Specifications and Regulatory Information
Modem Reference Information
136 Reference Guide
Modem Reference Information
If your computer has a built-in modem, you can customize the operation of the modem
using AT commands and S-registers. You can do this from Modem (Windows 98 or
Windows ME) or Phone and Modem Options (Windows 2000) in Control Panel, from
most communications software, or by using terminal mode in your software. See “To
change your modem settings” on page 61.
Note
You should have a good understanding of modems and how they operate before you
change default settings.
This section contains summary information about AT commands, S-registers, and selected
result codes for the built-in modem (with an Ambit chip), which is included with selected
models of the HP notebook PC.
AT Commands (Ambit)
In the following AT command table, default settings are shown in bold. All listed AT
commands except A/ must be preceded by “AT.”
Command Function (Ambit)
A/ Re-execute command (not preceded by AT)
A Go off-hook and attempt to answer a call
B0 Select V.22 connect @1200 bps
B1 Select Bell 212A connect @1200 bps
C1 Return OK message
Dn Dial modifier
E0 Turn off command echo
E1 Turn on command echo
H0 Initiate a hang-up sequence
H1 If on-hook, go off-hook and enter command mode
I0 Report product code
I1 Report pre-computed checksum
I2 Report “OK” if the calculated checksum equals the prestored checksum or if the prestored checksum value
is FFh
I3 Report firmware revision, model, and interface type
I4 Report response programmed by OEM
I5 Report the country code parameter
I6 Report modem data pump model and code revision
I7 Report the DAA code
L0 Set low speaker volume
L1
Set low speaker volume
L2 Set medium speaker volume
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