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Should I Use Null Modem or Straight Through Serial Cables? - NI
Null Modem cable
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Null modem - Wikipedia
Null modem cable
FTDI Chipset Cross Wired USB Serial DB9 FT232R USB RS232 Cable de módem nulo Cable de TV de control (estándar DB9 COM puerto pinout (pc(host) con USB a RS232 dispositivo terminal (esclavo)) :