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Control commands
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devolo MicroLink ISDN i
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EN
a call (incoming call). The exchange of data between two data stations can
take place during this phase.
A renewed transition to the command phase and back, also in the case of an
existing connection, is possible with the escape command and the command
ATO. The escape command consists of a series of three escape characters
(default setting: +++) and a valid command line.
After the three escape characters have been entered, the ISDN modem is
already in the command phase. Data transfer is not interrupted until a valid
command line has been recognized.
The escape character has nothing in common with the character E of the
ASCII character set. It can be redefined in register S2.
All commands sent to the ISDN modem must begin with the ASCII characters
AT or at (not valid: At or aT) and must be concluded with
M. A valid com-
mand line in an escape sequence is restricted to a maximum of 40 characters.
The command AT&F loads the firmware default parameter settings. The
ISDN modem is thus reset to its factory defaults. This command is not exe
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cuted during existing connections.
2.2 Bit-oriented registers
Bit-oriented registers are primarily used to provide status information.
Please note that the modification of a single value in the bit-oriented register
may have several functions. Great caution should thus be applied when
changing bit-oriented registers! We recommend the use of the AT commands
to change the configuration of the ISDN modem. A complete description of
the S registers can be found in the chapter
'AT commands: Detailed descrip-
tion'.
2.2.1 Modifying bit-oriented registers
The following example will illustrate the modification of the bit-oriented
options of a register. To set the bit 6 of register S14, enter the command
ATS14.6=1.
If you would like this value to be maintained after the ISDN modem is
switched off, the new entry can be stored with the command AT*W.
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