Compaq 1750 Armada 1700 Family of Personal Computers Reference Guide - Page 79

Guidelines for Using AT Commands You must follow certain rules when entering or using the AT command set. Read the topics in this section to learn more about these guidelines: Using the Attention Code You should precede all commands except A/ and +++ with the attention code AT. Entering a Command You can enter commands in uppercase or lowercase letters or a combination of both. However, always type the AT prefix in the same case (not At or aT). You can enter a maximum of 60 characters for the internal modem following the AT. The modem doesn't count the AT prefix, carriage return () character, or spaces. It counts, but doesn't act on, punctuation, such as hyphens and parentheses. You can enter telephone numbers with or without punctuation; for example: (123) 456-7890 or 1234567890 However, punctuation in the telephone number takes up space in the command buffer. If a command sequence exceeds the 60-character maximum, the modem does not execute any part of the command line and returns an error message after the instead. If this occurs, reentering the command within the 60-character limit allows the command line to be executed. Editing a Command If you make an error while typing a command, simply backspace over the mistake, then retype the line. You cannot backspace over the AT prefix because it is interpreted immediately after it is typed. Executing a Command After you enter an AT command, execute it with the Enter or character (selected in register S3). Using the Internal Modem 7-11