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D - Dial: indicates to the modem that the following characters are part of
a phone number. Spaces and hyphens are OK. Commands commonly used with D
include: P, T, R, comma and semicolon.
P - Pulse: selects pulse method for dialing. It's the default setting for
the modem.
T - Touchtone: selects touchtone method for dialing. All subsequent
commands will be executed in touchtone. The modem recognizes the # and *.
Dialing speed can be changed (see Register S11).
R - Reverse: allows you to contact "originate only" modems. Placing this
command at the end of a dialing sequence puts your modem in answer mode and
enables you to contact those modems programmed to transmit, but not to
receive calls.
<comma> - Pause: creates a two-second pause in transmission, most often
used in dialing sequences. The length of the pause can be changed (see
Register S8).
<semi-colon> - Return to command mode: returns you to command mode after
dialing. It must be the last character in the dialing sequence.
En - Echo: used only in command mode. When ON (E1, the default), the
characters you type appear on (echo to) the screen. When OFF (E0),
characters don't appear on the screen, but commands are executed anyway.
Fn - Duplex: controls the echo in terminal mode. F1 (default) indicates
full duplex communication, where the local echo is turned OFF and your
characters are echoed back to you from the on-line system. Use F0 to turn
the local echo ON if the system does not echo back characters. (If local
echo is ON and you are transmitting to a system that echoes back,
everything you type appears twice, lliikkee tthhiiss.
Hn - Hook: used to hang up (put ON the hook) or pick up (take OFF the hook)
the phone. When you terminate a call with 3 plus signs, the phone lines are
still open, although the link to the host computer has been broken. H0 (or
just H) hangs up. H1 takes the phone OFF the hook. Default is 0. Note that
you must first issue the Escape command (3 plus signs) becore you issue the
hook command.
In - Inquiry: requests the product code (I0) or the ROM checksum (I1).
Mn - Monitor speaker: enables you to listen in on an attempted connection
or a connection in progress. M1, the default, turns the speaker on during
command mode and off in terminal mode. M2 turns the speaker on all the
time. M0 turns the speaker off completely.
O - Online: returns you to terminal mode (online) from command mode if you