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Bit Mapped S21
Comman
Bit
Value
d
6, 0 00
&S
10
&S1
01
&S2
11
&S3
5, 1 00
&C
10
&C1
01
&C2
11
&C3
2
0
&R
1
&R1
4, 3 00
&D
01
&D1
10
&D2
11
&D3
7
0
Y
1
Y1
Description
DSR forced on
DSR on when online
DSR off 5 seconds after disconnect
DSR follows off hook (OH)
DCD always on
DCD on while carrier present
DCD on except for 5 seconds after
disconnect
DCD follows RTS on remote modem; not
valid in reliable mode
CTS follows RTS by S26 delay
CTS always on
Modem ignores DTR
Modem assumes command mode when
DTR turns off
Modem hangs up when DTR turns off
Modem resets when DTR turns off
Long space disconnect disabled
Long space disconnect enabled
Modem 3600
Status Registers
10-9
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