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Option Register
S14 Bit mapped configuration register
Bit 0
Unused
Bit 1
0 Command echo disabled (E0)
1
Command echo enabled (default E1)
Bit 2
0
Result codes enabled (default Q0)
1
Result codes disabled (Q1)
Bit 3
0
Digit result codes (V0)
1
Word result codes (default V1)
Bit 4
Unused
Bit 5
0
Tone dial (T)
1
Pulse dial (default P)
Bit 6 Unused
Bit 7
0
Answer mode
1
Originate mode (default)
S21 Bit mapped configuration register
Bit 012
Unused
Bit 34
00
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)
Bit 5
0
DCD always ON (&C0)
1
DCD tracts the actual state of the data carrier (default & C1)
Bit 6
Unused
Bit 7
0
Long Space Disconnect disabled (default Y0)
1
Long Space Disconnect enabled (Y1)
B-10 Fax/Modem