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AT Commands Reference Manual
+FIT - DTE Inactivity Timeout
This command specifies a DTE inactivity timeout value that allows the modem to break
away from an unsuccessful connection attempt at any stage of a facsimile transfer. The
DTE inactivity timer operates only while the modem is off-hook.
Syntax
+FIT=<time>,<action>
Defined Values
<time>
The <time> parameter indicates the DTE inactivity timeout in
seconds. The value of 0 indicates that timeout is disabled
(default). The required timeout range is 1 to 255 seconds. The
inactivity timer starts when the modem has taken some action
that requires DTE response. If the DTE does respond, the
modem resets the inactivity timer. Inactivity timer related
events are listed in Table 4-3.
<action>
The <action> parameter has two meanings.
0
Upon timeout, the modem will go on-hook,
executing an implied ATH command; then reset
to +FCLASS=0.
1
Upon timeout, the DCE will only go on-hook.
Reporting Current or Selected Values
Command: +FIT?
Response:
+FIT: <time>,<action>
Example:
+FIT: 0,0
For the default settings.
Reporting Supported Range of Parameter Values
Command: +FIT?
Response:
+FIT: (<time> range), (<action> range)
Example:
+FIT: (0-255),(0-1)
Table 4-3. Inactivity Timer Start and Stop Events
On-line state
Waiting for a command
Waiting for transmit data
Start timer event
modem sends final result code
modem sends CONNECT after
+FTM or +FTH command
Stop timer event
DTE sends AT or “at”
DTE sends data
Waiting for transmit data
modem sends <XON> or sets CTS ON
DTE sends data
Waiting to deliver
received data
modem sends <XOFF> after +FRM or
+FRH command
DTE sets V.24 Ckt 133 OFF after
+FRM or +FRH command
DTE sends <XON>
Waiting to deliver
received data
4-16
Conexant
DTE sets V.24 Ckt 133
ON
100722B