VISA, Continuously read data when available.

[nik35324]

I have pressure measuring device which reads the pressure periodically and sends information every 250ms. I would like to read the data for about one and half hour or even for some more time. I wrote 2 programs for this operation

1. VISA Read and write every 250ms: Here I configure the settings then write and read data every 250ms. (This fails after some time).

2. VISA using events.

I have attached the  both programs. Would you suggest which one is appropriate for this operation or any further suggestions, improvements???

Thank you.

[Dennis_Knutson]

I'm posting from my phone so I can't view the VI.

What error do you get? If the instrument appends a termination character, all you should need is a VISA Read with some arbitrarily high byte count. No VISA Bytes at Serial Port, no events, and no wait.

What are you doing with the write?

[nik35324]

Error message is : -1073807339.

I found out that there is no need of VISA write. As soon I open the VISA port and set the port configuration the data is available on the interface.

I did even tried the example from ni here and I have the same error.

[crossrulz]

A timeout error implies one of two possible issues:

1. Your instrument does not constantly send out data

2. You are using the wrong termination character.

[nik35324]

@ crossrulz : Do you think that 2nd attached is wright?

What is the difference between the Serial Character and Serial TermChar  for the input: event type?

[crossrulz]

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nik35324 wrote:

What is the difference between the Serial Character and Serial TermChar  for the input: event type?

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The Serial Character just means that something can into the serial port.  The Serial TermChar means that the Termination Character was found in the serial port.

[nik35324]

@ Dennis_Knutson , crossrulz : Thank you guys for your support. I was using the wrong terminating character. Now, the issue has been solved. 

[preet_singh]

can you give me code compatible for labview 2010

thanks