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CHAPTER 10: S-Registers
Register
Range
Default
Function
S19
—
—
Not Used.
S20
—
—
Not Used.
S21
—
—
Bit-Mapped Options.
Bit
Option
Val Descrip Cmd
0
Telephone Jack 0
RJ-11
&J0
1
RJ-12
&J1
1
Not Used
2
RTS/CTS
0
CTS/RTS &R0
1
CTS
&R1
always true
3,4
DTR
0
Ignore &D0
DTR
1
Modem
&D1
to Cmd.
State on
On-to-Off
DTR transition
2
Modem
&D2
hangs-up
on On-to-Off
DTR transition
3
Init. state &D3
on On-to-Off
DTR transition
5
DCD
0
Always On
&C0
1
Follows &C1
Carrier
6
Not Used
7
Long Space
0
Disabled Y0
Disconnect
1
Enabled Y1