Revision as of 19:15, 26 February 2014 edit LilHelpa (talk \| contribs) Extended confirmed users, Pending changes reviewers 413,966 edits m Typos and general fixes using AWB ← Previous edit		Revision as of 21:59, 31 March 2015 edit undo Jeh (talk \| contribs) Extended confirmed users, Pending changes reviewers 19,611 edits →Signaling for modems: software signaling as an alternative is irrelevant to the DTR signal. Article is about DTR Next edit →
Line 5: ==Signaling for modems== The DTR signal is an important call control signal for a data modem. Dropping DTR from high to low for at least two seconds tells the modem to disconnect (end) a call or data connection. ~~===Software signaling===~~ A call may also be disconnected by in-band signaling in software with ''escape codes'' to activate the modem's [[Command and Data modes (modem)\|command mode]], typically "+++", followed by other modem commands to disconnect, e.g., the hangup command ("ATH" per the [[Hayes command set]]). When a modem is being used for automatic answering (such as with the command ATS0=1), the DTR signal confirms to the modem that the computer is available to accept a call. In their default configuration, most modems do not answer calls if the DTR signal is low, even if auto-answer mode is enabled.

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