AT Mode

Data Communication and Host Modes

If the serial port of the Raven is in any mode other than AT or

PassThru, the AT command mode can be re‐entered by:

•Deactivating DTR (if &D2 or Ignore DTR, S211, is not set).

•Issuing the +++ escape sequence (if Disable AT Escape, DAE, is not set).

•Resetting or Power cycling the modem.

Note: DTR needs to be asserted (S211=1 or &D0) by the host before

PPPMode, SLIP Mode, UDP PAD Mode, or TCP PAD Mode can be entered.

Using a terminal connection, AT commands are used to configure the modem, command it to do something, or query a setting. For a full listing of the AT commands, refer to the appendix. AceManager is a graphical user interface for most AT Commands.

•AT commands must always be terminated by <CR> (ASCII character 0x0D), a carriage return (pressing enter on the keyboard). Some may also include a new line or line feed <LF>.

•If E=1 (Echo On), the AT command (including the termi‐ nating <carriage return) will be displayed (output) before any responses.

•Two settings affect the format of AT command output: V (Verbose) and Q (Quiet).

•If Q=1 (Quiet On), no result codes are output whatsoever, so there is no response generated by a (non query) command.

•If Q=0 (Quiet Off), result codes are output. The format of this output is then affected by the Verbose setting.

If Quiet mode is off, the result code is affected as follows:

For V=1 (Verbose mode), the textual result code is sur‐ rounded by a carriage return and new line. Any AT query response is also surrounded by a carriage return and new line.

For V=0 (Terse mode), a numeric result code is output with a single trailing carriage return (no new line is output), while any AT query response is followed by a carriage return and new line (there is no preceding output).

•For example, possible output to the AT command “AT” with carriage return (assuming quiet mode is not on) is:


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