Moxa 8-port serial multiplexor, how-to

Doug Poland doug at
Tue Jul 28 12:08:47 UTC 2009

On Sat, July 25, 2009 01:46, Polytropon wrote:
> On Fri, 24 Jul 2009 10:32:52 -0500, "Doug Poland" <doug at>
> wrote:
>> After reading the handbook(26.2) and man puc(4), sio(4).  man sio(4)
>> talks about adding /boot/device.hints but not for my particular
>> hardware.  I'm at a loss on how to continue.
>> Suggestions, pointers, URLs welcome.
> The file is /boot/device.hints. For each serial port, the
> following dataset has to be completed:
> 	hint.sio.<N>.at="isa"
> 	hint.sio.<N>.port="0x3F8"	<---+
> 	hint.sio.<N>.flags="0x10"	<---+--- set up
> 	hint.sio.<N>.irq="4"		<---+
> Still, I don't know how to determine the correct addresses
> and IRQs, maybe the documentation belonging to the expansion
> card can help...
Yeah, their product manual(PDF) doesn't help with this type of
information.  I'll email them and see if they can give me these data.

> If I see this correctly, each serial port should then be
> visible as a /dev/cuad<N> device file.
Thanks for your help.


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