H3C MSR810 - Page 249

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Table 48 AT commands in common use
Command
Description
A
Forces the modem to go off-hook in answer mode. If a call is coming in, the modem will try
to answer it without waiting for the ringtone. This command is useful when manual
answer mode is used.
B
n
Sets the modulation protocol preference.
Available options:
• B0—Selects the IT U V. 22 mode. The transmission speed is 1200 bps.
• B1—Selects the Bell 212 mode. The default transmission speed is 1200 bps.
• B2/B3—Cancels the ITU V.23 backward channel.
• B15—Selects the ITU V.21 mode. The transmission speed is 300 bps.
• B16—Selects the 103J mode. The transmission speed is 300 bps. This setting is the
default for Compaq Presario 192-VS and Compaq Presario 288-VS modems.
D
n
Dials a telephone number. The n argument represents the dial string. In pulse dialing
mode, the modem ignores nonnumeric characters.
E
n
Controls echo of commands to the configuration terminal.
Available options:
• E0—Disables echo of commands to the configuration terminal.
• E1—Enables echo of commands to the configuration terminal. This option is the
default.
H
n
Sets the method to terminate a call.
Available options:
• H0—Forces modem on-hook to hang up the line (the default).
• H1—Forces modem off-hook to answer or dial.
I
n
Displays modem information and results of checksum tests on firmware.
Available options:
• I0/I3—Displays the default transmission speed and controller firmware version.
• I1—Runs a checksum on the ROM and displays the result.
• I2—Runs a checksum on the ROM and displays the checksum status:
 OK—The checksum is correct.
 ERROR—The checksum is incorrect.
• I4—Displays the hardware version of the data pump.
• I5—Displays the product code, software version, hardware version, and country
code.
• I9—Displays the country code.
L
n
Sets the speaker loudness for fax and data communication.
Available options:
• L0/L1—Low volume.
• L2—Medium volume (the default).
• L3—High volume.
M
n
Sets the speaker mode for fax and data communication.
Available options:
• M0—Speaker is always off.
• M1—Speaker is on until the carrier is detected. This option is the default.
• M2—Speaker is on when the modem is off-hook.
• M3—Speaker is on after a dial until the carrier is detected.