Compaq 1700 Armada 1700 Family of Personal Computers Reference Guide - Page 80

Interpreting a Missing Parameter If you enter a command that normally includes a numeric parameter (such as ATHn) without the numeric parameter, the modem interprets the missing parameter as zero. For example, the Hn (hang-up) command can have a numeric parameter of zero (H0) or of one (H1); however, if the parameter is missing, ATH is the equivalent of ATH0. This rule applies to command parameters only, not to dial strings. Entering an Escape Code Sequence The escape code sequence (a 3-character code surrounded by escape guard times) forces the modem from the online mode to the command mode. You must enter the escape character three times consecutively, and the delay between entering each escape character must not exceed the escape guard time. After a short delay, the modem responds with the OK result code to let you know that it has successfully "escaped" to the command mode. Use the ATO command to return to the online mode. The escape guard time is defined as the time delay required between the last character transmitted and the first character of the escape code. The default escape character (set in register S2) is +, the default escape guard time (set in register S12) is one second, and the default escape code sequence is +++. Repeating a Command You can repeat the last command line issued by entering the A/ command. This action also repeats the AT prefix and the ; therefore, you are not required to enter the AT prefix or a when using this command. Each string command remains in the command buffer until an AT is entered or power to the modem is turned off. Both actions clear the buffer and make the A/ command invalid, since there is no command for the modem to repeat. 7-12 Using the Internal Modem