CH1787(1998) View Datasheet(PDF) - Cermetek Microelectronics
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CH1787 Datasheet PDF : 13 Pages
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AT[CR]
Where: A and T must be upper case or lower case
[CR] repesents carriage return
The modem will respond with one of the following status mes-
sages, depending on whether it is optioned for abbreviated or
English status messages.
0[CR]
[CR][LF][OK][CR][LF]
(Abbreviated form)
(English form)
Where: [CR] represents carriage return (ASCII 13)
[LF] represents line feed (ASCII 13)
The modem may be retrained any time while it is idle.
Another attention sequence A/ is much like the AT sequence
except it repeats the previously entered command specified with
an AT prefix. When given, it must also be in upper case ASCII.
No carriage return is needed.
Modem States
The modem can be in either a command state or a data mode
state. When the modem is idle, it is in the command state. When
a data call is in progress, it is in the data mode state. The modem
does not recognize commands when in the data state. To recog-
nize commands, the computer must send an escape sequence
to the modem that forces it out of the data mode and into the
command mode.
The escape sequence consists of a guard time (a period where
no characters are sent to the modem) followed by 3 escape char-
acters, followed by a guard time again. At powerup, the guard
time is set to 1 second minimum, and the escape character is set
as +. These two parameters can be modified via registers S2
and S12.
The modem will stay off-hook with its carrier on after the escape
sequence is received. It returns an OK status message when it is
ready to accept commands. You may re-enter the data mode by
issuing the ONLINE command ATO [enter].
Cermetek Microelectronics, Inc.
Document No. 603-0182 Rev. D (11/98) 6
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