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Switching signals in this range is possible only with power supplies that cover this range.
The range from −7 V to 12 V is the range that the receiver can accept, but this is not necessarily the range of the voltages that actually occur on the bus. When you have a 5 V driver, the bus voltages will be between 0 V and 5 V.
Is it possible that there is a ground shift between the RS-422 driver and the switch? If yes, how large?
