參數(shù)資料
型號(hào)： SI2439-A-FM
廠商： Silicon Laboratories Inc
文件頁數(shù)： 20/70頁
文件大?。?/td> 0K
描述： IC ISOMODEM 33.6KBPS 38-QFN
標(biāo)準(zhǔn)包裝： 364
系列： *
Si2494/39
Rev. 1.0
27
Table 10. Basic AT Command Set (Command Defaults in Bold)
Command
Action
$
Display AT command mode settings.
A
Answer incoming call
A/
Re-execute last command. This is the only command not preceded by “AT” or followed by a
<CR>.
Dn
Dial
The dial command, followed by 1 or more dial command modifiers, manually dials a phone
number:
Modifier
Function
! or &
Flash hook switch for FHT (U4F) ms (default: 500 ms)
, or <
Pause before continuing for S8 seconds (default:
2 seconds)
;
Return to AT command mode
@
Wait for silence.
G
Polarity reversal detect. By placing the “G” character in
the dial string (i.e. ATDTG1), the Si2494/39 will monitor
the telephone line for polarity reversals. If a busy tone
is detected, the Si2494/39 will report “POLARITY
REVERSAL” if a polarity reversal was detected or “NO
POLARITY REVERSAL” if a polarity reversal was not
detected. In each case, the result code is followed by
“OK”. If the S7 timeout occurs before a busy tone is
detected, the Si2494/39 will report “NO CARRIER”.
Polarity reversal monitoring begins after the last digit is
dialed and ends when the busy tone is detected or S7
timeout occurs.
Note:
It is not possible to establish a modem connection
when using this command.
L
Redial last number.
P
Pulse (rotary) dialing—pulse digits: 0, 1, 2, 3, 4, 5, 6, 7,
8, 9
T
Tone (DTMF) dialing—DTMF digits: *, #, A, B, C, D, 0,
1, 2, 3, 4, 5, 6, 7, 8, 9.
W
Wait for dial tone before continuing for S14 seconds
(default: 12 seconds). Blind dialing modes X0, X1 and
X3 do not affect the W command.
If the DOP bit (U7A, bit 7) is set, the “ATDTW” com-
mand will cause the ISOmodem to pause dialing and
either report an “OK” if a dialtone is detected or “NO
DIALTONE” if a dial tone is not detected.
En
Local DTE echo
E0
Disable
E1
Enable
Hn
Hook switch.
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