Basic Commands

The escape sequence causes the modem to go to the off-line command state from the on-line data state. After this escape sequence, the modem can accept user's AT commands. The escape sequence consists of three escape code that is defined by S-Register 2 (default value: decimal 43(+)).

Do not enter any character before and/or after the "+++" for a guard time specified by S-Register 12 (default: 1 second). The duration between escape codes must also be within the guard time. After the modem recognizes a valid escape sequence, an "OK" result code is returned. If an escape sequence is valid, the escape code is transmitted to a remote modem. The ATO command is used to go back to on-line data state.

For example:
ATD 0123456 [enter]
CONNECT 19200
[data] [----]
( 1 sec pause )
+++ (Without 1 sec pause between escape codes)
( 1 sec pause )
OK (On-line command state)
ATH0 [CR] (Disconnect the line)
OK

This command re-executes the previous command processed by the modem. This command will be useful to re-dial without entering a dial string when a line is busy or unanswered. This command is not preceded by "AT", or followed by [Enter].

This command instructs the modem to return its product identification information.

• I0 -- Returns the product code.
• I1 -- Reports the 3 digits pre-computed ROM checksum code.
• I2 -- Calculates a checksum of the modem firmware ROM and indicates OK or ERROR for the checksum validity.
• I3 --Returns the modem ROM version.
• I4 -- TBD
• I5 -- TBD
• I6 -- Returns the modem data pump model.

This command resets the modem and recalls the stored configuration as defined at power on time.

• Z0 -- Reset and recall stored user profile 0.
• Z1 -- Reset and recall stored user profile 1.

This command reloads the factory default profile.

• &F0 -- Recall Factory Profile 0. Factory Profile 0 contains the default values from the modem chipset supplier.
• &F1 -- Recall Factory Profile 1. Factory Profile 1 contains the default values defined by the product manufacturer.

This command is only included for compatibility and performs no function. The value is written into S-Register 21.

This command displays the current active configuration, stored user profiles, and the first four stored telephone numbers. Applications may change these profile.

If the modem's non-volatile memory is detected as defective by the modem's NVRAM test, the modem will display NVRAM FAILED OR NOT INSTALLED

This command stores the current, active configuration including S-Registers into non-volatile memory as stored user's profile 0 or 1. Storable parameters can be viewed by &V command. Stored parameters can be recalled into active configuration by Zn command or at power on.

• &W0 -- Store active configuration as user's profile 0.
• &W1 -- Store active configuration as user's profile 1.

This command selects which of two user's profiles will be loaded into the active configuration following Power on Reset.

• &Y0 -- Selects power up configuration as user's profile 0.
• &Y1 -- Selects power up configuration as user's profile 1.

This command stores up to 4 telephone number dial strings into one of 4 non-volatile memory locations specified by n. This stored phone number can be used for later abridged dialing with the DS=n command.

n: Entry number (range 0-3)
x: dial string less than 45 digits (including dial modifiers)