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MKS 946 Vacuum | Visa Read Problem

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Dear Community People,

 

I am using LabVIEW to get flow rate data from LabVIEW. I made an easy code(withoutwhile_loop.vi) using visa write and read. It reads the command. For example, for @253FR6?;FF it usually returns @253ACK-1.100E-2;FF. Here 1.100E-2 is my desired flow rate.

However I want to read this data continuously. So I used a while loop in 500ms wait time(withwhile_loop.vi). Now when I run the loop for each iteration, the read value is different. For example, for first iteration, it is @253ACK-1.100E-2, for 2nd iteration it is ;FF@253ACK-1.1, for others it is something else. I want the code to show in @253ACK-1.100E-2;FF format everytime so that after each iteration I can extract the value(For this case -1.100E-2).

Could anyone help me what I am doing wrong exactly?

I have attached both of the code. 

Additionally, how to find out what's the correct byte count?

 

Thanks. 


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