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Thread: PIC Xmit to Serial Port
face picon face BY : Olin Lathrop email (remove spam text)

> If you are sending data DIRECTLY to the PC without using the MAX chip, you
> need to invert your data.  This is the only case that I'm aware of that
> need to do this.  I believe the reason for this is that the PC reads (-)
> values as "1" and (+) values as "0".

PCs conform to the RS-232 standard, which is inverted from the 0 to 5 volt
levels used by the PIC UART.  You need the same level conversion and
inversion whether you are connecting to a PC or any other "normal" RS-232
device.  The main difference between devices out there is that some will be
"terminal" equipment versus "computing" equipment and have RX/TX (and other
pairs) flipped.

Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, .....olinspamTakeThisOuTembedinc.com, http://www.embedinc.com

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<006b01c08549$19d4d7e0$260bf6cd@pc> 7bit

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