Command
Function
I2
Starts ROM test.
I3
Specifies firmware and device ID.
L0
Lowers speaker volume.
L1
Lowers speaker volume.
L2
Specifies medium speaker volume. (default)
L3
Raises speaker volume.
M0
Keeps speaker off.
M1
Keeps speaker on until the carrier is detected.
(default)
M2
Keeps speaker on.
N0
Disables automode, with the modem handshake
speed specified by S37.
N1
Enables automode, with the modem handshake
speed specified by S37. (default)
O0
Returns to data mode.
O1
Starts an equalizer retrain and returns to data
mode.
P
Specifies pulse dial.
Q0
Enables result codes. (default)
Q1
Disables result codes.
S
r?
Reads S register
r, where r=0–110.
S
r=n
Sets S register
r to value n (r=0–110; n=0–255).
T
Specifies tone dial.
V0
Specifies numeric responses.
V1
Specifies text responses. (default)
X0
Specifies Hayes Smartmodem 300 compatible
responses and blind dialing.
Appendix B. Using modem commands
121
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