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How is half-duplex communication possible, when two instruments in a segment want to send data simultaneously in opposite directions?

April 26, 2017communication Data directions half-duplex instruments opposite possible segment send simultaneously

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How is half-duplex communication possible, when two instruments in a segment want to send data simultaneously in opposite directions?

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The rules for access to the bus prevent two devices ever transmitting at the same time. Even when two devices have something to say, they must each wait until they are asked for a specific item of data, or receive the token from the LAS to allow an unscheduled message.