Chapter 1 – AT Commands, S-Registers and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI/MT5656SMI Reference Guide (S000306C)
54
Register Unit Range Default Description
S27
73 (49Ah)
General Bit-Mapped Options Status:
Indicates the status of
command options.
Default:
73 (49h) (01001001b)
Bits 0, 1, 3 Synchronous/asynchronous selection (&Mn/&Qn)
3 1 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
1 0 0 Reserved
1 0 1 &Q5 (Default.)
1 1 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 CCITT/Bell mode select (Bn)
0 =
CCITT mode (B0 – Default for MT5600SMI)
1 =
Bell mode (B1 – Default for MT5656SMI)
Bit 7 - Reserved
S28
0
General Bit-Mapped Options Status:
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)
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
10 ms
0–255 70
Flash Dial Modifier Timer:
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. Default: 70 (700 ms)
for U.S
.
S30
10
s 0–255 0
Disconnect Inactivity Timer:
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
.
S31
192
(C0h)
General Bit-Mapped Options Status:
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)