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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide
81
Register Unit
Range
Default
Description
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.
S9
5
0
Extended Result Codes Control.
A bit set to a 1 in this parameter,
in conjunction with the W command, will enable the corresponding
extended result code. *
The +MR, +ER, and +DR settings also control S95 bits 2, 3, and 5,
respectively. The more recent settings of +MR, +ER, and +DR, or
host writing of S95 bits 2, 3, and 5, along with the W command
setting, determine the corresponding actual result code reporting (see
+MR, +ER, DR, and W commands).
Bit 0 CONNECT result code indicates DCE speed instead of DTE speed.
Bit 1 Append/ARQ to CONNECT XXXX result code in error-correction
mode (XXXX = rate).
Bit 2 MCR: XXXX result code (XXXX = modulation) and
+MRR: XXXX result code (XXXX = rate). (Also, see +MR.)
Bit 3 ER: XXXX result code (XXXX = protocol identifier).
Bit 4 Reserved.
Bit 5 DR: XXXX result code (XXXX = compression type).
Bits 6-7 Reserved.