Can a Serial Port Output a Static High?

Updated Jul 18, 2018

Reported In

Hardware

  • Serial Interface Device

Driver

  • NI-Serial

Issue Details

I am hoping to use my National Instruments Serial device to output a static high, similar to a digital I/O card. Is this functionality that is possible?

Solution

This is not possible due to how serial communication works. A serial message includes values outside of the data word itself, like stop bits and start bits, that would prevent the signal from being only high or only low. 
 
 

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