Surveillance/alarm system asynchronous communications system having master/slave processor module driven transmitter/receivers first channel transmitting interrogation messages and response awaiting before second channel reception.

摘要

The asynchronous communication installation has a transmitter/receiver (6) driven by a processor module (7) operating in an interrogation mode on a channel (F1). The system hierarchical structure has a master station (1) and slave stations (2-5), with each transmit/receive module exchanging messages on a second channel (F2). After transmission interrogation each processor module waits for a set period for a proof of reception response message on the same channel , and changes channel if the proof is not received.