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5.0 Hayes Emulation Mode
• O — Forced On-Line. For asynchronous operation only. When the
modem is on-line, you can return to the command state by entering
the escape code (+++). After the desired command is executed, use the
O command to force the modem from the command state to the on-line
state.
• P — Pulse Dial. The P command instructs the modem to pulse dial. It
can be entered anywhere in the dialing string: AT P5551212; or it can
be entered alone, followed by a carriage return, AT P, in which case all
subsequent telephone numbers are pulse dialed. If the dial command
does not specify which dialing mode to use, the modem defaults to the
last mode specified.
• S= - Modify S Register. This command is used to write information to
a specified S register. The syntax is Sr=n, where r is the number of the
register to be modified and n is the value to be written to it; for example:
AT S7=30
This command would change the value of register S7 to 30. If you enter
just =5, the auto-dialer changes the value of the last register used to 5.
More information on S registers is included in Section 5.3.
• S? — Read S Register. This command instructs the autodialer to read
the contents of the specified S register. The syntax is Sr?, where r specifies
the register to be read. For example, S7? reads the value of register S7.
The value is displayed on the computer or terminal monitor. If you enter
? by itself, the autodialer displays the value of the last register used; if =
is entered by itself, the autodialer displays the number of the last register
used (e.g., S2). For information on how to interpret S register values,
see Table 5-3.
• T — Tone Dialing. This command causes a telephone number in the dial
command string to be dialed using tone signals. (See the P command
above for additional information.)
• W — Wait For Dial Tone. The W command (or colon) is used in a dial
string to instruct the Modem to wait for a dial tone before proceeding.
Adjust the wait time (default, 30 seconds) by changing the value in
register S7. If no dial tone is detected within the specified time, the
Modem hangs up and gives a NO DIALTONE result code (if the result
code is enabled by the X command).