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7 Response Sets
When you send a command to your fax/modem, it sends a response to your
computer. For example, if you type AT[Enter ], the fax/modem should
respond with OK. The fax/modem gives out different responses for the
different tasks that it performs. Communication software use these responses
to control the flow of the program. The responses that are intercepted by the
communication program are normally not displayed on your computer screen.
This section describes the fax/modem responses returned by the fax/modem
when you communicate directly with the fax/modem.
There are five X response sets: 0, 1, 2, 3 and 4. They define certain dialing
characteristics and how the fax/modem handles dial tones and busy signals,
as described in the following sections. The response classifications are
designed to meet the requirements for various types of operation and
application. You can select an X response set by using the Xn command as
described in Section .
Aside from the X response sets, extended responses are also available that
shows the carrier speed, compression method and the error-correction
protocol as described in the following table. You can enable the extended
responses by using the Wn command as described in Section .
Fax/modem responses can appear as words or numbers. Your fax/modem is
set up to return word responses. Word responses are followed by a carriage
return and line feed. If your fax/modem is operating under an application that
handles character strings inefficiently or cannot handle them at all, you can
use the V0 command to switch to numeric fax/modem responses. Numeric
responses are followed by a carriage return only.
If you do not want to receive fax/modem responses at all, you can use Q1
command to disable them.
The following table lists and describes the available response codes, where x
means that result word/code is available:
WORD
OK
CONNECT
RING
NO CARRIER
ERROR
CONNECT 1200
NO DIALTONE
BUSY
NO ANSWER
CODE
n Value in ATXn Command
0
00
x
01
x
02
x
03
x
04
x
05
06
07
08
x
1
2
3
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
4
x
x
x
x
x
x
x
x
x
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