[time-nuts] Re: Ryzen mobos with serial port for Garmin GPS?

[Andy Talbot]

A bit more :
I think the serial interface, via an FTDI chip device, makes for one of te
most versatile interfaces you could go for.  Serial ports are supported in
every programming language so are generally easy to set up in software
without having to install DLLs.
The FTDI devices will run at up to 3000000 Baud, whereas the original
'real' RS232 was only ever 115200 baud max.
I have even used mine for 10 bit digitised audio at sampling-card rates
sent on  RS422 twisted pair .  It was simpler to programme than using a
soundcard would have been.

One FTDI device allows 8 bit parallel access that 'looks' to the PC like a
serial port.  Never tried this myself, but a number of manufacturers have
implemented PC interfaces using this route.

Andy
www.g4jnt.com



On Fri, 5 Nov 2021 at 18:32, Andy Talbot <andy.g4jnt at gmail.com> wrote:

> Use FTDI USB serial ports - you can't go wrong with them.
> https://ftdichip.com/
>
> I have, at the last count, used something like 200 of their FT232 device
> in one form or another on the shack PC.   I know that, because device
> manager has registered up to COM200.  Every time a new one is plugged in, a
> new COM port is set up.
>
> Andy
> www.g4jnt.com
>
>
>
> On Fri, 5 Nov 2021 at 18:26, Alec Teal <alec at unifiedmathematics.com>
> wrote:
>
>> A friend of mine who lives and breaths this stuff (I wont tell you what
>> he does - but suffice to say he's authoritative) basically said to me on
>> something about serial ports that you can't go wrong with USB stuff,
>> even on Linux.
>>
>> Would that work?
>>
>> Serial ports certainly are getting scarce! You'd get 2 to a board an
>> embarrassingly long time ago!
>>
>> On 05/11/2021 06:10, Darren Freeman wrote:
>> > On Thu, 2021-11-04 at 22:36 -0700, Rich Wales wrote:
>> >> However, mobos with a serial port are becoming harder to find.
>> > That's not really been my experience, they just moved it to a header.
>> > You will need to supply a DE9 to ribbon cable, say on a bracket, or
>> > installed in a cutout elsewhere in the case.
>> >
>> > This is the first one that I checked, and it has such a port labelled
>> > COMA, along the left/bottom edge.
>> > https://www.gigabyte.com/Motherboard/B450-AORUS-M-rev-1x/sp#sp
>> >
>> > Also note that the Linux PPS driver supports the standard PC parallel
>> > port, which you can usually find as a header. If you are having
>> > performance issues with one, try the other. (But you may need to supply
>> > negative-going edges to the parallel port.)
>> >
>> >
>> > Have fun,
>> > Darren
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