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Hanging Up, You can make the command modem hang up (go On Hook), or
and go Off Hook, with the H command. Entering ATH1 (upper case)
Bringing the will bring the line Off Hook just as if you had picked up the
Phone Line telephone handset. The command modem remains in command
Off Hook mode.
H0-1 You can hang up by entering ATH0 or ATH (remember that the
default value is 0 when nothing is entered). It is not necessary to use the H1command to
bring the line Off Hook when using the command modem D command to dial,since the modem will g o
off hook automatically when you hit Return at the end of the Dial command.
Inquiry for Some systems or software packages may automatically check
Product the identification of the modem with which they are communicat-
Code ing, by using the I command. This read command enables the
software to determine the type of modem with which it is commu-
I nicating.
When ATI or ATI0 (upper case) is entered, the command modem will respond with xxx,
with the first two digits indicating model, and the third digit indicating the revision level.
Exiting You can bring the command modem out of command mode back
Command into the On-Line Mode, by entering ATO (where O is the letter O,
Mode, not the number 0). In this case, the O command reverses what
Going Back was done by entering the Escape code (see Escape Code +++
On-LIne explanation).
O
Pulse or The command modem will dial numbers using either pulse or
Tone tone dialing, or in a combination of both methods. Pulse dialing
Dialing is the method used by rotary-dial telephones, which involve the timed opening and
closing of a line relay. Tone dialing is that used
P by push button Touch-Tone telephones, and is sometimes referred to as DTMF, or
Dual-Tone Multi-Frequency dialing.
T This is controlled by including a P for Pulse or a T for Tone in the
dialing command, right before the digits you wish to have dialed
in that manner.
For example, you would pulse-dial the number 555-1212 by
entering ATDP5551212 and hitting Return. You could tone-dial
the same number by entering ATDT5551212 and hitting Return.
If neither Pulse or Tone dialing is specified in the dialing com mand, the command
modem will use whatever method was last used. If the modem was reset or just powered up, it will use Pulse
dialing, even if you do not use the letter P in your dial command.
Nearly all telephone systems in the U.S. are now compatible with
tone dialing. Since that is the faster method, you will probably
choose the tone method for your dialing.
An example of combining pulse and tone dialing could involve a
PBX system where 9 had to be pulse-dialed first, then the rest of
the number tone-dialed after pausing for a second dial tone. The
number would be dialed by entering ATDP9,T5551212 and hitting Return. (The
comma causes a pause, which well explain soon.)
Result Codes It may be desirable to disable the Result Codes (see V command)
Enabled or altogether in certain applications, such as computer-controlled
Disabled auto dialing. The Q command is used to do this, with ATQ1
disabling the Result Code transmissions and ATQ0 (or ATQ)
Q0-1 enabling them. If you do not select either method, the factory
default setting will enable the Result Codes to be sent.
Forcing an To dial up another modem that is in Originate mode, your
Answer modem must be in Answer mode to initiate the "handshaking"
Tone, and establishment of a connection. This is done automatically