Multi-Tech Systems MTS2SA-T User Manual
Page 124
Chapter 10
− Modem Mode AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. MultiConnect Serial-to-Serial Adapter User Guide (S000354A)
124
Register Unit Range Default Description
S40
104 (68h) General Bit-Mapped Options Status. Indicates the status of
command options.
Default:
104
(68h)
(01101000b)
Bits 0-1
MNP Extended Services (-Kn)
0 =
Disable extended services (-K0) (Default.)
1 =
Enable extended services (-K1)
2 =
Enable extended services (-K2)
Bit
2
Reserved
Bits
3-5
Break
Handling
(\Kn)
0 =
\K0
1 =
\K1
2 =
\K2
3 =
\K3
4 =
\K4
5 =
\K5 (Default.)
Bits
6-7
Reserved*
S41
195
(C3h)
General Bit-Mapped Options Status.
Indicates the status of
command options.*
Default:
13
(C3h)
(00001101b)
Bits
0-1
Reserved
in
V.22bis
Bits 0 -1
Compression selection (%Cn)
0 =
Disabled (%C0)
1 =
MNP 5 (%C1)
2 =
V.42 bis (%C2)
3 =
MNP 5 and V.42 bis (%C3) (Default.)
Bits 2, 6
Auto retrain and fallback/fall forward (%En)
Bit 6 Bit
2 Meaning
0
0
Retrain and fallback/fall forward disabled (%E0)
0
1
Retrain enabled (%E1)
1
0
Fallback/fall forward enabled (%E2) (Default.)
Bit
3
Reserved
Bits
4-5
Reserved
Bit
7
Reserved
S46
138 Data Compression Control. Controls selection of compression.*
The following actions are executed for the given values:
S46=136 Execute error correction protocol with no compression.
S46=138 Execute error correction protocol with compression. (Default.)
S46 is not available in V.22bis.
S48
7
V.42 Negotiation Control.
Negotiation process determines the
capabilities of the remote modem. However, when the capabilities of
the remote modem are known and negotiation is unnecessary, this
process can be bypassed if so desired.
Range: 0, 7, or 128 If an invalid number is entered, it is accepted into
the S-Register, but S48 will act as if 128 has been entered.
S48=0 Disable negotiation; bypass the detection and negotiation
phases; and proceed with LAPM.
S48=7
Enable
negotiation.
(Default.)
S48=128 Disable negotiation; bypass the detection and negotiation
phases; and proceed at once with the fallback action specified
in S36. Can be used to force MNP.