2400 BPS Internal Modem  (250-1034)   Using The Modem  Faxback Doc. # 5052

Before using your modem, be sure you have installed the hardware as described
in Faxback Document # 5051 and that you are not using another serial device,
such as a mouse, on the same communications port.

This section explains how to initiate and receive a call. It also explains 
how to change modes of operation.

When you use your modem to dial another computer, the modem waits, as the
phone rings, until the dialed number is answered. If the number is busy or
there is no answer after a specified period of time, the modem hangs up. If
your call is completed, your modem disconnects the line when you are finish-
ed sending or receiving data.

If your are using a "smart" communications package (one that controls thee
modem for you), you do not need to learn the modem commands. Refer to the
instructions for your communications software package.

If you are using a "dumb" terminal emulation program (one that does not
control the modem for you), you only need to learn a few of the basic com-
mands to be able to talk directly to the modem. (See "Using the Basic 
Commands" in the next section.)

PREPARING TO INITIATE A CALL

1. Set up your communications software for the correct baud rate (in bits 
   per second), word length, parity, and so on (as described in Faxback 
   Document # 5051 and in your communications software manual for the 
   computer or data base you are calling.

For a more advanced explanation or communications parameters, refer to
Faxback Document # 5049.

2. Type thee command ATD1234567 and then press <ENTER>.

    AT is the attention code that tells the modem to "wake up" and be ready
    for a command.

    D is the dial command.

    123-4567 is the telephone number you want the modem to dial. (You can 
    use a hyphen (-) or parentheses () in phone numbers, but the modem 
    ignores these symbols.

NOTE: For a list of commands, see Faxback Document # 5049.

The D command causes the modem to go "off hook" and wait for a dial tone. If
there is no dial tone, the modem sends a NO DIALTONE message to the
communications software, which in turn displays this message on the screen.
After the dial tone is detected, the modem dials the telephone number. It
waits for a preset amount of time for the number to be answered and for a
carrier to be sent out from the answering modem. (A carrier is the buzz or
squeal that you hear on the phone.) If the number is busy, a BUSY message
appears on the screen. If a carrier is not detected, a NO CARRIER message
appears.

If a connection is made, this is confirmed by one of the following messages or
result codes. Result codes are described in Faxback Document # 5054.

    CONNECT (if it is a 300 bps connection)
    CONNECT 1200 (if it is a 1200 bps connection)
    CONNECT 2400 (if it is a 2400 bps connection)

You can now proceed with your normal communication process with the remote
computer (copying a file, loading a file, and so on.)

TONE DIALING

To dial the number using tone dialing instead of pulse dialing, type:

    ATDT1234567

    Then, press <ENTER>.

    T is the command for tone dialing mode.

TO CONNECT TO AN OUTSIDE LINE USING 9

If you use a PBX line and must dial 9 for an outside line and pause for a
second dial tone before dialing the outside number, type:

    ATD9,5551212

    Then, press <ENTER>.

Comma (,) is the command to pause when dialing.

TO REPEAT THE LAST MODEM COMMAND

To resend the last command (such as to redial a busy number), type:

    A/

NOTE: You do not need to press <ENTER>.

PREPARING TO RECEIVE A CALL

To have your modem automatically answer the phone after a certain number of
rings, and then send out a carrier signal, type:

    ATSO=3

    Then, press <ENTER>.

NOTE: 0 is the numerical zero.

SO is the command the to answer the phone immediately, without waiting for a
ringing signal, and then out a carrier tone (to carry your data), type:

    ATA

    Then, press <ENTER>.


(smm 08/26/93)