Paradyne 3821PLUS manual Command Guidelines, AT Command List

COMSPHERE 3821Plus Modem

To enter online Command mode while in Data mode, enter the following sequence:

TYPE: + + +

Use the O command to return to Data mode from

online Command mode. Enter the following command:

TYPE: ATO

PRESS: Enter

Command Guidelines

Review the following guidelines before using any AT Commands.

•The escape sequence (+ + +) is used to enter online Command mode from Data mode.

•The asynchronous character format for the

AT command set must be one of the following:

Ð8 data bits + no parity + 1 stop bit.

Ð7 data bits + no parity + 2 stop bits.

Ð7 data bits + parity + 1 stop bit (parity can be odd, even, mark, or space).

•All commands except A/ (repeat last command) and the escape sequence (+ + +) must begin with the characters AT and end by pressing the Enter key. The AT (or at) prefix clears the command buffer and matches the modem speed and parity to that of the DTE. Commands can be upper- or lowercase, but the modem will not recognize mixed case prefixes (At or aT).

•Commands can be entered one at a time or in strings. Strings can have up to 40 characters after the AT prefix. You can use spaces, hyphens (-), and parentheses ( ) as fillers to make the commands easier to read; the modem ignores these fillers and they are not counted among the characters which make up the command string. Commands must be entered on one line and end with the carriage return character (Enter key).

•Commands shown with the suffix n have several options associated with them. For example, in the Ln command, L1 sets the speaker volume to Low and L3 sets the speaker volume to High. Omitting the suffix has the same effect as using a zero suffix; for example, ATX is equivalent to ATX0.

•The A/ command (without pressing the Enter key) causes the modem to repeat the last command entered.

•Valid commands are acknowledged with numeric or word result codes (unless the result codes have been disabled using the Q1 command).

Appendix B lists all available result codes with numeric and word equivalents.

AT Command List

AT commands are issued from an asynchronous DTE, such as a PC, and control the modem's operation and software configuration. AT commands are only applicable when the DTE Dialer Type configuration option is set for AT. (See &Mn and &Qn commands.)

AT commands are entered while the modem is in Command mode and use the following format:

TYPE: ATXn

Where: X is the AT command and n is the specific value for that command.

PRESS: Enter

Table 4-1lists all AT commands supported by the 3821Plus modem. The Async Dial factory default is listed in bold.

Reference to particular country codes in this guide is not an assurance that the modem has been approved for use in that country. Consult your sales representative.

Not all commands are valid in all countries. See Appendix H.

4-2 January 1999 3821-A2-GB20-40