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How do I set the state of the DTR line on COM1 in Labview PDA?

How do I set the state of the DTR line on COM1 in Labview PDA?  There are VIs for reading and writing data, but I don't see one for setting handshaking lines independently. 
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Hello,

Please see if this thread is helpful.

Good luck and best regards,
Shakhina P.
Applications Engineer
National Instruments
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Thank you.  Yes, that works well.  I can turn the DTR line on or off by setting "Input Alt. HW Hdshk" to True or False.  I wouldn't want to power a device that way.  Luckily I'm just using it as an enable line for my device. 
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