In message <[email protected]>, "S. Nestra" writes:

Quite a lot of USB-serial adapters cheat at various levels.

The worst output 0/+5V or +/-2.5V  either of which are totally outside the
spec at the receiving end.

The acceptable output +/-5V, which i out of spec for a transmitter, but
inside spec for a receiver, so a short or no cable, it works fine.

The good output +/-9V or more as the spec requires.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
[email protected]         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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