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Option Register
S14 Bit mapped configuration register
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
S21 Bit mapped configuration register
Bit 012
Bit 34
Bit 5
Bit 6
Bit 7
B-10 Fax/Modem
Unused
0
Command echo disabled (E0)
1
Command echo enabled (default E1)
0
Result codes enabled (default Q0)
1
Result codes disabled (Q1)
Digit result codes (V0)
0
1
Word result codes (default V1)
Unused
0
Tone dial (T)
1
Pulse dial (default P)
Unused
0
Answer mode
1
Originate mode (default)
Unused
0 0
Modern ignores DTR (&D0)
01
On-to-Off transition on DTR causes the modem to go to the
command state (&D1)
10
On-to-Off transition on DTR cause the modem to hang up
(default &D2)
11
On-to-Off transition on DTR causes the modem to reset (&D3)
0
DCD always ON (&C0)
1
DCD tracts the actual state of the data carrier (default & C1)
Unused
0
Long Space Disconnect disabled (default Y0)
1
Long Space Disconnect enabled (Y1)
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