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По ключевым словам Port, port access, i/o на эту ссылку действительно не выйти, но помогло тривиальное serial.
PS. Не делай добро - не получишь зла.
How can I control the DTR and RTS serial lines?
Serial Port Init.vi can be used to configure the serial port for hardware handshaking; however, some applications may require manual toggling of the DTR and RTS lines. Because the interface to the serial ports is platform-dependent, each platform has a separate mechanism to control the lines.
Windows
The LabVIEW for Windows distribution contains a VI which you can use to drive the DTR and RTS serial lines. The VI serial line ctrl.vi, located in vi.lib\Instr\_sersup.llb, can be used to control these lines. The VI will toggle these lines according to the function input. Valid codes for the input are:
0 - noop
1 - clear DTR
2 - set DTR
3 - clear RTS
4 - set RTS
5 - set DTR protocol
6 - clr DTR protocol
7 - noop2
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