ATI modem diagnostic information

Updated: 11/13/2018 by Computer Hope

External computer modemATI commands help list additional information about the modem, and in diagnostic situations can help determine if the modem is properly working. To get this information and get to the diagnostic screen, follow these steps for your operating system.

Windows ME, 2000, XP, Vista, 7 users

  1. Open Device Manager.
  2. In Device Manager click the + next to Modems.
  3. Double-click the Modem listed.
  4. Click the Diagnostics tab.
  5. Click the Query Modem button. Responses from the modem are returned. See the following section for additional information about each of the ATI commands.

Windows 95 and 98 users

  1. Open Control Panel.
  2. Double-click the Modems icon.
  3. Click the Diagnostics tab.
  4. Highlight the port that the modem is listed on and clicking on the More info button. The more info should return a series of responses from the modem See the following section for additional information about each of the ATI commands.

Additional information about the returned ATI commands

ATI0 - Return product code.
ATI1 - Return memory (ROM) checksum.
ATI2 - Run memory (RAM) test.
ATI3 - Return call duration/real time.
ATI4 - Return current modem settings.
ATI5 - Return NVRAM settings.
ATI6 - Return link diagnostics.
ATI7 - Return product configuration.

Additional information