What is a material interfering?

Hello

I worte a program (see attachment) in order to acquire data from two instruments (RS232) serial ports - one is a force sensor and another is a position sensor. When I connect these two instruments directly on my desk by RS232, the data seemed fine. But when I connect these two instruments to the USB ports on my laptop, RS232-USB adapter, there was so much noise for two data. Someone told me it was due to the interference of material. Since I know little about the equipment, could someone please tell me if this is really a material interfering or problems with my code? Why it worked well on desktop and is it possible to fix it? Thank you very much!

Your code looks fine with one exception.  You must convert error hydrants at the border of the loop of shift registers.  In this way, any error that occurs will be propagated to the next loop.  The way you have it, if an error occurs, it will be lost on the next iteration of the loop and you will never know about it.

You aren't the first person who complained USB converters series spoil their program.  The only suggestion I have is to come back to the serial port, or maybe buy another brand of USB-serial converter.

Edit: Just noticed you don't have any waiting funtion in your loop.  This will cause 100% CPU usage, and maybe that's what's causing your problem because the OS isn't time to take care properly to the USB port.  It's just a guess.  Put in a small delay (hold function), e.g. 10 ms.  See if that solves your problem.  Even if it isn't, keep the delay in there.

Tags: NI Software

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