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Multi-Tech Systems MTS2SA-T User Manual

Page 124

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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)

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.

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