AT command

Description

AT &C[<n>]

Accepted for compatibility reasons. <n> : any integer

AT &G[<n>]

<n>

Guard tone options

0

Turns guard tone off (default).

1

Turns 550 Hz guard tone on.

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:

AT &K<n>

<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.

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 for details.