2400 BPS Internal Faxmodem (250-3532) Dialing Faxback Doc. # 4890 Dial Command (D): D is the dial command. You can enter several other associated commands as part of a dial command. In its simplest form, you follow the dial command with the number you want the modem to dial. ATD 555-8900 Your modem dials the number and waits 30 seconds (default) for a response. If the other modem answers, your modem sends the CONNECT, CONNECT 1200, or CONNECT 2400 result code, depending on the other modem's speed. Your modem then enters the communications mode and begins communicating with the other system. If your modem does not hear another modem, it returns NO CARRIER or BUSY. Pause (,): A comma in the dial sequence tells your modem to pause two seconds, then continue. You might want to use this if you dial from a system where you have to access an outside line, then dial the outside number. ATD 9,555-8912 Dial 9, pause for 2 seconds, then dial 555-8912. Note: You can use more than one comma to increase the pause time, or change the time by setting Register S8. Wait for Dial Tone (W): A W in the dial sequence tells your modem to wait for a dial tone. You could use this if you use an alternate long-distance carrier, or if you dial from a system that requires an access code for a long-distance number: ATD 23 W555-1893 Dial 23, wait for a dial tone, dial 555-1893. The X command and the contents of Register S7 determine how long the modem waits for the dial tone. If you set X2 or X4, your modem waits for 5 seconds. Otherwise, your modem waits for the time set by Register S7. If your modem does not hear a dial tone within the specified time, it returns NO DIALTONE. Wait for Silence (@): An @ in the dial sequence causes your modem to wait for 5 seconds of silence after one or more rings. You could use this if you dial a long distance service that does not produce a second dial tone. Your modem waits the length of time specified in Register S7 (default 30 seconds). If the modem does not detect silence, it returns the NO ANSWER or BUSY result code. ATDT 555-2323@23 Dial 555-2323, wait for silence, dial 23. Hookswitch Flash (!): An ! causes the modem to perform a flash. This makes the modem hang-up the phone line for about 1/2 second (like pressing and releasing the switch hook on your telephone). Some phone systems use this function to transfer calls. ATDT 555-3439! Dial 555-3439, flash. Touch Tone Dialing (T) Pulse Dialing (P) The T and P dial modifiers select the dialing method your modem uses. Your modem defaults to using pulse dialing. You could use this to use alternate long-distance services from a pulse-dial line. ATD 9 WT 555-2322 Dial 9 pulse mode, wait for a dial tone, dial 555-2322 in tone mode. Memory Dial Number (S=n) SD=n (where n is 0-2) in the dial sequence makes the modem dial one of three telephone numbers you previously stored using the &An command. ATDS=1 Dial the number stored in redial memory 1. ATDS=2 Dial the number stored in redial memory 2. Return to Command Mode (;) A ";" in the dial sequence tells your modem to return to the command mode as soon as it finishes dialing. The modem does not try to detect a carrier. You would use this command when you use the modem to dial a voice call. AT D 555-8373; Dial 555-8373. Auto-Dialing Voice Calls You can have your modem dial any telephone number, even if a computer is not connected to the other phone. Lift your telephone handset, send the dialing command, and listen for the other party to answer. At any time after the dialing stops, you can press any key to disconnect your modem. AT DT 555-1281; Dial 555-1281. When the person answers, type ATH to disconnect the modem. Dialing Timing Parameters Registers S6 through S11 control the timing of the dialing commands. Refer to "Internal Modem Registers" for complete information about using these registers. Auto Answer Operation You can set your modem to automatically answer calls. This can be useful if you need to access your computer from another computer. As set at the factory, the modem does not automatically answer incoming calls. You control the auto answer feature using Register S0. This register determines the number of rings detected before your modem answers. If you set the register 0, (default) the modem does not automatically answer the phone. Otherwise, the modem waits the number of rings you specify (1-255). AT S0=1 The modem answers after one ring. AT S0=5 The modem answers after five rings. AT S0=23 The modem answers after 23 rings. After the modem answers, it sends an answer tone and waits for an originate tone. If the modem hears an originate tone, it returns the appropriate CONNECT result code to your computer. If your modem does not detect the carrier within 30 seconds after answering, it returns a NO CARRIER result code, hangs up, and returns to the command state. If your phone rings when auto answer is disabled, your modem returns a RING result code and does not answer. You can use the Immediate Answer command (A) to have your modem pick up the phone line. Immediate Answer (A) You can force your modem to pick up the phone line, even if the phone does not ring. You might use this feature if you called someone on a voice line, then wanted to switch to communicate with their computer or if your telephone rings, and you want your modem to answer. AT A Your modem picks up the phone line and sends an answer tone. If you are switching from a voice call to a data call, the other party must send AT D to their modem. Auto Answer Timing Parameters Registers S0, S7, and S9 control the answer mode timing. (dtc/all-03/03/95)