&Dn - Select Data Terminal Ready Option
Command Line Format
AT [cmds] &D [suffix] [cmds] <CR>
Suffix Values
0 through 3
Default
&D0
Stored by &Wn
yes
Displayed by &V
yes
Description
The &Dn command controls how the modem responds to the state of DTR
and changes of DTR. The effects of DTR states and changes are also dependent
upon the current communication mode (&Qn or &Mn command). The test modes
associated with certain &Tn commands are only affected by DTR changes when
&D3 is in effect and are not affected by &Qn or &Mn commands.
The TR LED shows the state of DTR except when &D0 and &Q0 are in effect.
Note that TR may have special uses in certain test modes.
Select one of the following topics for a description of what DTR does for
each mode of modem operation.
Dumb, switched
Smart AT, switched
Dumb Leased Line
Timing of DTR Off-To-On Transitions
Timing of DTR On-To-Off Transitions
DTR-Initiated Hard Reset (&D3 in effect)
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