| 摘要 |
The present invention relates to a system for communicating with terminals (A, B) at remote locations (1), which uses the public telephone network (8, 7, 9) for communication between a central point and any terminal at any location. In order to set up the connection between the central point and any terminal via the public telephone network, the terminal can be connected to the telephone network through an intermediate gate circuit (4) installed at the location, in which gate circuit not only coding for the location, but also the telephone number of the central point is preprogrammed, and which gate circuit is opened when a start signal is transmitted by wireless means (11, 12, 13) from the central point (2) to the location (1). If terminals at other remote locations can be connected in a corresponding manner via the telephone network to one or more central points, a passive network is created. Central heating installations, deep-freeze installations, copying machines and the like can be quoted as possible applications. The application of the system according to the invention includes achieving savings in terms of preventive maintenance on the connected terminals.
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