US Robotics 56K USB Modem User Manual page 24

M<value>—Speaker Control
Use this command to turn the speaker on and off.
Result codes:
• OK if <value> = 0—3.
ERROR if <value> ≠ 0—3.
•
Table 12. M<value> Commands
Command
M0 Speaker is off.
M1 Speaker is on until the modem detects the carrier signal (default).
M2 Speaker is always on when the modem is off-hook.
M3 Speaker is on until the carrier is detected, except when dialing.
Note: ITU-T Recommendation V.250 (05/99) standardized this command. However, the standard does not include
the additional functionality added with the M3 command.
N<value>—Modulation Handshake
Use this command to set the modem protocol for handling handshake negotiation at connection time if the
communication speed of the remote modem is different from the speed of the local modem.
Result codes:
• OK if <value> = 0—1.
ERROR if <value> ≠ 0—1.
•
Table 13. N<value> Commands
Command
N0 When originating or answering, this is for handshake only at the communication standard
specified by register S37 and the B <value> command.
N1 When originating or answering, begin the handshake only at the communication stan-
dard specified by S37 and the B <value> command. During handshake, fallback to a
lower speed may occur (default).
O<value>—Return to Online Data Mode
Use this command to exit online command mode and reenter online data mode. If the modem is not in
online command mode when this command is received, the modem generates an ERROR result code.
Result codes:
• CONNECT if <value> = 0, 1, 3 and the result code and call progress monitor is set to 0 (X0).
• CONNECT <rate> if <value> = 0, 1, 3 and the result code and call progress monitor is not set to 0
(X<value> where n = 1—7).
• NO CARRIER if the connection is not successfully resumed.
ERROR if <value> ≠ 0—1, 3.
•
Table 14. O<value> Commands
Command
O0 Instructs the modem to exit online command mode and return to data mode (default).*
O1 Issues a retrain before returning to online data mode.
Function
Function
Function
56K USB Modem
User Guide
Command Reference - 18