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AT commands: Detailed description
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devolo MicroLink ISDN i
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EN
Incoming call – RI = Ring Indicator
This MicroLink ISDN i output becomes active (ON) when the adapter detects
an incoming call (see also command ATA). Incoming calls are detected only
if the DTR control line is active (ON) or the command AT&D0 has been
issued.
Connection – DCD = Data Carrier Detect
This MicroLink ISDN i output normally becomes active (ON) when the adapter
has established a valid connection.
3.4 Error messages
In the event of errors, the contents of the registers S154 and S155 return error
codes which may be used to localize the problem. These registers can be
read using the commands ATS154? or ATS155?.
Error
codes
S154/S155
Description Cause and possible correction
AT-level error group
001/001 Establishment of connection
aborted by character input dur
-
ing establishment
Input of characters during establishment
of connection not permitted. If the input
of characters is to be permitted during
call establishment, bit 6 must be set in
register S14 (polling enabled during
establishment of connection).
001/003 Call not (no longer) present
(with ATA or ATO)
Opposite station has hung up or another
unit has answered the call.
001/004 Internet service provider proto-
col error at the serial port
Reestablish the connection.
001/005 Connection aborted by ATZ The command ATZ in the command
phase causes the abort of an existing
connection.
001/006 Inactivity timer elapsed (con-
nection aborted)
No more data was transmitted during
the time period specified in register S30
or by the AT\Tn command.
001/007 Establishment of connection
aborted by DTR = off
The DTR signal was deactivated, e.g. by
the terminal program.
001/009 Establishment of connection
aborted by ATH
Establishment of connection canceled.
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