User`s guide

Status Registers
Modem 3600 10-5
Escape Character S2
The standard escape character is a + sign (ASCII value of 43). To
change the character, set S2 to the desired ASCII value (0-127). To
disable the escape command, set S2 to any value greater than 127
(128-255).
End-of-Line Character S3
The standard end-of-line character is the carriage return (ASCII value of
13). This character ends each command as it is sent to the modem. It is
also sent by the modem after each status message or number code. To
change the character, set S3 to the desired ASCII value (0-127).
Line-Feed Character S4
The standard character is the line feed (ASCII value of 10). This
character is sent by the modem after each status message. To change it,
set S4 as desired (0-127).
Backspace Character S5
The standard character is the backspace (ASCII value of 8). To change
it, set S5 to the desired value (0-127).
Pause Before Dialing S6
When dial tone detection is disabled (command X, X1, or X3 in effect),
the modem waits the number of seconds (0-255) stored in this register
before dialing. The default value is 2 (seconds).
Pause for Ringback and Carrier Detection /
Wait for 2nd Dial Tone S7
If ringback is not detected in the number of seconds in S7 (1-255), the
modem disconnects and sends the NO CARRIER message or code. If
ringback is detected, the modem begins to look for a carrier.
If carrier is not detected within the number of seconds in S7, the modem
hangs up and sends the NO CARRIER message or code.
Values between 1 and 255 may be used. The default value is 30
(seconds).