[Soekris] 2 [serial port/LCD] questions about the net4501
phk at phk.freebsd.dk
Sat Aug 14 13:54:19 UTC 2004
In message <Pine.BSI.3.91.1040814054205.8612A-100000 at spsystems.net>, Henry Spen
>On Sat, 14 Aug 2004, Poul-Henning Kamp wrote:
>> >...There are serial-powered gadgets which will work with even a
>> >worst-case RS232 line.
>> And there are RS232 lines which do not provide enough power for even
>> these very smart devices...
>Another small correction :-): there are lines which *claim* to be RS232
>which don't provide enough power for the carefully-designed gadgets.
>RS232 does specify minimum values of voltage and current available.
RS232 and I go back 25 years, lets not even get started about what
is according to spec and what isn't.
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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