Technical data

2 Turns 1800 Hz guard tone on.

AT &D[<n>] Data Terminal Ready (DTR) options. <n> ranges from 0 to 3. See AT&Q command below.

AT &Q[<n>] Communication options. <n> ranges from 0 to 3. Data Terminal Ready (DTR) options and

Communication (COM) options determine the behavior of the virtual modem when DTR switches

from ON to OFF in accordance with the following table:

&Q &D0 &D1 &D2 &D3

&Q0 N [a] B C D

&Q1 A [b] B [c] C [d] D [e]

&Q2 C C C D

&Q3 C C C D

<n> Terminal flow control options. Defines the flow control mechanism.

0 Disables flow control.

1 Enables RTS/CTS local + remote flow control (obsolete).

2 Enables XON/XOFF flow control (obsolete).

3 Enables RTS/CTS local + remote flow control.

4 Enables XON/XOFF flow control.

5 Enables transparent XON/XOFF flow control.

AT &K<n>

6 Enables both XON/XOFF and RTS/CTS flow control (voice).

AT &V Displays the current configuration, the last number that has been dialed (last DIAL to), and the

calling party number of the last incoming call (last RING from).

AT &V1 Displays current settings and settings of the available profiles.

AT &F[<n>] Resets the modem and restores the selected predefined modem configuration profile. AT&F sets

factory defaults for current profile. See Supported TTY profiles on page 52 for details.

Notes:

[a] No action is taken, the DTR drop is ignored.

[b] If the modem is online, it hangs up and responds with OK.

[c] If the modem is online, it switches to command mode (as if an ESCAPE sequence was detected) and sends

OK.

[d] If the modem is online, it hangs up and responds with OK.

[e] If the modem is online, it hangs up and the current profile defaults are restored.