Specifications

Si2457/Si2434/Si2415

30 Rev. 0.91

&X1

Automatic determination of telephone line type.

Result code: WXYZn

W: 0 = line supports DTMF dialing.

1 = line is pulse dial only.

X: 0 = line supports 20 pps dialing.

1 = line supports 10 pps dialing only.

Y: 0 = extension network present (PBX).

1 = outside line (PSTN) connected directly.

Z: 0 = continuous dialtone.

1 = make-break dialtone.

n: 0–9 (number required for outside line if Y = 0).

Note: The initial number attempted for an outside line is controlled in S51.

&X2

Same as &X1, but Y result (PBX) is not tested.

Y2A

Produce a constant answer tone (ITU-T) and return to command mode. The answer tone continues

until the ATH command is received or the S7 timer expires.

Enter low-power wake-on-ring mode.

Table 11. 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 Si2457/34/15 will auto-answer a call in answer mode.

%O2 Si2457/34/15 will auto-answer a call in originate mode.

%Vn Automatic Line Status Detection.

After the %V1 and %V2 commands are issued, the Si2457/34/15 will automatically check the tele-

phone connection for whether or not a line is present. If a line is present, the Si2457/34/15 will auto-

matically check if the line is already in use. Finally, the Si2457/34/15 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.

Table 10. Extended AT& Command Set (Command Defaults in Bold) (Continued)

Command Action