Data Terminal Ready: Difference between revisions

Revision as of 11:10, 13 February 2010

Revision as of 04:39, 25 March 2010

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_{_{Subscript text}_{_{Subscript text}}}'''Data Terminal Ready''', abbreviated as '''DTR''', is a [[control signal]] present inside an [[RS-232]] serial communications cable that goes between a computer and another device, such as a modem. This is a one-way "high-low" signal going from the computer to the modem (or, in RS-232 terminology, "from DTE to DCE").

It is present on pin 4 of a [[DE-9]] serial port, or pin 20 of a [[DB-25]] port.