Reference Information
Modem Reference Information
Reference Guide 147
Modem Reference Information
If your computer has a modem port, you can customize the operation of the modem using
AT commands and S-registers. You can do this from Modem (Windows 98) or Phone
and Modem Options (Windows 2000 and XP) in Control Panel, from most
communications software, or by using terminal mode in your software. See “To change
your modem settings” on page 63.
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. Your computer has either a 3Com/US
Robotics or Ambit (ESS) modem. To determine which brand is in your computer:
• Open Modems (Windows 98) or Phone and Modem Options (Windows 2000 or XP)
in Control Panel.
Modem Reference (Ambit)
In the following AT command table, default settings are shown in bold. All listed AT
commands except A/ must be preceded by “AT.”
AT Commands (Ambit)
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
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