Westermo IDW-90 AT - Manual (Page 5)

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4. AT-command set
All parameters can be changed by using an extended AT command set described
in this chapter.
Check to see whether the factory setting will fit your environment.
The factory setting is described (highlighted) in the parameter list shown below.
If you want a different configuration from the factory default setting, take the following
steps:
… Connect the IDW-90 to ISDN interface.
… Connect the PC’s COM port to the DTE interface of the IDW-90.
… Connect the power supply to the mains socket.
… Start a terminal emulation on your PC, and verify that the baudrate setting
of the terminal emulation fits that of the IDW-90.
… Set up the parameters of the IDW-90 from the terminal emulation and save
the parameters using the AT command set.
Example:
To change the used B channel protocol to X.75 please enter the following commands:
AT**prot=10<CR> (set protocol to X.75)
AT&W<CR> (save the new configuration)
Leave your terminal emulation and start your application program.
With the exception of the command A/ (Repeat command) all commands begin with the
prefix AT and AT!,-where the prefix-AT! is used to identify commands to the analogue
modem. Commands are terminated with <CR>. Corrections in a command line are done
with <BACKSPACE>. A command line has a maximum of 240 characters. The command
line is automatically cancelled by longer input. Blanks are ignored, capital/small letters are
not significant.
The parameter settings of the IDW-90 obtained when using the-AT commands can be
permanently stored (AT&W) and are not lost by resetting or by leaving the-AT command
mode.
To enter the AT command mode during an active data connection you must use
the following sequence (“Escape sequence”):
at least 1 sec pause <+><+><+> 1 sec pause.
The time gap between all three plus signs may not exceed 1 sec.
The escape sequence is transmitted transparently to the remote device.
Note: If B channel protocol PPPasync (AT**prot=3) is selected, the escape sequence
has to be included in an asynchronous HDLC frame. The coding of the complete
asynchronous sequence is: 7E 2B 2B 2B 1B B4 7E.