In the past, the automatic charging device could not provide the function of communication, network management and automatic dialing.

Aiming at the function of auto-dial in designing telephone set, Single chip microcomputer is used in auto-recognizing audio signal of telephone The theory is put forward The interface circuit and the software are designed A good effect can be obtained The problem of realizing the function is solve

Realization of multi-temperature monitoring and automatically dialing voice alarm system;

This paper introduces the design of multi-temperature supervised and automatically dialing voice alarm system,and detailed clarifies the relevant work principle,the key technique and hardware designs.

This system utilizes telephone network and modem to transmit files between long-range computers by autodial.

It accesses a server with autodial and depends on INET control to transfer files, then it can automatically hang up after completion.