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Chapter 5 – AT Commands, S-Registers, and Result Codes
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 77
Register Unit Range Default Description
S21 52 (34h) V.24/General Bit-Mapped Options Status: Indicates the status of
command options.
Bits 0 - 1 Reserved (0)
Bit 2 CTS behavior (&Rn)
0 = CTS tracks RTS (&R0)
1 = CTS always on (&R1) (Default.)
Bits 3-4 DTR behavior (&Dn)
0 = &D0 selected
1 = &D1 selected
2 = &D2 selected (Default.)
3 = &D3 selected
Bit 5 RLSD (DCD) behavior (&Cn)
0 = &C0 selected
1 = &C1 selected (Default.)
Bit 6 DSR behavior (&Sn)
0 = &S0 selected (Default.)
1 = &S1 selected
Bit 7 Long space disconnect (Yn)
0 = Y0 (Default.)
1 = Y1
S22 117 (75h) Speaker/Results Bit-Mapped Options Status: Indicates the status
of command options.
Default: 117 (75h) (01110101b)
Bits 0-1 Speaker volume (Ln)
0 = Off (L0)
1 = Low (L1) (Default.)
2 = Medium (L2)
3 = High (L3)
Bits 2-3 Speaker control (Mn)
0 = Disabled (M0)
1 = Off on carrier (M1) (Default.)
2 = Always on (M2)
3 = On during handshake (M3)
Bits 4-6 Limit result codes (Xn)
0 = X0
4 = X1
5 = X2
6 = X3
7 = X4 (Default.)
Bit 7 Reserved
S23 0 General Bit-Mapped Options Status: Indicates the status of
command options.
Bits 0-6 Not used
Bits 6-7 Guard tone (&Gn)
0 = None (&G0) (Default.)
1 = None (&G1)
2 = 1800 Hz (&G2)
S24 seconds 0–255 0 Sleep Inactivity Timer: Sets the length of time, in seconds, that the
modem will operate in normal mode with no detected telephone line
or DTE line activity before entering low-power sleep mode. The timer
is reset upon any DTE line or telephone line activity. If the S24 value
is zero, neither DTE line nor telephone inactivity will cause the
modem to enter the sleep mode.
S25 0.01 s 0–255 5 Delay to DTR OFF: Sets the length of time that the modem will
ignore DTR for taking the action specified by &Dn. Its units are
seconds for synchronous modes and one hundredths of a second for
other modes.
S26 0.01 s 0–255 1 RTS-to-CTS Delay: Sets the time delay, in hundredths of a second,
before the modem turns CTS ON after detecting an OFF-to-ON
transition on RTS when &R0 is commanded. Pertains to synchronous
operation only.