AT command

Description

AT A

ANSWER. Accepts an incoming call that has been indicated by a "RING". If the S0 register is set to zero, TTY indicates a RING until the call is answered by the AT A command or released.

AT D[T|P]<number>

DIAL. Dials the given number. Dial tone (T) or dial pulse (P) are ignored. <number> can have the following format: <CalledPartyNumber>[| <Subaddress>][^56k][+i<y> | +p=btx] where <y> is the Diva-specific +I command (see below).

AT E[0|1]

<n>

Echo mode. In echo mode, the commands sent to the modem are echoed back to the terminal.

0

Echo mode OFF. In command mode, the modem does not reflect the data that it has received from the application back to the application.

1

Echo mode ON. In command mode, the modem reflects the data that it has received from the application back to the application.

AT I[<n>]

INFO. Returns the modem identification string. <n> : integer ranging from 0 to 9

AT H[0]

HANGUP. Disconnects the line.

AT O[1]

ONLINE. Switches the modem from command mode to data mode.

AT Q[<n>]

<n>

Modem response mode

0

Returns result codes (default)

1

Quiet mode. In quiet mode the modem driver does not return result codes for the commands.

AT V[<n>]

<n>

Modem response (result code) format

0

Numeric result codes.

1

Plain text result codes (verbal mode, default).

AT L<n>

Command accepted for compatibility reasons.

AT N<n>

Command accepted for compatibility reasons.

AT M<n>

Command accepted for compatibility reasons.

AT Y<n>

Command accepted for compatibility reasons.

AT X<n>

<n>

Result code reporting option

0

Enables minimum information only (plain CONNECT in case of successful connection establishment, NO CARRIER in case of dialing/answer error).

4

Enables full information (the result codes are reported, default).

AT Z[<n>]

Soft reset. Drops the connection if the modem is in ESCAPE mode. Resets the modem and restores the selected predefined modem configuration profile <n>. See Supported TTY profiles for more information. See AT&F below for the list of predefined modem configuration profiles.

AT S<r>=?

Displays the value of the selected S-register <r>.

AT S0=<n>

<n>

Description

0

Disables auto answer. Incoming calls are answered with an ALERT message and indicated by RING messages (every 4 sec). The user can investigate the call parameters, select the appropriate profile or settings and accept the call by the AT A command. The user can issue the AT H command to reject the incoming call.

1 ... 254

Enables auto answer. Incoming calls are indicated by a RING and accepted automatically.

255

Ignores the incoming calls (default).

ATS2=<n>

<n>
(0 ... 255)

Description

127

Disables the escape sequence process, i.e. no escape character is recognized.

43

The default value of the ESCAPE character ("+").

ATS7=<n>

Default value is set to zero (e.g., modem will use protocol-specific default value).

Modem mode: time to wait for carrier. Sets the time in seconds that the modem will wait for a carrier before hanging up. <n> is a range from 0 to 255 seconds.

Fax mode: time to wait for connect. Sets the time in seconds that fax will wait for connection before hanging up. Suggested value is 200 seconds. Values less than 10 seconds are ignored. The carrier waiting time starts after the connection was established and is set to 60 seconds.

ATS9=<n>

Carrier Detect Response Time. Sets the time in tenths of a second that a carrier must be present before the modem considers it valid. <n> is a range from 0 to 255 tenths of a second. This register is only implemented for compatibility reasons. Writing to this register does not affect the Carrier Detect Response time.

ATS10=<n>

Delay between carrier loss and hang up. Sets the time in tenths of a second that the modem waits before hanging up after a loss of carrier. <n> is a range from 0 ... 255 tenths of a second.

ATS27=<bitmask>

Bit

Value

Result

0

1

Reserved

1

2

Reserved

2

4

Reserved

3

8

Disables 2100 Hz answer tone

4

16

Reserved

5

32

Reserved

6

64

Reserved

7

128

Reserved

ATS51=<bitmask>

Bit

Value

Result

0

1

Disables error correction for 1200 bps connections

1

2

Disables error correction for V.22bis connections

2

4

Disables error correction for V.32bis connections

3

8

Reserved

4

16

Reserved

5

32

Reserved

6

64

Reserved

7

128

Reserved

ATS91=<bitmask>

Bit

Value

Result

0

1

Use reverse SDLC establishment (SNRM sent by answerer and not by caller). Mandatory for POS.

1

2

Poll on each SDLC frame. Required by some POS terminals.

ATS92=<n>

SDLC Address A (default 0x30)

ATS128

S-register 128 is a read-only register. Reading this register allows to retrieve information on the current (last) incoming call. It returns a message in the following format: ;<calling party number>;<destination_address>. If calling party or destination sub- addresses are present, they are separated by a slash "/" from the called party number or the destination address. For example, the calling party number 800, calling party sub-address 900, destination address 400, destination sub-address 500 are presented as: ;800/900;400/500.

ATS172=<bitmask>

Bit

Value

Result

0

1

Enable transmission and reception of empty frames.

1

2

Enable "multimoding", i.e. a trailing byte (modulation tag) in every frame specifies which modulation has to be used to send this frame or at which modulation it was received. Valid modulation tags are 0x27 for V.23 HDX off hook and 0x28 for V.23 HDX on hook.

2

4

Shield empty frames. This mode enables a tty application to send and receive empty frames. Since a frame with a length of 1 byte is invalid in the V.23 SMS and V.23 Caller ID protocol, it is used to carry the information that an empty frame occurred and which modulation was detected. The data byte in a real 1 byte frame is replaced by a unique value 0xff. A single byte frame 0x27 indicates or issues an empty frame in V.23 HDX off hook. A single byte frame 0x28 indicates or issues an empty frame in V.23 HDX on hook.

ATS253=<n>

<n> (0 ... 127)

Description

Set

Write allows to set coded in accordance with Q.931 cause value to be used to disconnect this call (for example by ATH/ATZ commands or by DTR drop operation). The Dialogic^® Diva^® Media Board provides conversion between used national dependent values/in band procedures and Q.931.

Read

Read after disconnect provides coded in accordance with Q.931 value of disconnect cause. The Dialogic^® Diva^® Media Board provides conversion between used national dependent values/in band procedures and Q.931.

ATS254=<bitmask>

Bit

Value

Result

0

1

Allows to reject incoming call using ATH, ATZ commands or using DTR drop procedure.

1

2

Activate TIES (Time Independent Escape Sequence). The TIES procedure switches to command mode if "+++AT<CR>" (where <CR> represents hex digit 0x0D) sequence is detected in the data stream after a 20 ms pause and is followed by a 40 ms pause.

ATS1001=<number>

Second origination address. This number is placed as the second origination address.

ATS1002=<number>

Specifies the numbering plan identifier for the second origination address. Number should be in the range 0...255. If number is set to 128 or larger then octet 3a (presentation and screening indicator) is not used.

ATS1003=<number>

Specifies the presentation (bits [7:6] in octet 3a of origination address) and screening (bits [2:1] in octet 3a of origination address) for the second origination address. Number should be in the range 0...127.