On Tue, 11 Jul 2000, Russell Farnhill wrote:

> I thought that a MAX232 chip or similar was needed to send 5v serial data
> to a PC. Is this just a fluke or am I missing something here ?

Adam's response is exactly right.  I looked at the specs for the old 1489
line receiver as well as the MAS232.  The worst case I found was the 1489
which still sees anything below 0.65V as a low.  The MAX232 and its
variants' input threshold is more like 1.4 - 1.8V.  You just have to
invert the data you send toand receive from  the PC, since the line
drivers/receivers invert data.

Dale
---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
                -- Isaac Asimov

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