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7: Tunneling
XPort AR User Guide 123
Modem Emulation
The XPort AR supports Modem Emulation mode for devices that send out modem
signals. There are two different modes supported:
Command Mode: sends back verbal response codes.
Data Mode: information transferred in is also transferred out.
It is possible to change the default on bootup for verbose response codes, echo
commands, and quiet mode. The current settings can be overridden, however on
bootup it will go back to the programmed settings.
Configure the connect string as necessary. The connect string appends to the
communication packet when the modem connects to a remote location. It is possible
to append additional text to the connect message.
Command Mode
The Modem Emulation’s Command Mode supports the standard AT command set.
For a list of available commands from the serial or telnet login, enter AT?. Use
ATDT, ATD, and ATDP to establish a connection:
+++
Switches to command mode if entered from
serial port during connection.
AT?
Help.
ATDT<Address Info>
Establishes the TCP connection to socket
(<IP>/<port>).
ATDP<Address Info>
See ATDT.
ATD
Like ATDT. Dials default connect mode
remote address and port.
ATO
Switches to data mode if connection still
exists. Vice versa to '+++'.
ATEn
Switches echo in command mode (off - 0, on -
1).
ATH
Disconnects the network session.
ATI
Displays modem information.
ATQn
Quiet mode (0 - enable results code, 1 -
disable results code.)
ATVn
Verbose mode (0 - numeric result codes, 1 -
text result codes.)
ATZ
Restores the current state from the setup
settings.
A/
Repeat last valid command.
All of these commands behave like a modem. For commands that are valid but not
applicable to the XPort AR, an “OK” message is sent (but the command is silently
ignored).