[time-nuts] Does the Thunderbolt have to be connected to a real serial port?

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Feb 20 19:55:29 UTC 2009


In message <499F09E5.4020300 at xs4all.nl>, "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
phk at FreeBSD.ORG         | 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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