B-2APPENDIX B: ALPHABETIC COMMAND SUMMARY

Command

Function

Bn

Set handshaking options.

 

B1

Bell answer tone. This setting selects HST

 

 

modulation, but use it only if the modem is

 

 

not required to answer V.34-type calls.

 

 

Cn

Enable or disable the transmitter.

 

C0

Transmitter disabled; for receiving only.

 

C1

Transmitter enabled.

 

 

 

With the exception of the Dial options, modems ignore any commands issued after D in the same command string.

Command

Function

 

 

 

Dn

Dial a phone number and issue other optional commands.

 

The numbers 0-9 are accepted. The maximum number of

 

characters allowed is 36, including the AT prefix, punctuation,

 

and spaces.

 

 

Optional parameters:

 

 

 

 

P

Dial using pulses. Accepted but ignored.

 

 

 

 

T

Dial using tones. Accepted but ignored.

 

 

 

 

,

(Comma) Pause for 2 seconds (or the time in

 

 

S-Register 8). Accepted but ignored.

 

 

 

 

;

(Semicolon) Remain in Command mode after

 

 

dialing.

 

 

 

 

"

Dial the letters that follow.

 

 

 

 

W

Wait for a second dial tone before continuing

 

 

dialing (with X3 or higher). Accepted but

 

 

ignored.

 

 

 

 

@

Wait for an answer (with X3, X4, or X7).

 

 

Accepted but ignored.

 

 

 

 

/

Pause for 125 milliseconds. Accepted but

 

 

ignored.

 

 

 

 

R

Reverse frequencies. Use this command

 

 

when calling an originate-only modem. It

forces the modem to dial out at the answer frequency.

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3Com 56K manual Optional parameters