Inventors:
Arthur F. Goldsby - Morrison CO
Frank J. Haberl - Denver CO
Satish K. Anand - Golden CO
Assignee:
Martin Marietta Corporation - Bethesda MD
International Classification:
H04Q 900
G08B 2500
Abstract:
This invention relates to a system for monitoring the condition and operation of remotely located machines, such as coin-operated vending machines. In one embodiment, switches in each machine convert operating conditions into a binary digital word for that machine, which is stored temporarily. Such words for a plurality of machines are then transferred to a memory, whence they are retrieved, coded as to machine number and transmitted via telephone line to a control processing unit where the various machine conditions are recorded and displayed.