VISA byte count

[quimper]

In a vi, I am using VISA write to check the byte count at port (I send 32 to VISA write).

When I was in LV 6.1 I did not have any issue. I am now working on LV 7.0 and sometimes I did have 10 bytes at port instead of 8 expected. This is a RS232 connection.

Since I am doing a loop to check that it is 8 bytes, it is then failing.

[SanaaT]

Hello Quimper,

If you use the same program without any modification, you should receive the same response.
Just be careful because the VIs like "Serial Port Write" and "Serial Port Read" do not exist any more in LabVIEW 7.
That's why, I suggest you to use VISA functions.

Regards,

Sanaa T
National Instruments

[Ray.R]

Hi quimper,

Are you sending or receiving control characters? such as '\r\n', for instance?

Ray

[quimper]

Hello Ray,

I do not receive control character, I am only receiving a frame.

regards,

Quimper.

[quimper]

Hello Sanaa T and Ray,

I have finally resolved the issue thanks to your help: This is in "Configure serial Port" vi: I put "Enable termination Char" to false (true by default).

I though that I was only receiving data frame from the interface board I am using, but obviously, this is not the case.

Now, the byte count is correct and do not see anymore failures.

Thanks again for your help, I very much appreciate it.

Regards,

Quimper.

[Ray.R]

Hi quimper,

Thanks for your reply.  I was thinking about this yesterday and picking my brains at what else it could be 😉

Glad to read that you solved it.  😄

Happy New Year!

Ray