B-2 APPENDIX B: ALPHABETIC COMMAND S UMMARYWith the exception of the Dial options, modems ignore any commandsissued after D in the same command string.Bn Set handshaking options.B1 Bell answer tone. This setting selects HSTmodulation, but use it only if the modem isnot required to answer V.34-type calls.Cn Enable or disable the transmitter.C0 Transmitter disabled; for receiving only.C1 Transmitter enabled.Command FunctionDn Dial a phone number and issue other optional commands.The numbers 0-9 are accepted. The maximum number ofcharacters 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 inS-Register 8). Accepted but ignored.; (Semicolon) Remain in Command mode afterdialing." Dial the letters that follow.W Wait for a second dial tone before continuingdialing (with X3 or higher). Accepted butignored.@ Wait for an answer (with X3, X4, or X7).Accepted but ignored./ Pause for 125 milliseconds. Accepted butignored.R Reverse frequencies. Use this commandwhen calling an originate-only modem. Itforces the modem to dial out at the answerfrequency.Command Function
