DEVICE CONTROL SYSTEM

摘要

DEVICE CONTROL SYSTEM The disclosed control system employs an existing stored program PBX to regulate the operation of devices located at one of a plurality of sites in accordance with one or more modes of operation as offered by an algorithm stored in the PBX memory Each site is equipped with a control circuit to regulate the operation of the devices located at the site. These control circuits are activated by the presence of an audio frequency on the telephone line associated with each site. To minimize the impact of this scheme on the traffic capacity of the PBX time division switching network, all activated control circuits are concurrently connected to a single time slot, which supplies the required audio frequency.