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DTR is a serial RS-232 control signal sent from data terminal equipment (DTE), e.g., computer equipment, to data communication equipment (DCE), e.g., a modem, signaling that the terminal is ready for communications and that the modem will activate the communication channel. The DTR signal is given on the DB-25 pin 20 and a pin 4 of a newer DE-9 serial port on the 22-wire RS-232 interface. The call (logical “1”) is affirmed by increasing the pin’s voltage from positive to negative. If the signal declines back to its negative state, the modem will mean that the contact session is ended.
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