Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1979-12-17
1981-12-22
Trafton, David L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340642, 340762, G06F 314, G08B 522
Patent
active
043073921
ABSTRACT:
A scale is disclosed which includes a digital display unit for conveying information. A display verification method and system are employed for determining whether a plurality of information conveying segments forming the indicators of the display unit are properly conveying information. Individual segments of the display unit are operated under control of a microprocessor. Segment status determining circuitry determines the operative status of each of the segments by sequentially monitoring a voltage drop indicative of the current passing through an LED comprising that segment. The status determining circuitry produces status information which is stored in the microprocessor memory and compared with data indicative of the information the display should convey if it is properly functioning. If the comparison indicates that one of the segments is not properly conveying the information, warning messages are displayed which indicate maintenance procedures are required. If all segments are correctly displaying information, the verification procedure is repeated.
REFERENCES:
patent: 3753226 (1973-08-01), Schnurmann et al.
patent: 3866171 (1975-02-01), Loshbough
patent: 3943500 (1976-03-01), Buchanan
patent: 4188625 (1980-02-01), Hodemaekers
Loshbough Richard C.
Pryor Edward G.
Reliance Electric Co.
Trafton David L.
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