variable value-field on my dashboard with an action set to.

My question is: how do I get the "Action -> Set to" value into VoltValue in the code above? As I understand from your answer, I should name VoltValue in my code SetToValue

I must admit that I solved it in the meantime by creating seqeunces, but I think making a protocol would be nicer.

[AzeoTech]

Yes, you should, and then you should create a channel with this setVolt I/O type.  Finally have the Set To action of your control change the channel you just created.