Revision as of 06:38, 1 April 2015 edit Jeh (talk \| contribs) Extended confirmed users, Pending changes reviewers 19,611 edits →top: no, that would be logic "1". the relationship of polarity to bit values is opposite for control signals vs data ← Previous edit		Revision as of 09:56, 29 May 2015 edit undo 208.157.163.16 (talk) No edit summary Next edit →
Line 1: '''Data Terminal Ready''' ('''DTR''') is a [[control signal]] in [[RS-232]] serial communications, transmitted from a data terminal equipment (DTE), such as a computer, to a data ~~circuit-terminating device~~communications (DCE), for example a [[modem]], to indicate that the terminal is ready for communications and the modem may initiate a communications channel. The DTR signal is present on pin 20 of the 22-wire RS-232 interface using a [[DB-25]] connector, and on pin 4 of a newer [[DE-9]] serial port. The signal is asserted (logic "1") by raising the voltage of the pin from negative to positive. Dropping the signal back to its negative state indicates to the modem that the communications session shall be terminated.

Data Terminal Ready: Difference between revisions