![]() ![]() ![]() Simple Straight Through CableĪ straight-through or "one to one" cable is used to connect a DTE device (PC) to a DCE device (modem or other communications device). ![]() DTE normally refers to the serial port on a PC or terminal, while DCE refers to a modem or other type of communications device.ĭepending on the type of device on each end of the line, you either need a straight-through or a null-modem ("crossover") cable in order to communicate. The RS-232 specification defines two types of serial devices, DTE and DCE. Straight Through Serial CableĬrossover or "Null Modem" vs.
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