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PN 88300150
Escape Method 1: +++AT<CR>
In the following example, a user who is On-Line decides to set S0 Register to 1, to configure the modem
to answer on the first ring.
1.
The user enters the sequence +++AT<CR> . The sequence is sent to the modem.
2.
The modem transmits the +++.
3.
The modem buffers AT and starts the Wait for <CR> timer.
4.
Upon receiving the <CR> the modem escapes to Command mode.
5.
The modem responds OK.
6.
The user enters the command ATS0=1<CR>. This sequence is sent to the modem.
7.
The modem buffers ATS0=1<CR> and identifies it as a valid command.
8.
The modem executes the command, setting S0=1.
9.
ATO<CR> is sent to the modem.
10.
The modem returns to On-Line mode.
Escape Method 2: <BREAK>AT<CR>
In the following example, a user who is On-Line decides to set S-Registers S0 to 1, to configure the
modem to answer on the first ring.
1.
The <BREAK> signal is sent to the modem.
2.
The modem buffers <BREAK>.
3.
The modem starts the S32 Wait for <CR> timer.
4.
ATS0=1<CR> is sent to the modem.
5.
The modem buffers ATS0=1<CR> and identifies it as a valid command.
6.
The modem escapes to Command mode.
7.
The modem executes the command, setting S0=1.
8.
The modem returns to On-Line mode.
S-Registers and Escape Sequences
There are two S-Registers that you may set to modify the functioning of your escape sequences. The
first is S-Register S32, which establishes a value for how much time may elapse between the receipt of
the beginning of the escape sequence, whether <BREAK>AT, or +++AT, and the receipt of a <CR>.
This interval is known as Wait for <CR> Time, or BREAK passthru.
You may assign a value to S32 in increments of 100 milliseconds. The default value is 20, or 2 seconds.
In the +++AT<CR> method, the Wait for <CR> Time interval begins once the A in +++AT is received by
the modem.
In the <BREAK>AT method, the Wait for <CR> Time interval begins once the modem has received the
BREAK signal.
You may use S-Register S34 in conjunction with our in-band escape sequence, +++AT<CR>, to establish
the maximum number of characters that your modem can buffer following an "AT," before a <CR> must
be received. The default value is 10 characters. Do not confuse this buffer size with our regular
Command mode buffer length of 60 characters.
S-Register S34 does not affect our out-of-band escape sequence's buffer length, which is fixed at 60
characters.
4/3/01
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