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AT Command Set and S-Registers
Table 4-1. AT Command Reference (5 of 18)
AT
Command Description
X n
EXTENDED RESPONSE CODES, DIAL TONE DETECT,
BUSY TONE DETECT
This command controls three different configuration options.
Extended Response Codes allow additional information to
be displayed in response code messages.
When disabled, only Basic response codes (OK,
CONNECT, RING, NO CARRIER, and ERROR) are
displayed. Use X0 to disable extended result codes.
When Extended response codes are enabled , CONNECT
messages include the data rate, and may also be set to
include information on error control and data compression.
Extended result codes also report reasons why a connection
failed, such as NO ANSWER, BUSY, and NO DIALTONE.
Use X1–X7 to enable extended response codes. For more
information on response codes, refer to Appendix C.
Dial Tone Detect, if enabled, causes the modem to wait (up
to the time set in S7) for a dial tone before dialing. If
disabled, the modem dials the call regardless of dial tone
detection (also known as blind dialing).
Busy Tone Detect, if enabled, sets the modem to monitor for
a busy tone. If disabled, the modem ignores busy tones.
(continued on next page)
4-6
Issue 2
May 1995
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