Multi-Tech Systems MTS2SA-T ユーザーズマニュアル

Chapter 10 

− Modem Mode AT Commands, S-Registers, and Result Codes 

Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A) 

 

3, 7, or 128  128 

  

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) 

  

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. 

 dBm 

0–15 10 

 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.