HP pavilion xh500 Manuale Di Servizio

 

Specifications and Regulatory Information 

 

Modem Reference Information 

  

Reference 

Guide 

123 

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 Phone and Modem Options in 
Control Panel, from most communications software, or by using terminal mode in your 
software. See “To change your modem settings” on page 62. 

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 

L3 

Set high speaker volume