1.Open Start 
2.Select the desired modem (Windows 2000: on the "Modems" page).
3.Click the Properties button.
4.On the Settings page, click the Advanced... button (Windows 2000: Advanced Options page).
5.Enter the AT command in the Extra Settings field.
If you want to set more than one register, separate each individual register with semicolons followed by a space. Only the first command entered requires the prefix ”AT”.
Example: AT S31=2; S35=38400; S51=0
6.Confirm your entries by clicking OK and close the modem window.
| AT Command | Value | Parameter | 
| 
 | 
 | 
 | 
| ATS0= | 0 | 0=AUTOANSWER off | 
| 
 | 
 | (default) | 
| 
 | 
 | 
 | 
| 
 | 1 | 1=AUTOANSWER on | 
| 
 | 
 | 
 | 
| ATS2= | 43 | ASCII code for escape | 
| 
 | 
 | sequence character | 
| 
 | 
 | 
 | 
| ATS3= | 13 | Code for CR | 
| 
 | 
 | 
 | 
| ATS4= | 10 | Code for LF | 
| 
 | 
 | 
 | 
| ATS5= | 8 | Code for BS | 
| 
 | 
 | 
 | 
| ATS12= | 100 | Time interval for escape | 
| 
 | 
 | sequence | 
| 
 | 
 | 
 | 
| ATS30= | 
 | Error Level: | 
| 
 | 
 | 
 | 
| 
 | 0 | No AT command; syntax, | 
| 
 | 
 | illegal register value, | 
| 
 | 
 | command not executed | 
| 
 | 
 | 
 | 
| 
 | 1 | Unknown command | 
| 
 | 
 | parameter | 
| 
 | 
 | 
 | 
| 
 | 2 | Unknown command | 
| 
 | 
 | 
 | 
| ATS31= | 0 | Protocol: X.75 (default) | 
| 
 | 
 | 
 | 
| 
 | 1 | Protocol: HDLC | 
| 
 | 
 | 
 | 
| 
 | 2 | Protocol: V.110 | 
| 
 | 
 | 
 | 
| 
 | 3 | Fax Group 3 | 
| 
 | 
 | 
 | 
| 
 | 4 | Protocol: TEL | 
| 
 | 
 | 
 | 
| 
 | 5 | Protocol: X.25 | 
| 
 | 
 | 
 | 
13. ISDN CAPI Port Device Driver 203
