Abstract: A communications adaptor for a remote action terminal connected to a telephone line in parallel with a telephone set in order to interchange remote action data with at least one server via the telephone line and a remote action network to which the server is connected, the data being interchanged using a frequency band different from that used by the signals relating to the telephone set, the adaptor including a binary data transmitter/receiver operating by frequency shift keying between two frequencies and the remote action network likewise including a binary data transmitter/receiver operating by frequency shift keying between the same two frequencies, dialog taking place in alternation between the transmitter/receivers by interchange of signals. The adaptor also includes a remote signalling device provided with means for causing signalling to be transmitted by the adaptor indicating that an absence of dialog has been observed for longer than a predetermined period of time.

Abstract: A power supply switchover device is provided for electrical apparatus such as teleaction terminal equipment. A switching circuit puts a storage battery into and out of use by connecting it to at least one supply terminal of the electrical apparatus to which another source is also connected. A control circuit causes the switching circuit to connect the storage battery when the supply terminal falls to a predetermined potential as furnished by the power supply, and a blocking circuit acts on the control circuit to initiate disconnection of the storage battery, when and as long as said terminal is at a potential that is lower than a determined threshold value.