The computer hangs during the communication via a serial port

I developed a code in LabVIEW 2011 to connect with the XY stage. It's actually two steps mounted perpendicularly. The installer of the system is that a (made by the same manufacturer as the stadium) gamepad is connected to the USB port on the computer if a USB to Serial converter. A step is daisy chanied to the controller and the other stage Garland at the first stage.

To our application had to continually check the status and position of the steps X and Y. Because the joystick also returns responses when a request is sent to all devices, I need to send applications individually; for example. one request per order per device, making it a total of 4 orders. It takes care of the error returned by the controller. The problem, however, is that after a while the freezing of the program or the computer stops and restarts. It is located about 13 minutes (on average) after the start of the program. It also happens even when no command is sent to the devices. I put 50 ms delay before each send two commands (position and status) by device. Basically, the application waits for 50ms before sending two commands for X stage and the receipt of the response and when everything is done with X stage, he expects another 50 ms to do the same for step Y. Should this procedure goes on until the application is stopped. But as I said, there is a problem. Now, I guess the problem is that serial port buffer overflows. He chose to increase the delay time, but if it works to solve the problem, then I have no choice!

I would appreciate any thoughts and comments!

After a lot of time to experiment, I am convinced that the issue was with adapter Profilic.

Tags: NI Software

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