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Integrator’s Reference Manual
5-12 80-99208-1 Rev. D
AT Command Processing Modes
Data services AT command processing consists of three
modes:
• Command mode — While in the Command mode, data
service is inactive and the DCE processes AT commands
received on the Rm interface.
• Online mode — Online mode is entered when a data
connection is established and data service becomes
active. While in the Online mode, the DCE does not
recognize AT commands on the Rm interface, but does
process in-band control data and software flow control
data.
• Online-Command mode — During Online-Command
mode, data service is in the active state, although data is
not processed. The DCE processes all AT commands
received on the Rm interface while in Online-Command
mode.
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Steps
TO ENTER ONLINE-COMMAND MODE FROM ONLINE MODE
■ Use an in-band control data escape sequence, “+++”
surrounded by guard time (see Change from Online to
Online-Command Mode (+++) on page 6-40).
or
Turn OFF the Rm interface DTR (circuit 108/2) signal
(see DTE Data Terminal Ready Behavior (&D) on page
6-16 for details).
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Steps
TO TERMINATE A DATA CALL FROM ONLINE-COMMAND MODE
■ Use the ATH command (see Hook Control (H) on page
6-22).