Communications system

摘要

A telemetry and control system is disclosed which allows a control office to communicate with a plurality of remote field stations over a preferably duplex communication channel. Transmissions, both controls and indications are formatted as messages comprising a number of words. The first word comprises the address of a selected field station to which the controls are, or have been, directed. A variable number of control words or indications and a check word or words conclude the message.