Comtrol AT Command Set Rev A User Manual
Page 129
AT Commands Reference Manual
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Conexant
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S19 - Reserved
S19 is supported for backwards compatibility only. No value can be written. Responds
with default value.
Range:
None
Default: 0
S20 - Reserved
S20 is supported for backwards compatibility only. No value can be written. Responds
with default value.
Range:
None
Default: 0
S21 - V.24/General Bit Mapped Options Status
S21 indicates the status of command options.
Default: 52 (34h) (00110100b)
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