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Chapter 4 – Voice Commands
+VIT
Description:
Syntax:
Values:
Result Codes:
Reports:
Set DTE/DCE Inactivity Timer
Sets the modem's initial value for the PC/Modem Inactivity Timer. The units are in 1.0
seconds. The PC can disable the Inactivity Timer by using a value of 0 (+VIT=0).
The Inactivity Timer serves to ensure that the PC does not leave the modem in a
state where it is not accessible by voice-unaware software. The Inactivity Timer is
activated when the PC selects the voice fixed-rate. The timer expires if the flow of
data from the PC to the modem stops (in both Voice Command mode and Data
mode) for a specified amount of time.
When this timer expires, the modem switches to Data mode with autobauding. By
switching to autobauding (and Data mode), the PC is allowed voice-unaware
software to recover control of the modem in the event of catastrophic failure that does
not result in a modem power down. It is recommended that the PC software leave the
modem in autobauding (and Data mode), and use the Inactivity Timer only as
needed. Leaving the modem in autobauding is an extra measure to prevent
confusion from voice-unaware software accessing the modem in Voice mode at a
fixed PC/modem interface rate. You can use the H command to switch to
autobauding and Data mode automatically. In Voice mode, the modem does not
allow the auto answer feature, since this feature does not allow the PC to set the
modem in Voice mode before answering the phone.
AT+VIT=<timer>
<timer>
0 Disables the timer. Default.
0-255 Timer set in units of 1.0 seconds.
OK if <timer> = 0-255.
ERROR if the parameter is out of range or if not in voice mode.
+VIT? Displays current or selected values.
+VIT=? Displays list of valid values supported.
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
48
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