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C-2 Modem Commands
Table C-1 Continued
Command Description
Dn Dial Command. ATD causes the modem to dial the number that follows
D in the command line. The valid dial digits and dial modifiers are
defined in the Dial Modifiers table.
Parameters: none
NOTE: In some countries, a telephone number is required after the
ATD command. In pulse dialing, nondigit characters have no effect.
En Command Echo Option. ATEn disables or enables the local echo of
entered characters while the modem is in the command mode.
Parameters: n = 0, 1
n = 0 Disables local echo
n = 1 Enables local echo (default)
Hn Hook Control Option. ATHn controls the on-hook relay.
Parameters: n = 0, 1
n = 0 Modem on-hook (hang-up) (default)
n = 1 Modem off-hook
NOTE: The H1 command is not permitted in some countries. In those
cases, ATH1 returns an error.
In Request Identification Option. ATIn interrogates the modem for its
product identification code, ROM checksum, or ROM checksum status.
Parameters: n = 0, 1, 2, 4, 9
n = 0 Returns firmware version
n = 1 Calculates ROM checksum and displays it (for example, 12AB)
n = 2 Performs ROM check, calculates and verifies the checksum,
then displays OK or ERROR
n = 4 Returns software version of the data pump
n = 9 Returns country code
Ln Monitor Speaker Volume. ATLn sets the speaker volume during fax and
data communications to low, medium, or high.
Parameters: n = 0 - 3
n = 0 Low volume
n = 1 Low volume
n = 2 Medium volume (default)
n = 3 High volume
NOTE: To turn the speaker completely off, use the M0 command.
Mn Speaker Control Option. ATMn controls the speaker on/off operation
during fax and data communications.
Parameters: n = 0 - 3
n = 0 Speaker off
n = 1 Speaker on until carrier is detected (default)
n = 2 Speaker always on when modem is off-hook
n = 3 Speaker on after dialing until carrier is detected
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