si2439-a-gm Silicon Laboratories, si2439-a-gm Datasheet - Page 27

• Manufacturer Part Number: si2439-a-gm
• Description: V.92 And V.34 Isomodem With Global Daa
• Manufacturer: Silicon Laboratories

Command
Dn
Hn
En
E0
E1
A/
A
$
Table 10. Basic AT Command Set (Command Defaults in Bold)
Display AT command mode settings.
Answer incoming call
Re-execute last command. This is the only command not preceded by “AT” or followed by a
<CR>.
Dial
The dial command, followed by 1 or more dial command modifiers, manually dials a phone
number:
Local DTE echo
Disable
Enable
Hook switch.
Modifier
! or &
, or <
@
W
G
P
L
T
;
Rev. 1.0
Function
Flash hook switch for FHT (U4F) ms (default: 500 ms)
Pause before continuing for S8 seconds (default:
2 seconds)
Return to AT command mode
Wait for silence.
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
Redial last number.
Pulse (rotary) dialing—pulse digits: 0, 1, 2, 3, 4, 5, 6, 7,
8, 9
Tone (DTMF) dialing—DTMF digits: *, #, A, B, C, D, 0,
1, 2, 3, 4, 5, 6, 7, 8, 9.
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.
Action
when using this command.
Si2494/39
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