SI2404-D-FT Silicon Laboratories Inc, SI2404-D-FT Datasheet - Page 33

• Manufacturer Part Number: SI2404-D-FT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2404-D-FT

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Command
%On
%O1
%O2
%Cn
%C0
%C1
%C2
%C3
%Vn
%V0
%V1
%B
%$
Display AT% command settings.
Report blacklist. See also S42 register.
Data compression
Disable V.42bis and MNP5 data compression
Enable V.42bis in transmit and receive paths. If MNP is selected (\N2), then %C1 enables
MNP5 in transmit and receive paths.
Enable V.42bis in transmit path only.
Enable V.42bis in receive path only.
Answer mode.
Si2457/34/15/04 will auto-answer a call in answer mode.
Si2457/34/15/04 will auto-answer a call in originate mode.
Automatic Line Status Detection.
After the %V1 and %V2 commands are issued, the Si2457/34/15/04 will automatically check the
telephone connection for whether or not a line is present. If a line is present, the Si2457/34/15/04
will automatically check if the line is already in use. Finally, the Si2457/34/15/04 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.
Disable automatic line-in-use detection.
Automatic Line Status Detection—Fixed Method.
Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2457/34/15/04 com-
pares the line voltage (via LVCS) to registers NOLN (U83) and LIUS (U84):
Loop Voltage
0  LVCS  NOLN
NOLN  LVCS  LIUS
LIUS  LCVS
Once the call has begun, the off-hook intrusion algorithm (described in "4.12.2. Off-Hook Intrusion
Detection" on page 19) operates normally. In addition, the Si2457/34/15/04 will report “NO LINE” if
the telephone line is completely disconnected. If the HOI bit (U77, bit 11) is set, “LINE IN USE” is
reported upon intrusion.
Table 10. Extended AT% Command Set (Command Defaults in Bold)
Action
Report “NO LINE” and remain on-hook.
Report “LINE IN USE” and remain on-hook.
Go off-hook and establish a modem connection.
Rev. 1.3
Action
Si2457/34/15/04
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