Brief description of the detection of a sequence of an internal-combustion engine for the passage of a modem of a mode of transmission of data has a control mode, and the modem made for óoeuvre of the process.

摘要

Method for detecting an escape sequence for passing a modem (1) from the "on line" mode to the "command" mode, the sequence comprising first characters (+++) followed by a silence and each control instruction being preceded by a second predetermined set of characters (AT), the method being characterized by the following iteratives steps: (a) storing temporarily in memory (14), in succession but without taking into account the time, the last M characters received by the modem from the host computer; (b) detecting if said memory contains contiguously the first and second characters; (c) if not, the modem is left in the "on line" mode; (d) if it does, detecting if, in the N characters which follow the first and second contiguous characters, there is an end of instruction code (CR), N being smaller than M; (e) if not, the modem is left in the "on line" mode; (f) if there is, switching to the "command" mode is enabled. .