break in series on the com port does not work

Hello everyone:

I have the following problem:

I am writing a command via the ' 'entry visa' vi on my pc com port. in some cases the com port do not return anything. This means that my "visa read" vi would timeout. the problem is that, later, I need to send more orders but must break the line in order to be able to do. I inserted the "breach of visa" vi but didn't have the reaction I was expecting. the line does not break. I tried to increase the duration of the break, but that does not work either.

Any ideas?

By using LabVIEW 2013

A break will not break the connection, it will just a 1 to the Tx line for a period longer than 11 baud (?) or specified length.

A hardware check that the breakdown is send: connect a scope or a DMM TX and GND, a 500ms break must be clearly visible even on a "slow" DMM (k resistance 10 and two LED antiparrallel or RS232 minitester practice would do the same job )

Tags: NI Software

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