AT Commands

A/

Repeat last command

 

This command repeats the last command string entered. Do not precede

 

this command with an AT prefix or conclude it by pressing ENTER.

A

Answer command

 

This command instructs the modem to go off-hook and answer an incoming

 

call.

 

Bn

Communication standard setting

 

This command determines the communication standard CCITT or Bell.

 

B0 Selects CCITT V.22 mode when the modem is at 1200 bps.

 

B1 Selects Bell 212A when the modem is at 1200 bps (default).

 

B15 Selects V.21 when the modem is at 300 bps.

 

B16 Selects Bell 103J when the modem is at 300 bps (default).

 

Result Codes:

 

OK

n=0,1,15,16

 

ERROR Otherwise

Dn

Dial

 

 

This command instructs the modem to dial a telephone number. Enter n

 

(the telephone number and any modifiers) after the ATD command.

 

Any digit or symbol (0-9, *, #, A, B, C, D) may be dialed as touch-tone

 

digits. Characters such as spaces, hyphens, and parentheses do not count.

 

They are ignored by the modem, but you may want to include them to make

 

the number and modifiers easier to read.

 

The following may be used as phone number modifiers:

 

P

Pulse dialing.

 

T

Touch-tone dialing (default).

,Pause during dialing. Pause for time specified in Register S8 before processing the next character in the dial string.

WWait for dial tone. Modem waits for a second dial tone before processing the dial string.

@Wait for quiet answer. Wait for five seconds of silence after dialing the number. If silence is not detected, the modem sends a NO ANSWER result code back to the caller.

!Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return to off-hook.

;Return to command mode. Causes the modem to return to command mode after dialing a number, without disconnecting the call.

S=n Dial a telephone number previously stored using the &Zn=X command (See &Zn=X command for more information). The range is 0-3.

User’s Manual

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