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AT Commands
Response Number Codes / Messages
Response number codes, messages, and their corresponding meanings
are listed in Table 5-1. The connect speeds indicated are the serial port
rate (DTE), not the DCE speed.
Table 5-1. Response Messages
Code
Message
0
OK
1
CONNECT
2
RING
3
NO CARRIER
4
ERROR
5
CONNECT 1200
6
NO DIAL TONE
7
BUSY
9
CONNECT 7200
10
CONNECT 2400
11, 15
CONNECT 4800
12, 18
CONNECT 9600
13
CONNECT 12000
14
CONNECT 19200
16
CONNECT 38400
17
CONNECT 14400
19
CONNECT 57600
20
CONNECT 0300/REL
22
CONNECT 1200/REL
23
CONNECT 2400/REL
24
CONNECT 4800/REL
25
CONNECT 9600/REL
5-10
Meaning
Command received
Connect at 300 bps while X1, X2, X3, or
X4 command in effect; all rates while X
command in effect
Ring detected
Valid carrier not detected within period
specified by register S7, or carrier lost for
value of S10 or more
Command not recognized or too long
Connection made at 1200 bps
No dial tone detected for 5 seconds (X2 or
X4 command in effect)
Dialed number busy (X3 or X4 command in
effect)
DTE rate 7200 bps
DTE rate 2400 bps
DTE rate 4800 bps
DTE rate 9600 bps
DTE rate 12000 bps
DTE rate 19200 bps
DTE rate 38400 bps
DTE rate 14400 bps
DTE rate 57600 bps
MNP 300 bps connection
MNP 1200 bps connection
MNP 2400 bps connection
MNP 4800 bps connection
MNP 9600 bps connection
V.3400
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