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| 型號： | SI2493-D-GT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 29/60頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ISOMODEN GLOBAL DAA 24TSSOP |
| 標準包裝： | 62 |
| 系列： | * |
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Si2493
Rev. 1.3
35
Table 10. Extended AT% Command Set (Command Defaults in Bold)
Command
Action
%$
Display AT% command settings.
%B
Report blacklist. See also S42 register.
%Cn
Data compression
%C0
Disable V.42bis and MNP5 data compression
%C1
Enable V.42bis in transmit and receive paths. If MNP is selected (\N2), then %C1 enables
MNP5 in transmit and receive paths.
%C2
Enable V.42bis in transmit path only.
%C3
Enable V.42bis in receive path only.
%On
Answer mode.
%O1
Si2493 will auto-answer a call in answer mode.
%O2
Si2493 will auto-answer a call in originate mode.
%Vn
Automatic Line Status Detection.
After the %V1 and %V2 commands are issued, the Si2493 will automatically check the telephone
connection for whether or not a line is present. If a line is present, the Si2493 will automatically
check if the line is already in use. Finally, the Si2493 will check line status both before going off-hook
and again before dialing. %V1 uses the fixed method, and %V2 uses the adaptive method. %V0
(default) disables this feature.
%V0
Disable automatic line-in-use detection.
%V1
Automatic Line Status Detection—Fixed Method.
Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2493 compares the
line voltage (via LVCS) to registers NOLN (U83) and LIUS (U84):
Loop Voltage
Action
0
LVCS NOLN
Report “NO LINE” and remain on-hook.
NOLN
LVCS LIUS
Report “LINE IN USE” and remain on-hook.
LIUS
LCVS
Go off-hook and establish a modem connection.
Once the call has begun, the off-hook intrusion algorithm (described in "4.15.2. Off-Hook Intrusion
Detection" on page 20) operates normally. In addition, the Si2493 will report “NO LINE” if the tele-
phone line is completely disconnected. If the HOI bit (U77, bit 11) is set, “LINE IN USE” is reported
upon intrusion.
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