Another way to do it would be to edit the file normally in Vim and then
pipe its contents through the Unix command `head` in order to strip off
the final byte (i.e. the final newline). Since you're feeding it to
/dev/ttyS0, you could do something like this:
head -c -1 </path/to/text/file >/dev/ttyS0
Personally, I'd prefer this approach over the 'binary' hack required to
make Vim do what you want, since 'binary' has other (probably undesired)
effects besides enabling you to omit the final newline.
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