Command Response and Result Codes

These commands control the responses to commands issued the modem.

This command determines whether the modem echoes characters back to the DTEsystem, when in command mode.

• E0 -- Inhibits the command echo - If your system application does not expect the echo, use this setting, otherwise, entering "AT" causes your terminal to display "AATT".
• E1 -- Enables the command echo.

Used to enable and disable return results codes to the DTE.

• Q0 -- Enable the result code.
• Q1 --Disable the result code, OK, ERROR or CONNECT message will not be returned.

This command determines the format of the return result code if result codes are enabled (see Qn command). For example, the long form (word format) returns "OK" or short form (numeric format) returns "0". The long form format result code is preceded and terminated by both carriage return and line feed characters. The short form format result code is terminated by a carriage return character.

• V0 -- Selects result codes in NUMERIC format.
• V1 -- Selects result codes in WORD format.

This command determines which set of responses and calling characteristics are used. This command determines whether the modem recognizes dial tones and busy tones, and what kind of result code should be enabled. When n is 0, 1, or 3, the modem waits for the time specified by S-Register 6 (default 2 seconds) after going off-hook, then dials regardless of the presence or absence of dial tone. Blind dialing is used in some countries where dial tones could very from central office to central office, or for certain PBX's which generate unique dial tones.

• X0 -- The modem does not recognize dial tone and busy tone. The modem does not wait for dial tone, and blind dialing is enabled. The modem returns a CONNECT result code when a connection is established.
• X1 -- The modem does not recognize dial tone and busy tone. The modem does not wait for dial tone, and blind dialing is enabled. The modem returns a CONNECT XXXX result code reflecting the serial port speed when a connection is established.
• X2 -- The modem does not recognize busy tones, but waits for dial tone before dialing. If dial tone is not detected within 5 seconds, NO DIALTONE result code is returned. The modem returns CONNECT XXXX result code reflecting the serial port speed when a connection is established.
• X3 -- The modem does not recognize dial tone. If a busy tone is detected, BUSY result code is returned. The modem does not wait for dial tone, and blind dialing is enabled. The modem returns CONNECT XXXX result code reflecting the serial port speed when a connection is established.
• X4 -- If dial tone is not detected within 5 seconds, NO DIALTONE result code is returned. If a busy signal is detected, BUSY result code is returned. The modem returns CONNECT XXXX result code reflecting the serial port speed when a connection is established.

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