SI2493-D-FS Silicon Laboratories Inc, SI2493-D-FS Datasheet - Page 80

• Manufacturer Part Number: SI2493-D-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-D-FS

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

AN93
80
Command
%Cn
%C0
%C1
%C2
%C3
%On
%O1
%O2
%Vn
%V0
%V1
%B
%$
Display AT% command settings (see text for details).
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), %C1 enables MNP5 in transmit and receive paths.
Enable V.42bis in transmit path only.
Enable V.42bis in receive path only.
Answer mode.
ISOmodem answers a call in answer mode.
ISOmodem answers a call in originate mode.
Automatic Line Status Detection.
After the %V1 and %V2 commands are issued, the ISOmodem automatically checks the telephone
connection for whether a line is present. If a line is present, the ISOmodem automatically checks if
the line is already in use. Finally, the ISOmodem checks 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 ISOmodem compares
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 "6.6.2. Off-Hook Condition"
on page 162) operates normally. In addition, the ISOmodem reports NO LINE if the line is com-
pletely disconnected. If the HOI bit (U77, bit 11) is set, LINE IN USE is reported upon intrusion.
Table 41. Extended AT% Command Set
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