RS232 voltage levels (was PIC SBC requirement)
Dan Michaels email (remove spam text)
Chunhee Song wrote:
>I am always curious about the fact that logical 1 should be in between
>-5V to -15V and logical 0 should be in between +5V and +15V. Is there
>any important reason about that? My question might sound stupid. But why
>is this the other way around?
Probably because the first EEs were better at making inverters
than they were at making active pullup stages.
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