| 摘要 |
A portable emergency-indicating apparatus 5, which enables an operator to intercommunicate with a fixedly arranged security-ensuring apparatus 2 of an alarm system, indicates an emergency upon the receipt of an emergency-information signal from the fixed apparatus 2. The portable apparatus 5 may interrogate the fixed apparatus 2 for this purpose, in response to operation of the portable apparatus by an operator, e.g. a controller of the alarm system. <IMAGE> |
