Method of transmitting measuring values in a monitoring system

• US 4,612,534 A
• Filed: 04/19/1983
• Issued: 09/16/1986
• Est. Priority Date: 04/28/1982
• Status: Expired due to Fees

• Current Assignee: Cerberus ABP Investor LLC (Cerberus Capital Management LP)
• Original Assignee: Cerberus ABP Investor LLC (Cerberus Capital Management LP)
• Inventors: Scheidweiler, Andreas, Muggli, Jurg, Buehler, Richard, Schibli, Eugen
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US06/494,966
• Time in Patent Office: 1,246 Days
• Field of Search: 340/505, 340/508, 340/518, 340/531, 340/825.05-825.13, 340/825.15, 340/825.5, 340/511, 340/825.54, 340/825.52
• US Class Current: 340/505
• CPC Class Codes: G08B 26/005 with substations connected in series, e.g. cascade
• CPC Class Codes: G08B 29/24 Self-calibration, e.g. compensating for environmental drift or ageing of components

Abstract

Measuring stations or locations are connected in cascade to signal lines and transmit measured or measuring values to a central signal station at which the measured values are linked or appropriately processed so as to obtain distinct malfunction or alarm signals. Upon activation of the monitoring system all measuring stations are disconnected by a change in voltage appearing on the signal line. Then, the measuring stations are reconnected to the signal line in a timewise staggered fashion by means of switching elements present at each measuring station in such a manner that each measuring station additionally reconnects a subsequent measuring station to the line voltage after a predetermined time-delay. Address storages are present at the measuring stations and are charged or occupied in a predetermined sequence by the central signal station with addresses associated with the individual measuring stations. The address storages are thereafter locked prior to the time that the next following measuring station at the same signal line is connected to the signal voltage by the switching element.

Claims

1. In a method of transmitting measured values in a monitoring system containing individual measuring stations cascade connected by signal lines to a central signal station, each measuring station containing at least one switching element and at least one address storage, comprising the steps of:

(a) applying a voltage to said signal lines in order to disconnect all of the measuring stations from said signal lines;

(b) charging the address storage of a predetermined one of said measuring stations with a predetermined address by means of said central signal station;

(c) closing the switching element of said predetermined one of said measuring stations in order to lock said charged address in the address storage of said predetermined one of the measuring stations and to connect a following measuring station with said central signal station; and

(d) repeating the foregoing steps (b) and (c) for successive ones of said measuring stations until said successive ones of the measuring stations are charged with predetermined addresses.

2. In a method of transmitting measured values in a monitoring system containing individual monitoring measuring stations cascade connected via signal lines to a first pair of terminals of a central signal station, each measuring station being provided with at least one switching element and at least one address storage, comprising the steps of:

applying a voltage signal to the signal lines in order to disconnect all of the measuring stations from the central signal station;

applying by means of said central signal station in a timewise staggered succession respective predetermined addresses to said measuring stations by respectively infeeding said predetermined addresses into the respective address storages of said measuring stations; and

blocking the applied address in each address storage before a next following measuring station is reconnected with the signal lines.

3. The method as defined in claim 2, wherein:

the step of blocking the applied address in each address storage entails actuating the switching element of the measuring station where the address is to be blocked in the address storage thereof.

4. The method as defined in claim 3, further including the step of:

utilizing closing of the switching element of any predetermined one of said measuring stations in order to block the address stored in the address storage thereof and to reconnect the next following measuring station with the signal lines.

5. The method as defined in claim 2, further including the step of:

initially charging that one of said address storages associated with that one of said measuring stations which is located closest to said central signal station.

6. The method as defined in claim 2, further including the step of:

initially charging that one of said address storages associated with that one of said measuring stations which is located furthest from said central signal station.

7. The method as defined in claim 2, further including the step of:

directionally symmetrically connecting said measuring stations to said signal lines.

8. The method as defined in claim 7, further including the steps of:

connecting the signal lines extending from a last one of said measuring stations to a second pair of terminals; and

selectively activating said measuring stations via said central signal station either via said first or via said second pairs of terminals.

9. The method as defined in claim 2, further including the step of:

after charging all said address storages associated with all said measuring stations closing all said switching elements in order to connect all said measuring stations in parallel to said central signal station.

10. The method as defined in claim 2, further including the step of:

incorporating in each of said measuring stations control means for detecting a short-circuit in pairs of terminals of each said measuring station and to which said measuring stations are connected via said signal lines.