SI3015-F-FS View Datasheet(PDF) - Silicon Laboratories
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SI3015-F-FS Datasheet PDF : 68 Pages
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Si2403
Table 10. Extended AT% Command Set (Command Defaults in Bold)
Command
Action
%$
%B
%On
%O1
%O2
%Vn
%V0
%V1
Display AT% command settings.
Report blacklist. See also S42 register.
Answer mode
Si2403 will auto-answer a call in answer mode
Si2403 will auto-answer a call in originate mode
Automatic Line Status Detection.
After the %V1 and %V2 commands are issued, the Si2403 will automatically check the telephone
connection for whether or not a line is present. If a line is present, the Si2403 will automatically
check if the line is already in use. Finally, the Si2403 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 Si2403 compares the
line voltage (via LVCS) to registers NOLN (U83) and LIUS (U84):
Loop Voltage Action
0 ≤ LVCS ≤ NOLNReport “NO LINE” and remain on-hook.
NOLN ≤ LVCS ≤ LIUSReport “LINE IN USE” and remain on-hook.
LIUS ≤ LCVS Go off-hook and establish a modem connection.
%V2
Once the call has begun, the off-hook intrusion algorithm (described in "Off-Hook Intrusion Detec-
tion" on page 18) operates normally. In addition, the Si2403 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.
Automatic Line Status Detection - Adaptive Method.
Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2403 compares the
line voltage (via LVCS) to the NLIU (U85) register:
Loop Voltage Action
0 ≤ LVCS ≤ (0.0625 x NLIU)Report “NO LINE” and remain on-hook.
(0.0625 x NLIU) < LVCS ≤ (0.85 x NLIU)Report “LINE IN USE” and remain on-hook.
(0.85 x NLIU) < LCVSGo off-hook and establish a modem connection.
The NLIU register is updated every 1 ms with the minimum non-zero value of LVCS in the last
30 ms. This allows the Si2403 to eliminate errors due to 50/60 Hz interference and also adapt to rel-
atively slow change in the on-hook dc reference value on the telephone line. This algorithm does not
allow any non-zero values for NLIU below 0x0007. The host may also initialize NLIU prior to issuing
the %V2 command. Once the call has begun, the off-hook intrusion algorithm (described in "Off-
Hook Intrusion Detection" on page 18) operates normally. In addition, the Si2403 will report “NO
LINE” if the telephone line is completely disconnected. If the HOI (U77, bit 11) bit is set, “LINE IN
USE” is reported upon intrusion.
28
Rev. 1.2
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