Paradyne 3830 manual Command Guidelines

4. AT Command Set and S-Registers

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:

±8 data bits + no parity + 1 stop bit.

±7 data bits + no parity + 2 stop bits.

±7 data bits + parity + 1 stop bit (parity can be odd, even, mark, or space).

•All commands except A/ (Repeat Last Command) and + + +

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 does 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).

•Some commands can be accompanied by a numeric value, shown in Table 4-2 as the suffix n. For example, for the Ln command, L1 sets the speaker volume to Low and L3 sets the speaker volume to High. If no value is entered for the n value, it is treated as a zero (0) value.

•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).

Table 4-1lists all available result codes with numeric and word equivalents.

3830-A2-GB91-30 August 1998 4-3