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Chapter 9: Setup Mode: Channel Configuration
XPress DR+ User Guide 77
The unit ignores any character sequence received not starting with AT, and only
recognizes and processes single AT-style commands. The unit treats compound AT
commands as unrecognized commands.
If the Full Verbose option is in effect, the unit responds to an unrecognized command
string that is otherwise formatted correctly (begins with AT and ends with carriage return)
with the "OK" message and takes no further action.
If the Numeric Response option is in effect, the unit responds to an unrecognized
command string that is otherwise formatted correctly with the "0" message and takes no
further action.
When an active connection is in effect, the unit transfers data and does not process
commands received from the serial interface.
When a connection is terminated or lost, the unit reverts to command mode.
When an active connection is in effect, the unit terminates the connection if it receives the
following sequence from the attached serial device:
No serial data is received for one second.
The character sequence +++ is received, with no more than one second between
each two characters.
No serial data is received for one second after the last + character. At this time, the
unit responds affirmatively per the selected echo/response mode.
The character string ATH is received, terminated with a carriage return. The unit
responds affirmatively according to the selected echo/response mode and drops the
network connection. The serial interface reverts to accepting command strings.
If this sequence is not followed, the unit remains in data transfer mode.
Table 9-7. Modem Mode Commands
Modem Mode
Command
Function
ATDTx.x.x.x,pppp or
ATDTx.x.x.x/pppp
Makes a connection to an IP address (x.x.x.x) and a remote port
number (pppp).
ATDTx.x.x.x
Makes a connection to an IP address (x.x.x.x) and the remote port
number defined within the unit.
ATD0.0.0.0
Forces the unit into Monitor Mode if a remote IP address and port
number are defined within the unit.
ATD
Forces the unit into Monitor Mode if a remote IP address and port
number are not defined within the unit.
ATDx.x.x.x
Makes a connection to an IP address (x.x.x.x) and the remote port
number defined within the unit.
ATH
Hangs up the connection (entered as +++ATH).