RS-485: Passive failsafe for an idle bus
Despite the integrated failsafe features of modern RS-485 transceivers, many applications use legacy parts lacking these features. Knowing how to provide failsafe operation, particularly during an idle-bus condition, therefore ranks at the top of the list of customer inquiries to interface application groups worldwide. This article shows how to apply failsafe biasing for idle buses externally and also suggests low-cost solutions that integrate this feature.
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