VISA series: setting State of DTR and RTS to "Unasserted" has solved the problem of communication RS232; Why?

In recent days, I struggled to get a pair of linear actuators Zagarella to work with LabVIEW after upgrading a computer and LabVIEW. The Zabers communicate via the serial port (RS232), who has perfectly worked on the old (but deceased) XP computer with LV 8.6. With a Win7 PC with LV 2010SP1, this suddenly no longer works. To add to the puzzle, the native of the software provided by the manufacturer has worked correctly.

Using the Microsoft/SysInternals PortMon software, I could read in the serial communication (highly recommended debugging tool, btw). There were some differences between the native software and my LV software, so I tried a lot of things in LV to try to resolve the problem.

Ultimately, the change of the code which makes communication with the work of Zabers is shown in the image below. The part in the structure schema disable enabled correct serial with the Zabers; It breaks the deactivation of this code.

Now my question is: I don't have any idea why this would fix it. If I understand correctly, this property node manually off the DTR and RTS lines on the serial cable; It is common for devices like this is sensitive to these channels? I've been reading a bit on RS-232 communication, but someone here has a simple explanation of what could happen?

I thank very you much in advance!


Tags: NI Software

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