At Commands; The At Command Interface; Enter Multiple Commands; Use Escape Sequences - Digi TransPort WR11 User Manual

Using the command-line interface

AT commands

Digi TransPort supports AT commands and Special registers (S registers).

The AT command interface

The AT command prefix is for commands that are common to modems. To configure the router using
AT commands, you must first connect it to a suitable asynchronous terminal.
1. Set the interface speed/data format for your terminal to 115,200 bits per second, 8 data bits,
no parity and 1 stop bit. You can change these settings later if necessary.
2. When your terminal is correctly configured, apply power and wait for the B2 indicator to stop
flashing. The device is now ready to respond to commands from an attached terminal and is in
command mode. Alternatively, you can configure the router to automatically connect to a
remote system on powerup.
3. Type at (in upper or lower case), and press [Enter]. The router should respond with the
message OK. This message is issued after successful completion of each command. If an invalid
command is entered, the router will respond with the message ERROR. If there is no response,
check that the serial cable is properly connected and that your terminal or PC communications
software is correctly configured before trying again. If you have local command echo enabled
on your terminal, the AT command may display as aatt. If this happens, use the ate0 command
(which appears as aattee00), to prevent the router from providing command echo. After
entering this command, further commands display without the echo.

Enter multiple commands

After the prefix, you can type one or more commands on the same line, up to 40 characters. When the
line is entered, the router will execute each command in turn.

Use escape sequences

If you enter a command such as atd, which results in the router successfully establishing a connection
to a remote system, it will issue a CONNECT result code and switch from command mode to on-line
mode. This means that it will no longer accept commands from the terminal. Instead, data will be
passed transparently through the router to the remote system. In the same way, data from the
remote system will pass straight through to your terminal.
The router will automatically return to command mode if the connection to the remote system is
terminated.
To return to command mode manually, you must enter a special sequence of characters called the
escape sequence. This consists of three occurrences of the escape character, a pause (user
configurable) and then at. The default escape character is +. The default escape sequence is:
+++ { pause} at
Entering this sequence when the router is on-line causes the router to return to command mode but it
will NOT disconnect from the remote system unless you specifically instruct it to do so by using ath or
another method of disconnecting. If you have not disconnected the call, use the ato command to go
back on-line.
Digi TransPort® Routers User Guide
AT commands
152