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Chapter 10 − Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 125
Register Unit Range Default Description
S82 3, 7, or 128 128 Break Handling Options
(V.22bis only)
Break Signals provide a way for the user to get the attention of the
remote modem. The break type depends on the speed application.
LAPM specifies three methods of break signal handling; in sequence,
expedited, and destructive. If an invalid number is entered, it is
accepted into the S-Register, but S82 will act as if the default value
has been entered.
S82 = 3 Expedited: Modem sends a break immediately; data integrity
is maintained both ahead of and after the break.
S82 = 7 Destructive: Modem sends a break immediately; data being
processed by each modem at the time of the break is
destroyed.
S82 =128 In sequence: Modem sends a break in sequence with any
transmitted data; data integrity is maintained both ahead of
and after the break (default)
S86
0–26 21 Call Failure Indication. When the modem issues a NO CARRIER
result code, a value is written to S86 Register to help
determine the reason for the failed connection. S86 records
the first event that contributes to a NO CARRIER message.
The code definitions are:
S86=0 Normal hangup, no error occurred.
S86=1 Reserved.
S86=2 Reserved.
S86=3 Call Waiting caused disconnect.
S86=4 Physical carrier loss.
S86=5 No error correction at the other end.
S86=6 No response to feature negotiation.
S86=7 This modem is async only; the other modem is sync only.
S86=8 No framing technique in common.
S86=9 No protocol in common.
S86=10 Bad response to feature negotiation.
S86=11 No sync information from the remote modem.
S86=12 Normal hangup initiated by the remote modem.
S86=13 Retransmission limit reached.
S86=14 Protocol violation occurred.
S86=15 Lost DTR.
S86=16 Received GSTN cleardown.
S86=17 Inactivity timeout.
S86=18 Speed not supported.
S86=19 Long space disconnect.
S86=20 Key abort disconnect.
S86=21 Clears previous disconnect reason.
S86=22 No connection established.
S86=23 Disconnect after three retrains.
S86=24 Call Waiting tone detected.
S86=25 Extension pickup detected.
S86=26 Remote hangup detected.
S91 dBm 0–15 10 PSTN Transmit Attenuation Level. In non-PCM modes (V.90 or
K56flex are PCM modes), S91 sets the transmit attenuation level from
0 to 15 dBm for the PSTN mode, resulting in a transmit level from 0 to
-15 dBm. In some countries, the transmit level may not be changed
and there are checks to prevent transmit attenuation level change.
The default is country dependent.