Revision as of 05:49, 18 January 2014 edit Adavidb (talk \| contribs) Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers 126,410 edits m Disambiguate Hayes to Hayes Microcomputer Products using popups; formatting: whitespace (using Advisor.js) ← Previous edit		Revision as of 19:15, 26 February 2014 edit undo LilHelpa (talk \| contribs) Extended confirmed users, Pending changes reviewers 413,966 edits m Typos and general fixes using AWB Next edit →
Line 23: Many modems, especially older ones, have DIP switches that define the default DTR behavior when the modem is powered on or reset.<ref name="USR_Courier_Ch8" /> Newer modems use nonvolatile memory to hold this behavior, which can be manipulated with the AT&W command. Many external modems have LED indicators on the front, one of which is '''TR''' (''"terminal ready"''). This light follows the state of the DTR pin. The light is on when DTR is high, and off when it's is low. Modems will typically keep the TR light illuminated when the AT&D0 command is used to force the modem to ignore the DTR signal, regardless of the pin's actual state. ==Null modem operation==

Data Terminal Ready: Difference between revisions