For your modem to	Command
Display a four-digit product code.	ATI0
Perform a checksum of the modem’s read-only memory (ROM) and display the results. (This function is used only in factory testing.) The Courier 56K Business Modem should always display the same number unless the flash has been updated.	ATI1
Perform a test of the modem’s random-access memory (RAM) and display either OK (0) or ERROR (4), followed by OK when the test is completed. You may want to use this command if the Courier 56K Business Modem appears to be malfunctioning.	ATI2
Display the Courier 56K Business Modem’s banner or product title.	ATI3
Display the Courier 56K Business Modem’s current configuration.	ATI4
Display the configuration saved in nonvolatile random access memory (NVRAM). If your Courier 56K Business Modem connects to a device that has Dial Security and local access enabled, you cannot view the stored phone numbers.	ATI5
Display a diagnostic summary. During a connection, the Courier 56K Business Modem monitors and stores information about link operations. When the call is ended, you can request a diagnostic summary. The duration of the last call or the real time is displayed, depending on the modem clock setting. For calls under data compression, the number of characters sent may be less than the number of octets sent, due to data compression operations.	ATI6
Display the product configuration.	ATI7
Lists phone numbers with redial instructions.	ATI8
Displays modem’s Plug and Play ID.	ATI9
Display the Dial Security Account Status. For security administrators only, unless local security is disabled (S53=0 or S53.2=0)	ATI10
Display a connection report that U.S. Robotics Technical Support representatives use to help you solve problems.	ATI11
Display caller ID information from the current call (if in progress) or the last call (if between calls). The caller ID information remains until either the modem is reset or until the modem receives another valid caller ID signal.	ATI15
Display a connection report that U.S. Robotics Technical Support representatives use to help you solve problems.	ATI16
Display a connection report that U.S. Robotics Technical Support representatives use to help you solve problems.	ATI17

Displaying Help

The Courier 56K Business Modem provides seven Help, or command summary, screens: basic AT command set, ampersand (&) command set, percent (%) command set, dial command options (D), S-Registers (S), the octothorpe (#) command set, and the +P command set.

Note: Help screens are not available when a modem makes a synchronous connection using &M6 or &M7.

For your modem to display	Command
A partial summary of the basic command set	AT$
A partial summary of the ampersand command set	AT&$
A partial summary of S-Register functions	ATS$
A partial summary of percent command set	AT%$
A summary of the octothorpe command set	AT#$
Help screen for dial commands	ATD$
Help screen for V.92 commands	AT+P$

Note: To see the remainder of the screen for any given command, press any key.

Contents:

Appendixes

Courier 56K Business Modem Command Reference

Displaying Querying and Help Screens

Overview

Querying

Displaying Help