S27 Bit Mapped Options Status | Multi-Tech Systems MT2456SMI22

Chapter 4 - V.22bis Commands

S27 - Bit Mapped Options Status

S27 indicates the status of command options.

Default: 73 (49h) (01001001b)

Bits 0,1,3 Synchronous/asynchronous selection (&Mn/&Qn).

31 0

0 0 0 = &M0 or &Q0.

0 0 1 = &M1 or &Q1.

0 1 0 = &M2 or &Q2.

0 1 1 = &M3 or &Q3.

10 0 = Reserved.

1 0 1 = &Q5. (Default)

11 0 = &Q6.

Bit 2 Leased line control (&Ln). 0 = Dial up line (&L0). (Default)

Bits 4 - 5 Internal clock select (&Xn). 0 = Internal clock (&X0). (Default)

1= External clock (&X1).

2= Slave clock (&X2).

Bit 6 ITU-T/Bell mode select (Bn).

0= ITU-T mode (B0).

1= Bell mode (B1). (Default) Bit 7 Reserved.

S28 - Bit Mapped Options Status

S28 indicates bit mapped options status.

Default: 0

Bits 0 - 1 Reserved.

Bit 2 Reserved (always 0).

Bits 3 - 4 Pulse dialing (&Pn)

0= 39%-61% make/break ratio at 10 pulses per second (&P0). (Default)

1= 33%-67% make/break ratio at 10 pulses per second (&P1).

2= 39%-61% make/break ratio at 20 pulses per second (&P2).

3= 33%-67% make/break ratio at 20 pulses per second (&P3).

Bit 5-7 Reserved

S29 - Flash Dial Modifier Time

S29 sets the length of time, in units of 10 ms, that the modem will go on-hook when it encounters the flash (!) dial modifier in the dial string. S29 is a country dependent parameter. The S29 value cannot be changed using S29=XX. Range: 0-255 10 ms intervals

Default: 70 (700 ms) for U.S.

S30 - Disconnect Inactivity Timer

S30 sets the length of time, in tens of seconds, that the modem will stay online before disconnecting when no data is sent or received. In error-correction mode, any data transmitted or received will reset the timer. In other modes, any data transmitted will reset the timer. The timer is inoperative in synchronous mode.

Range: 0-255 tens of seconds (0-2550 seconds)

Default: 0 (disabled)

S31 - Bit Mapped Options Status

S31 indicates bit mapped options status. Default: 192 (C0h) (11000000b)

Bit 0 Single line connect message enable/disable (\Vn).

0 = Messages controlled by S95, Wn and Vn (\V0). (Default) 1 = Single line connect message (\V1).

Bit 1 Reserved (0)

Bits 2-3 Error correction progress messages (Wn). 0 = DTE speed only (W0). (Default)

1= Full reporting (W1).

2= DCE (line) speed only (W2). Bits 4-5 Caller ID (+VCID).

0= Caller ID disabled (+VCID=0). (Default)

1= Short (formatted) Caller ID enabled (+VCID=1).

2= Long (unformatted) Caller ID enabled (+VCID=2). Bits 6-7 Reserved (Default = 11b).

Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide