Revision as of 05:46, 20 November 2009 edit Reswobslc (talk \| contribs) 3,364 edits m →As used on serial mice: missin gheader ← Previous edit		Revision as of 06:15, 20 November 2009 edit undo Reswobslc (talk \| contribs) 3,364 edits →DTR configurability on modems: explain TR indicator on external modems Next edit →
Line 21: Many modems, especially older ones, have DIP switches that define the default DTR behavior when the modem is powered on or reset. 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 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. ==As used on null modem connections==

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