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Thread: RS232 voltage levels (was PIC SBC requirement)
www.piclist.com/techref/microchip/ios.htm?key=rs232
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face BY : Dan Michaels email (remove spam text)



Chunhee Song wrote:
>Hello,
>
>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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