S121 - Use of DTR

Description
Register S121 selects how the time indicated by the value of S25 affects the recognition of changes in the state of DTR. A value of 1 allows the modem to be used with a system that does not provide a DTR signal.

Type
value

Value range
0-1, Default value: 0

Stored by &Wn
yes

Displayed by &V
no

Values
0 - Normal DTR state and state change behavior as defined by &Dn commands.
1 - If DTR is off, it is ignored (does not need to be on to maintain a connection). If DTR goes from off to on, it is ignored. If DTR goes from on to off, obey &Dn command. This value does not inhibit autoanswer.

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