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COMSPHERE 3800 Series Modems – Model 3830
4-2 August 1998 3830-A2-GB91-30
Switching Between Data Mode and Online Command Mode
Sometimes it is necessary to change operating parameters while the
modems are online. The Escape Sequence allows you to toggle the
modem between Data mode and online Command mode while
maintaining a connection with the remote modem. This is
accomplished using the escape sequence (+ + +) to exit Data mode and
the O command to return to Data mode.
Escape Sequence and Escape Guard Time
The Model 3830 modem uses three consecutive plus (+) characters as
the escape sequence. (To change this value, refer to S-Register S2
discussed later in Table 4-3 in the S-Register List section.)
To prevent the modem from interpreting an embedded + + + in data as
an escape sequence, the Escape Guard Time value determines the idle
time required before and after the escape sequence is issued. The
Model 3830 uses a 1-second pause as the Escape Guard Time. (To
change this value, refer to S-Register S12 discussed later in Table 4-3
in the S-Register List section.)
To enter online Command mode while in Data mode, enter the
following sequence:
TYPE: +++
The modem responds OK.
Use the O command to return to Data mode from online Command
mode. Enter the following command:
TYPE: ATO
PRESS: Enter
The modem does not send a response to the DTE, but returns to Data
mode.